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习题练习:Physics Unit2: Kinematics One Dimensional Motion

 作者: physics   总分: 98分  得分: _____________

答题人: 游客未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels from one point in space to another. Make a c;drpx*xd5z z3y bpu 95omparison between 9rd;5z p yx*zx5 d3pubthe displacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average i 18m6 5tzdw frtq(6bsvelocity of an object equal to the instantaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises that their caro /qes83 qoitd9p )* vgokrtfg 91-zi* can go "from zero to sixty in 8 s". This is a descriptiono 3q*g8gt/ o19ziktqs fv-)dre *op9 i of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x q0fwjywl-*duex+3.4oyjt v2axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car travelinzt(dcoi.ih ws4cq8jcwy 9 1;+ g to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its8s(;1 z c oq4c+i.jdwwiy9tch acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the West (-x directipg/ iut gd;mule, z+*,on) begins to slow down as it approaches a traffic light. Make a statement concerning its accu,d/t m*, l;iegg+ zupeleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a cons rwnu.sp582du(s(t xltant velocity. Make a statement concerning its acwr.nuxs(( dutlp 58s2celeration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, does.q/z/x xjj pq; it mean that the acceleration is zero? Support your answer with an examplpj/ ./qx;qxjz e.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velocity y4qo go7j;z 7uu7d)olchange direction when its acceleration is constant? Support your answer with an u7l)4o7o joqz7 yud;gexample.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is mo 0dgc5f6.hjkyn) or;iae-,feving with constant acceleration. Make a statement concerning its motion wi; fde,r0nke.y5 )cio a-gjhf6th respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its acceleration is decreasing?hp(whn m45+ )m6 urzwu Suppo5r64zum)wpu hh+ n(wmrt your answer with an example.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up along a smo-19gfckfqd .mw/20wct phr o: oth hill of ice. Make a statement concerning its accegk2hf :prmww.qt1 c 9co- fd/0leration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is a;8lej un85f m: .nvf)fxjwy()ace*wkverage velocity equal to the average of the object's initial and final vel wn: (cmnjx *)v5 uef.y;ewkfa)8f jl8ocity?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start at c9 *-q vepgzl8rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object Bg zqc*98ev-pl . What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from rest. They botwha*zfzu nc):;)w 8ych accelerate at the same rate. However, object A accelerates for twice the time az);ac w:w*z y8hcn)fu s object B. What is the distance traveled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is ree:l, :4wexe6e v 96izjsayh 89j8wk 4ifsn*evleased from rest and falls in the absence of friction, which of t*ysv8vwhx9s8z: e ee: w4 ,je6if jien6ak4l 9he following is true concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from restko-b m.xe ph+/ and falls in the absence of friction, which of the following is true concerning it +epb omk-xh/.s motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statement/c+xytw) bl .f fv)4bt about the velocity and the acceleration b)y+c 4v fflt)/xbt.w when the ball reaches the highest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleration just be.ik3bvjhqkg+qidrp,k0w c t64c7 6b -fore it reaches its highest p-q 7qt k .r w+06ki6hpibc,kd3cgj4bvoint?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight uuo j ks2p; c+.u2f3;mn:vn2cduyn i9 ;6pvuhsp, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accuoum2pv vn:.icp yn sf;9suud;nh2 c6 ;+k j32eleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maximum heigmit u)r1)imaoqzc q55(o0xu1 ht, then falls to its initial height. Make a statement about the direction of the veloci ()5um1i1 tooqz ra5mxu0)c qity and acceleration as the ball is coming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in the absence of air resistance. Makn;0rywdh c8 7ve a statement concc nw78h0vyr; derning its acceleration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying plaj(tguzuclvr5a3s74 eh.gn+ 5ne. What is her acceleration when 7 g5+.ujerlvgt3 ahs4(5 zucnshe she reaches terminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. An identical second ballp. q;delyted(hj (zx4q -ef) v3zx-25 e/xu kd is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximu thz xp l edk54qq) ;x(-jvfx/eyd dzee2u(3-.m height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from 4zz5hnii- pp -y.s,iy the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance betweeyz n-i ipy,-i4hzps5.n them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second later, ball B 53e/c pwy8vos noz6+cis dropped from 8v+ n3cz/6oswp5 oycethe same building. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building. One is tkjz; a53 h4geg /2evskhrown up, and the other is thrown down, both wi5ks4je3zgv/ahk2 e ;gth the same initial speed. What are their speeds when they hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from the top of a building eak5 3zp l-wq;qz2c :jzz,,ty. A second brick is thrown straight down from the same building. They are released at the sp q c; 5wzt ey:kzaz2zl-,3q,jame time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +xgmp2l1,w q8lk :g)qw)cwtt;o axis. The position)qopl,q 2;1 wtwk8wtg)gml : c versus time graph of this object is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero accelerat:cq2)hdn 54c cg0owus ion in the +x axis. The position versus time graph ofdgs cn: u2)54cw ch0oq this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving wi 4w k/out,2qvnth constant non-zero velocity in the +x axis. The velocity versus time graph of th/nkt4 ,ov2wu qis object is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the +x axis. The vew +lnb * )3b 0w-g(kbkekpa6odlocity versus time g- o3w6akd*w b )nbe+bg0lk p(kraph of this object is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position versc/wrhgr d ylyy+g9cbg51:fu9y8w:c ( us time graph gives

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity versus time graph givx0 k1/qwd0mfr 7qe o7hes

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an accelp sd6 e (pqovc:(.:tqceration versus time graph gives

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve :a;wxv(j n*onek*ph )in a velocity versus time graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph ofm655kb iodel p g0(bw+ an object is a horizontal line, the object ibp055om6 ib+ ldgwek(s

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a verticka( s-9cz 7ypdb9ybm2tv( s6ial line, the object isvmspb7b 9(yt2(za ys d6k9c i-

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a he7yw8ck;rfy rxa:n x s9owc,p-/ss8(orizontal line, the object ws7xe/nfocwx98 skp yr ,-rcasy8 (; :is

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus timsufy83mk m. 9ee graph of an object is a straight line making an angle of 30 degrees wifky.9 8meus m3th the time axis, the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 11.0 mw k2qlgzv /;-r6uy;y lz) 4izx south. Find both the distance traveled and the m-g6;z kz4 ;iwul yvyq)/2rzxlagnitude of the displacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still water. How long will it take to move 12 hl+g8 v ,afuci *n8dp(km upstream in a riverp*higdcu8( na+, fl8 v flowing 6.0 km/h?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s? (1 mi = 1609f 7k0r1erx0oav*v:o n m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your average speed in order to travel 350 yh g.3ub,3bhokm in 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (ak c6h2krpu89npproximately 42.0 km) in 2 hours and 57 min. What is the averag 6cr kh9k2n8pue speed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. Ho lkv+ufey /h md ao:h0+eoe):;w long does it take for it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that light travels in one yjq7 yy,2 a9. vdeh) 2ilufed*zl2kbuhv*. s;pear. The speed of light is 3.00 x 2zy7 ;ak9 ilp*f dld)h., v*2q2ujv ebhy e.su108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight roaa(dc*aa 2.7x rg w vynt-8q2efd and you look to the side for 4.0 s, ho2aae( 7nfxyt8v.r-d q2wca *gw far do you travel during this inattentive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor track (400 m), iqau q,;g ;myd1n 100 s, your average veloci1;yamd g,;q uqty is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south2 q3r(ol/y 4zgjyjr x3 mfu93x, then 1.0 km east, then 1.0 km north, then 1.0 km west to94 gf/jjyqom xrl( u zr333y2x return to its starting point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North eex4 jowq5th8x6bjhz- 2- w. cPole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to itswtbj8o25ewhxc-xq 4- . ze6hj starting point. This trip takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a d97kea8x3 hcz weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your home 73cxdaz98ehktown from school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 j +.hn*b1 degfkm/h and 160 km at 100 km/h. What is the average speed of the motorist for this tr.jg1d*n +fbehip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her zu(1vj0 8hovz average speed for the th18ozz u(v 0vjrip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 3006b2q6-y oiftgn* vw0k mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. - nqykb20g*i tvwo6 f6What is the average speed for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorman (the person who runs the lay23lhg8.lx of st 100 m) for teayxoh gf .l2l38m A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates uniformly and comes to a stop after 10 s. The car's average7y204 eat -lykt i5kec velocity during decelerat2y5 ikec07 yeklt 4ta-ion was 50 km/h. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s tot 4rcee j.fra0t0 ;:twdr*w ;r 160 m/s, at the average rate of ;w.0jtc*;wr:dtr fatr er04 e $15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h accelerates hr1/d gond83iou gj*es ,3,z 1ytxo 5fat the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from rest an+ p5r5w d(n4t .cwsfyoxx b/e-d accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then speeds up with a c3ehku(zm(j:ct* / wk/vb:h wqonstant acceleration of (vwhmhkc eu /k3(wz:jtq b*/:$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 5.0 m/s experiences a constant accel v-8b slidwyfh7hl+,*eration ohi8vhls-dl 7yw* fb, +f $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizu.j1 ing(bz udh( s)*tontally to the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a d)1sb(u(zdi*hu.n t gjistance of 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launchedl 89dxud j-0ii from a catapult on an aircraft carrier. It reaches a speed ofi 0ix- 8djdu9l 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from rest moves with constant acceleration ay 1hp*dl: u9yc) v(gvc:9gtzof $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 w 6 ho:1pgv4 kx5-f5fprzrov 9m/s in a distance of 200 m. What is its average accelerationzfp:v65 f-vor1pxgw95h 4k ro ?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes unb ii/zvzx8c2i,a q4 dc6kgp i)w+9zx0 iform acceleration. During the first second it travels 5.0 m. How far will it trav p,icxzia 8+i )/w0d vzgciqk 92x64bzel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant accelem)b*y/jhvlj. 1t d2bp ration. Initially it is travelinj1. pvlb) 2mjb/*hytdg at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and acceleragurc5oyx5w. qr /;xjc6j c7:utes uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road can deceleratv2m0-hrbad( wlqd ..3fc t,g xe at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turns green, a car that 4v a4+1- +/ha ha,x3)kfs a+hda fg9zvghktuk has been waiting at the intersection starts ahead with a constant accelera 4 khzs)9ga/haagxahk+f3 f vka+d+u,v1h4- ttion of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s o6k/k.svfsi3jveg6(j y(a 1vn n the surface of planet X where the acceleration due to 3k6j f .gsv1/( nejkyv i(av6sgravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m(rlddu;2 )iqv6c3qit /s on the surface of planet X where the ar( v di26;ltq uci3d)qcceleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with jqbsc6n k61k/x,na 1l6nawb- a speed of 15 m/s on the surface of planet X where thebk 1jnx/nlc wb- qa,s6616ank acceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed ofssdz d),v2tf:ql , 5de 14 m/s on the surface of planet X where the acceleration vs:,lzdft5)de ,qds 2due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usuainw/bw;1ts1nrb;. uo lly greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far/n.o b;;t1rwbunsiw1 can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a veloci3r6hqgq9 7cn m:zz5ekty of 19.6 m/s. What is its velocity after 3.00 s nz7rqm563z h:gqce9k?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its starting point ivf(lw)*-kq2kfb g-b v s,,tzcn 10 s. What is the initial speed of the bulletv*t)vk-(f,b qw fc2gb,z s kl-?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up i asu 37r*w.0k;ulrv ewith a speed of 36.0 m/s. How long does it take to return 7le;ua.iusk0rvw*3 r to its starting point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a building with an initiai;kqy,:qvl ,al speed of 25 m/s. It strikes the ground after 2al,;iy:,qq kv.0 s. How high is the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 30 m/s. (only fill v)8zzem )bu 7ll76d lrin numerical value d r68mb luv7l)l e7zz)in the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the(rza6w6 rfck obw (:e1i9;gvfzx 9u- br9de*b air with a speed of 30.0 m/s. (only fill in numerical value in the blank) c:*wrbowgzek iva1z rfre9 u9(9fx db-(b 6;6
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velnq z0vyjo 8uj6a y;a.,ocity at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocit6 k a1vqj16-mzpn ez 7 26hlw7/emkdaiy at t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at t = 4.0-yzehmrqtgj 26ss + kt05-i1 s s?


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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the v dpgg8jf8pwly6ey d/pc)l/ rn s :,+l)elocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the aver0oe9)nvw kk:9aq d50+oz klzxx8i uj6age velocity from 0 to 4.0 s?


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the3xjqep k z1c0dgt d)fbo,. 7b7 average velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accd wukli k7o27fp1 1t7ya+ je;veleration at 1.0 s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleratioa w a0)gzb)g9kn at 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acc;0mg1 vc dclk0eleration from 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 to 8.0 s-ajx wb:fti:9a73k os?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is tht(g4m1k:ju1t dm v(upe displacement from 0 to 8.0 s?


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