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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 f,4*- il 51oj z4n2wmfq.kzq h2ep qlthrom one point in space to another. Make a comparison betweenn 1izhljeh 2*z42o5-. pk4qqfwmlt ,q the 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 velocity of an object equal to the instantaneous velo) .6tlw- jk wli.jr m2pov:/afcity?

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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 c)6 2qfxrhp,k+iq8yt1hx( jf r) 3egnuar can go "from zero to sixty in 8 s". This is a description of,) j8xq3(uqkgp6 nrhf2+iferxtyh1)

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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, ki+lxecgnc8;k:9ox +x axis 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 traveling to the East (+x did52h:dhl s0y*yaon w,rection) begins to slow down as it approaches a traffic light. Make a statement concernins d:hd2 ,0 *ony5ylhwag 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 traveling to the Wes1 k7kqu;,co ryt (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning itsc1rkuo ;yk, 7q 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 with a constant vell/q9hbwj/( h9c vy r,xocity. Make a statement concerning its acceleracl (hwyj,/hqx9r/v9 b tion.

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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 it mejz68g..w 8pw1yxzwub m. ;lbf an that the acceleration is zero? Support your answer with an examp8w gxz..6z;1ylbb f8w jmwu.ple.

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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 change /qnag+;nt :bcm4hka+n8 :krud1zu0o direction when its acceleration is constant? Support your anc+tnmz/18and:;ar b:khu0gu kq4o+ n swer with an example.

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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 moving wita0c/(qbh8wbp.fwh / g h constant acceleration. Make a statement coc/.hh0ab ww bqp/(8 fgncerning 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 acceleration is q. zew9j2o:l28dzf3ecsqnf), awh g0 decreasing? Support your answer withh.we) swq9zf3 cn al0q22doge f,:8zj 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 uppquc)f2,+j ed/ eibh su5z4 8f along a smooth hill of ice. Make a58i,du jcp4qbefez +h us/)2f statement concerning its acceleration.

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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 average velocity equal to the average of the object's i6 a edf, vsc)v3f*sfv)8vo +glnitial and finsg )e 8 vva+)3vf ,vfl6csd*foal 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 accelerate tgx+7 dc c426qq2pxd cat the same rate. However, object A accelerates foxc pq+ txdgd72cq4c6 2r twice the time as object B. 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 both accelerkge;/uif9x9i j g 2k;0ro+fmrate at the same rate. However, object A accelerates for twice the time as object B. What fkog+ r9km xui2gi;0 j9 ef/;ris 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 released from rest and falls in the absenc()zb,ux9 /d vk frm)dewp3ej30rs5c c e of friction, which of the followingu/fd))c( ,wbpdve3cx 9 r350rmjekzs 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 rest and falls in the absenc0 (q4pjauvx*ot00v v/qq cwb)e of friction, which of the following is true concerning its motion?pwq 00vcxa 4b0qtqv* )ju(v o/

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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 velocity )w4zilpq :.gland the acceleration when the ball reaches the highes4giwq: )lzpl.t 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 str a.9)zh;kydv qu-l(/ cnduip ;aight up. What is its acceleration just before it re9lk (; )v-dq.azyhuinc;p u/ daches its highest 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 8yq- (ya5sif +r8elmyheight, then falls to its initial height. Make a statem(8y8- yr 5yif qelm+asent 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 fal5 ca;tf :bgql+ls to its initial height. Make a statement tlq b:+fga;c 5about 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 abseg8 6zg5xj1 vknnce of air resistance. Make a statement concerning its accel 6k1xnjggz8 v5eration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps2.at-2k k d*gt(p0pely- iih rdn0f yh6j6x5j from a high-flying plane. What is her acceleration when 6ydxf- hh2t-*ag60jt.lp dy j20ip(5ienkkr she 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 idenr988gz: fbd xntical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of bxzd8ng8r:9f the maximum 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 the top of a building. Onpkq/ ox20ur5t- qp9cm e second later, ball B is dropped from t0 /5qkxrmpuq9 -o tcp2he same building. As time progresses, the distance between 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 secon e:ob f5,mqzqn*db0fqqh 1+n9d later, ball B is dropped5f*fbmon9+ d q1,n0: hq bqqze from the 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 fro3 2.z6*y.ts zz-qres8phisikm the top of a tall building. One is thrown up, and the other is thrown down, both wi3t8 sz.zipy2 zkre.si qsh*-6th 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. A second brickwp k x7gig(-d9 is thrown straight down from the same building. They-p9kgdgwi x( 7 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 axis. The positio)he9ngek q (hgab7q pesbi),5 q7n7*zn vers*75e)(q ,n 9kbg ehn e)7qphzbg7si qaus 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 witpufx q-;+ kng8kyguk5tmi4)+h constant non-zero acceleration in the +x axis. The position versus time graph of 5 m4-)n fkugkqu;+t+xyi8 kpgthis 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 with constant non-zero velocity in ta c++ 0.ffe)m1aoiig qs5knw+he +x axis. The velocity versui+1) aqin+mf ak0ego. c+w5fss time graph of this 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 con by/jefs*v 1ymqip) a3xo2*u7 stant non-zero acceleration in the +x axis. The velocity versus time graph of this o*qp73xy oyub fas2m/ v)ei1 j*bject 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 versus time grodwef8n o;(e ypijsv9-h13 ;paph 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 vers qio7wb,ic f*ea(5 x,tus 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 acce2fjq+n6fn ,t 1zkxt5a j-z,b mleration 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 in a velocitck (xq*xghl : y;k,:lqy 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 hy av) ;4ua2eehorizontal line, the object i)ee4uh; vaa2y 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 vertical line, the objt/-sj bv9 ,sh ,s0dekqr.cv qpxaifpz2/c3 *9 ect isr/x, zsv9c90hp,se2v*i-tb 3/f dcksqqja p.

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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 horizontal line, 91dpaoqkx1vp 5 m( 2 fq0lbr;c1rqpyd /9)ldgthe object ip )d01fqll9dov /qy rbrp(912qxmd;c5pk ga1s

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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 an object is a stradd26 b2gmy52yils- 1b:pqi 4zmzgs -might line making an angle of 30 degrees with the time axis,5gmgb- 16mi4qzy-bzl:222ymsdds i p 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 south. Find bot 4f,jg hnzr 7)u9rg4tth the distance traveled and the magnitudrt tj, 4gn h9g4rz)7ufe 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 iz2y;u.k /d( 2nqvrhg+bla go 6t take to move 12 km upstream 62by( un2ql/dvza ; ggk h.+roin a river 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 = v xkjwi.5,19vmqb7iej rs 7h:1609 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 isn1x,h xzh ztqk/nw/4s /() gvn order to travel 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) eial* eyo0-:.jnpj vz+o2j6bq8 bw)din 2 hours and 57 min. What is the average speed of thebw-2y. )j8o 6l:a*djqp e0zo n v+beij 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 tra z)azrhow vs23wro+((ve5 c.ivel 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 traveljj;cbe vo; a+ ;w9:8 rxkorwm/f0jo5ms in one year. The speed of light is 3.00 x 108 m/s. f5j/jajr o0wov k:+co xm ;brmwe;9 ;8 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 road mdeh-fn 9*f 5 .qqfgx5and you look to the side for 4.0 s, how far do you travel -fmh x* fnd.qe5f5q 9gduring 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), in 100 s,z0 /c2d tknsc/e6vw/m 8pjvh) your average velo2dkj/ e/ /vhw8) z0c cnvp6stmcity 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 ddhsqv ec .an:pvdj6* 79;.: uwgu6gyat the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.:dsvu 7q.jen9h :* dd6uay;gw. 6vgpc0 km west to 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 Pole. z*u,)d gr,jwuIt travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average vel,u jud )z*r,wgocity?

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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 weekend from school b+2q qhm:+wxj86cqgh9moy)zat 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 yo:hxh m) j96q+q 2b8wc+mzgoqyur 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 a/u9 wq /.txs8kk j0b gvtl7-jvt 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist fj 7juq89lgxvstkb.wv/ tk-0/ or this 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 1 , tp6k;7myv9a5bmgr j00 km/h. What is her average speed for the trb a tk67p9, ;vyrmm5jgip?

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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 south for 2.00 h and ;puee( stv8pbk3p;; 9g(yf pwthen at 250 mi/h north for 750 miles. What is the average speedp;p9 v(tweg( 8k3f;u ;byppes 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 last 100 m)mnx l:vccu2 6.ddrr wol(5 7a7 for team 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 rundc: drc nalw(6 x72mrlv 57.ouner 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 aver *kq fwbmdl7 vd61f8c4age velocity during deceleration was 50 km/h. What wa7c 1v mdkqwb8df 4fl*6s 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 to 160 m/s, at the averpds5ld ( f nm/5vj..9y3medxd age rate of /yfn9 .5pde5 3.( vxsj dlmddm$15 \; m/s^2$. 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 kciwd+a q10 ,uuu8rbgn l6hf4t7eq -y 6m/h accelerates 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 accelerae5(yga e 2so.j9 my,hftes 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. Iteo:wu.:7,) i(is1dfqqlzpl eyi h)d/ 9,nxoa then speeds up with a constant acceleration of,h/ .::ii y ), dn(l7wqzo)f19alqxpueeidos $2.0 \; m/s^2$ 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 c. ,x)oahz wd:zlm +r9gonstant acceleration of z9o)xad . ,wgr h:lz+m$2.0 \; m/s^2$. 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 direction) with a sireq;:fwfrru 2g2 l58peed of 500 m/s strikes a sandbag and penetratee2q2 r8 fwur:;rgi5fl s 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 kjzrv0te 0l3. a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this rjl0rz . t03ekvequires 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 accelerq.7hk6b1vq qnnm9kn(.u7x n nation 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 tul 6o hvon.2 )z2odqx3o 80 m/s in a distance of 200 m. What is its average ac oox3l2ouvh)ndzq. 62celeration?

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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.icww+.3u bep+o-m7 lakcl50 ;9em z ul During the first second it twuu5wi7m+ mzp-c9e. 3+ lol ceba l;0kravels 5.0 m. How far will it travel 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 straig5 y li4 3,ioiwpxj-r1qht line with constant acceleration. Initially it is traveling at 16 m/s. Three second l1w r, ix3ipijyo-4q5s 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 accelerates u jq24 1smbw5jjniformly 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 uv(se: q7ef e95wm*nxdry road can decelerate 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, atcb*qwl .s l x3o5i6igu 3o,k egn;o0+ car that has been waiting at the intersection starts ahead with a constant accelerati* wol5lo+s 33g ;o tbexugikqcn 06,.ion 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 on the surface ofabnq(v.4 9b vf planet X where the acceleration due t.bv49 va nfqb(o 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 mbuq 2is8 2.ozp/s on the surface of planet X where sqo.i2z2u p8 bthe acceleration 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 surfay(+qq.nz6fqnty5 v/ 5hht iu;ce of planet X where the acceleration due to gravittvynny/zi55q+; q.qu(f h6ht y 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 w 0khynvat 6;o8ith a speed of 14 m/s on the surface of planet X where the acce t8oh;0vynk6a leration due 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 usually greatev:iwgjal2 7e-8r ev j a;55ojrr than 0.10 s. If your friend holds a ruler between your fingers and releases reoa-wg;jvlrij75 5 ej:2av8it without warning, how far 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 velocity of 19.6 m/s. What is.:k.87ktq1brprg2,*xfqq db9ben ns its velocity after 3.0nxqt7 kp*: q.2b1reb.d,knrq b8gf 9s0 s?

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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. ;f 7, dyn io4yemr-+obWhat is the initial speed of the bulleto ybyde4 r 7ion,m;+-f?

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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 qz gipx xjs e+v42;:d798( b,hz pkotk36.0 m/s. How long does it take to return to i+:vokxiszq,4j ;zt kp 9xd7hp g82(bets 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 wimvr.a 7 5owxzpn9c d,6th an initial speed of 25 m/s. It strikes the ground after 2.0 s5 d .on9x6wrzm7cv,pa. 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 straip bw8*u-ypu8 pn1bms6m8gwi* 7 ny+gpght up with a speed of 30 m/s. (only fill in numerical value in the blan88*nimy*psuu p7ywg + 8b bmwn6 pp-1gks)
(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 aap,b hn w/6ng9ir with a speed of 30.0 m/s. (only fill in numerical value inw9a6pb n h,/gn 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 velocity at t = 1.0(m2i)b7z8qgothg vm;e+4 t hj 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 thec-tg .w0o rrv2 velocity 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 = *wl )fqr.*rrs4.0 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 velr,;0xu fbzv27nfulzzc5 t*9eocity 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 average velocity4 .cplkax/0 w)u;ug7e f5x(zrd jl bq2 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 the average velocity:ihlt9ri4wmb:ul0. t 0orb 3w 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 n:bvy0fsq;w 7kb (p e4r)0lw xthe acceleration 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 k7kjv,;s b5p nthe acceleration 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 acce 33pprl pswljp8 1y2i:leration 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 accelerld i:n7/fuz.,g zt 5 rq)rb3z)wdkid4ation from 0 to 8.0 s?


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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 displacemen// sf:ob e3zlq1hf rz-t from 0 to 8.0 s?


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