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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: 匿名未登录  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 spac( 8i 9qqeuk8khe to another. Make a comparison between the displacement 898(i qqekk uhand 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 velocity of an objectv9i21 5rz2g:mf lww k1: rhglm7/fegk 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 c sj(mt hh1kv (*;zqe:advertises that their car can go "from zero to sixty in 8 s". Thi1(q :hmjvct* esh (zk;s is a description 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 axis experi,jlinquzv 2.gals v 1;8j,4 uym u;(meences 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 traveling to the East (+x dt5 mz*9afzf6j irection) begins to slow down as it approaches a traffi*zftja9f 65 zmc light. Make a statement concerning its 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 traveld* nu j vw85,w;pec/u7(ao oading to the West (-x direction) begins to slow down as it approaches aawd d;/7,vnpoc we( 8u5jou *a traffic light. Make a statement concerning its acceleration.

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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 ho;w8c* x-jv7 .6vjsmhw9im 8t 8lwxclv4fv6with a constant velocity. Make a statement concerning its ac9f-xhcc wlj7w6 v mvt8vs64;imo vj*w8.8 xhlceleration.

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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 -anxep/ c- i,0tv x(wuzero, does it mean that the acceleration is zero? Support your answer wx0/(i,ta uvxcwe- -pn ith an example.

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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 changhm+0nq +7kxbg:ek y q,e direction when its acceleration is constant? Support your answer with an eyk xnq0kq,emb++7hg :xample.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an objec8e i.m vr(t-0xhyy ii0jy +dw,t is moving with constant acceleration. Make a statement concernj y .ihe0wv8yxr,-d+ 0y iim(ting its motion with 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 acco 527afa; wecieleration is decreasing? Support your answer with an e; oa57icw afe2xample.

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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, movejb0v ms9pu 5 dlq.uc/;s up along a smooth hill of ice. Make a statement concerning its accele d5b cu.9mlps;/0uqj vration.

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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 averag k6nxhnjf k9l-b(3t)ze velocity equal to the average of the object's initial and fi(jbhn -3xtk9f)knl6 znal velocity?

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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 rest. They both acceleratvcpjc/uc ikywg7 , j ,pnq;5 ax9f+-2ge at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compa5p ;gvw2a7/qpfjn kix ug c9,j-+ c,ycred 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 both accelerate at heii*bcsu87 ;the same rate. However, object A accelerates for twice the time as object B. What is the disi;*ihscu8 e7btance 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 released from rest and fas+b 9fu +o6hbmlls in the absence of friction, which of the following mh9ou6 bb++ sfis 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 rest ao z 7hx)nngcy 8zrfr3 (w9k51m vd)4rend falls in the absence of friction, which of the following is true cr5k)dnw(h8z 13g7vzfcnr o 9e x ymr)4oncerning its 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 about the velocityi4*fu7 r)r7 r. gwbek8nm.ahh and the acceleration when the ball rearn w)b7mhr87 hi.g*ak.4efu r ches 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 bepk1 lb x13zkx6fore it reaches its highe xp6bkl z11xk3st point?

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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 up, reaches a maximum height, thu 3z7x qkykw*+en falls to its initial height. Make a +kqyku7z*w x 3statement about the direction of the velocity and acceleration 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 height, then falls to its init*y0sjm 1 dt*frial height. Make a statemens 0td**fmy j1rt about the direction of the velocity 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 resis1tav) u9vqht+ tance. Make a statement concerning )9aqvuh1vtt+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 plane. What is her acceleratie/8 8amug ed2/aqbqqnn-62nt on when she she reaches deq8nba22u n/mta 6ng 8-/qeqterminal 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 verticallydmmt ogx-3d1p,j,lz1 upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (Howxdo1,tmd-z g3 ,1jl pm 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 the top of a building. One second later, ball B is dr;s6ewc4 urx 7kopped from the same building. As time progresses, the distance between4cw7u6rs; ekx 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 z-4mkq, y2iibthe top of a building. One second later, ball B is dropped from the same buildkzqbyimi2,4 -ing. 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 bu2o93.njvose *,j ,hidv-m ih s6po/smilding. One is thrown up, and the other is thrown down, both womedh9,hojmjsnp *v, s-2v3 s oi./6iith 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 buildl f wpuvq;,9m:ing. A second brick is thrown straight down from the same buildin wp:fqm,9 v;ulg. They are released at the same 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 +x axis7 r +l1kaez13alw::3njat ajj. The position versus time graph of tl:ezn+r37l31t1aj a ajwkja :his 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-zjv,slds (4-k6e43c6y qlgc voero acceleration in the +x axis. The position versus time graph of this object ik(q4l6cy s6v4cj-l o,sg 3 veds

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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 with constantkp+ /y q/6kfzwq cw*q6 non-zero velocity in the +x axis. The velocity versus time graph of thwq k*/6yzkq6qwpf/c+is 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-zeroc8fvo4uf5at0 acceleration in the +x axis. The velocity vecouvf af405t 8rsus time graph 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 versum j7;lebh6f*h33gi e zaxxs9x;e(o l9 s 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 veloci;um, 7xrtpo( dty versus time graph gives

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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 acceleratioip 5*ck/ uqpz 5p5hmz)n 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 curvevx4pq8 scm++q 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 of an object is a horizontal line, thepn3 .y jno4fd( object isdoy4 p.(3f njn

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versujot1nq8yd7: n;pfvu geh 0:f4s time graph of an object is a vertical line, the object isd1f f4h:n 8;upyqntj7g0 e:v o

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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 tqai3h4t tio4c y;c;-object is a horizontal line, the object ih;i4 a4o;3t t-i cctyqs

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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 time graph of )x2tw r4wk us;an object is a straight line making an angle of 30 degrrukwx4w2 ;) tsees with 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 m qx5 mi1ttl+7 )j+tzfd south. Find both the distance traveled +f1 t5zjt7 q it+mlx)dand the magnitude 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 km7eww f*1 xx8om i cn1khq67j* 9hexb/y/h in still water. How long will it take to move 12 km upstream in a river f wwq 6/9x1eyhe 7x78homkfb* jci1n* xlowing 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 = 1609 yh.bnz0eni-y .a9jk1 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 trav1/id a1.ec1qnxkd (a+y f7ab gel 350 km 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 (approximately 42.0 km) in 2io7y6p a.pmu*kv: :.vo,4 vf 0rfpesq hours and 57 min. What is a,m.pv*6r:op:p 40 fe qus yivv .ofk7the average 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. How long does it take for it to trbk;(i.7edb 1usu 0 dvgavel 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 year. The w2pm -4q9cczdse07yispeed of light is 3.00 x 108 m/s. How many miles are there in a lywi2cmp sq7 e-z0d9y4c ? (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 7aic 4p-xm9x/ng1b3pn1g vc)f 2 km/h along a straight road and you look to the side for 4.0 s, how far do y3xm)nv 41 9g b/acnxg pcp-1fiou 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 tri)hf 3j 9-o1qww geg5fack (400 m), in 100 s, your average velocity)hqww jg - o39fg5ief1 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 soutl93 mnbo g.ik)h, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip ko blg3n).9mitakes 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 Pole. I:9b,ytc pe+nugt.* nuuppc1b9d/ vg1 t travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km 1/ ugpbn1*ytpeg:n99t. d,u +vubpcc west to return to its 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 o v yrl;7nn o46n1xa;mbn a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you s7a4;n1nobm ;rx y6vl nlow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown 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 atefzhwym *q8s: l 3u;j6 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for * ;l heumjyq:6 3swfz8this trip?

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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/hy jr(o. -2rwvcxb 08ot. What is her average speed for the t8ry bx2ocrt. ovwj0(- rip?

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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 300 mi/h souqn3xnvl 9j+s+z9 lc. zth for 2.00 h and then at 250 mi/h north for 750 mzvj .lxl9 cq n+s+3z9niles. What 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 abx ovr6w 2(3rrnchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team 3rrbv (wrox26B, 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-lx/b g;llw 2z1qeff9 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration l2g/ -l;9lzfbe1f x wqwhile 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 to 160 0l5 1 otp8kkbk5mrq.b m/s, at the average rate of 515kt8omk.rkbpbl 0q$15 \; m/s^2$. 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 nz1(l 1to7.*x vhlc vfaccelerates at 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 and accelerates j)tn21;c14 g5fy*+sqiv hpsx 4fuvn kat $4.0 \; m/s^2$ 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 constant acce1 xgqky/1l9hbf0 hj7v lerationlkhqbv1f xh 1/g9j70y of $2.0 \; m/s^2$ 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 experi75s(ilutb 0fr4o0e s nences a constant acceleration oo lfr50eb usits7 (n40f $2.0 \; m/s^2$. 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 horizontally to the right (+x directiodm3xs mm- ib+3-s (ul7bhkc. on) with a speed of 500 m/s strikes a sandbag and penetratesdxo mhk(3 3s+l.mc7 -suim-b b a distance 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 launched from a catapult :d:q vlfd 7uyelb4;5- v1oyq .zfq1deon an aircraft carrier. It reachqfqe bdlv;.4d71:u :l- 5 yyed vf1qozes a speed of 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 acceleratioct +33 r*wx2tdw1j6z 7u0oy.bcju ucen of $2.0 \; m/s^2$ 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 m/s inhb0kb3 1ccoz d: p+9dr a distance of 200 m. What is its average accelerationddbc930+ k 1hrzbpc:o?

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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 uniform acceleration. s aa5t 0re0m -,hlizef32alv: During the first second it travels 5.0 m. How far will it travel during the third seconm,-aa00lf2v 5 :ee al ti3rszhd?

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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 acceleration. Initi-4 x-5 .f(dlomuf8 fmkt0uvutally it is traveling at 16 m/s. Three seconds la ttk ufu0 v.f458xu-od(ml-fmter 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 accelerates uniformusc 15cls 8u/jly 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 decelerate at ndy4 c mzr++vm;**im;8 fyu dbabout $5.0 \; m/s^2$ 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 has been waiting at thph3 ;y r6gf8mve intersection starts ahead with a constant ac;y v8mrhf3g 6pceleration 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 4xn *f0v n7u.cq/rlor 12 m/s on the surface of planet X where the acceleration 4 uo q0cxr* 7nlrn/fv.due to gravity 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/s on+c sm43f iu2.m68dcb njfxk9g the surface of planet X where the accelerffnm3.uc926c mgjd b+i 8xs 4kation 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 a speed of 15 m/s on the surface of planet 3xwq6x2lf + vaX where the acceleration due to a63 lfv2+xwq xgravity 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 widle3z okn:8b +th a speed of 14 m/s on the surface of planet X where the acceleration due to gravit3+nd zkole: b8y 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 usually greater than 0.10 s. If y7y se15 uzacy(;s 1jvoldre2:our friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to s: 1ls;512r vocz7ydje(aue yfall 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 velocity of 19.6 m/s. What is its velo 27,n ez1uau cvjzyz-bf )p44ncity after 3.00 s?fzv7414 )a2,bcye -jupnz unz

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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 in 10 s. c eqo-g;9:qejWhat is the initial speed of the b- ;joq:ge9 cequllet?

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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 with a speed of 36.0 m/s. How k+m up q9h+v a9:258 tcbmamnglong does it take to return qkvta9p8+b:mhmc5 nagu+ m 29 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 bui:u c o-r *(n5trmo(x uypbdo/;lding with an initial speed of 25 m/r docbo (-*pu:ry/xuo5 tm(;ns. It strikes the ground after 2.0 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 in num( ukkm13wf;p 3q td(moerical val3otw 13k mqd(kmp f;(uue 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 air with a speed of 6*zrtt/ji-k vaxj42 b9i *y cs30.0 m/s. (only fill 4*6j2r/xat -vbckjzi is9*ytin numerical value in the blank)
(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 ven,hg/ d8n5 gw *q5* ucfhd4qnslocity 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 velo*w6xs wpc/fff3 8nke2 city 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 a5(2ueg k n mx6tz47swja lr.k5t t = 4.0 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 velocity at t(l8 abb/5b- goe lix. pyffibft38n(5 = 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 avexhim*z,3u 6i mjo 4k9-iljys( rage 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 hx6njw t:c*b4the 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 accel/ czd 3:qmyuc7eration 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 acceleration at 3.0 s2sm18 h+fmn rlihr6l 8?


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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 acceleration from 0 to 5.0 f8 pbt f(p a6 maafgox/.8zd,;j*bx7l 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?sa+h( q4fi0kpk94wr n


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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 the displacement fromvta6 q,8 ytjr: 0 to 8.0 s?


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