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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: admin   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 space ; h5 mpqe0d vm;kb78anto another. Make a comparison between the displacement and7;vd m kh0ep58bqanm; 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 1yg78 rkn6mnj 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 car can go "from zerolq2;k--x(7k0(g amlyhk ls cn to sixty in 8 s". This is a descript lxql7s h m02a-clg-; knk((kyion 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 expe-zw,l p;krzy7 riences 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 directy282u d2k z2 qf.frfgf( +khiwion) begins to slow down as it approaches a traffi2k +q2( y ugdhrf8.k2 ffzfi2wc 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 traveling to the West (-n4+;n wu6mqhox direction) begins to slow down as it approaches a traffic light. Mo6m;n n +w4quhake 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 movingq) ;7/-gw s-s2yo fky drusgk4 with a constant velocity. Make a statement concerning its ac2/oy gfuwqsdyksg-4k- s7r );celeration.

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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 mean that the accelj5buz5 tizt/i/0fl b ekd4*a6 eration is zero? Support your answeral */z4bjd6 i0k euf b/t5it5z with 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 change direction wv*e :*obmla yb,mg7)ihen its acceleration is constant? Support your answer with an e,i:mm*y*b)7loe ab gvxample.

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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 with constant access73 y)jhip3 hncu )g8leration. Make a statement concerning its motion with respect8)h3p iug7 c3nhy)jss 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 y /9qmnwvob r2t2 wfy1g2or7 7speed while its acceleration is decreasing? Support your answer with an exa/n2wyq2 vb2t7f o yo7r19wrgmmple.

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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 smooth hill of icen05dm +gpz r7o. Make a statementmpr7+dg5z n0 o 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 averag2c6,qpkmre+ grj3,0p ny i3kb e of the object's initial and final velocity?3 ip ey,2brkjmkr+ gp,3c6n 0q

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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 at the same ral(ek;vzpjt,w z 727uc te. However, object A accelerate2,jwu; k77zzv c (petls for 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 accelerate at the same rate. lz02 n(k z . p,j.bymws10kxjky4hy (zHowever, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object khyb z ,xjwsk.jyn1l2(kzp0y.z0m 4 (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 i,dnd ,h5kqy98 ee:rx9t:ajk fn the absence of friction, which of the following is true concerning ij9 5:,x9nyk aek:rf, 8deh dtqts 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 absencew,tfd2 8uav+2l/ wq0 pr dih0l of friction, which of the following is true coi/ +huqww t 0ald2p,l 208fdvrncerning 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*d- o cyyf,pe: a statement about the velocity and th:ocp, yd-*fey e acceleration 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 steiy omv)+at5 q8h/n cgvwu6 ;/ m7pu9praight up. What is its acceleration just before it reac;+78 ue)o69q5vv mgi hnp/wcmp/tya uhes 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 height, then falls too3/goxu7)j624s, j oodzpblq2 f-c nl its initial height. Make a stateuc23x-,lj o)bn4so6jo7pf zd o2qg l/ment 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,;iug3 t;4tz3sme 2kq g reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accele4ig qe;gk2;zm33 ttsuration 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 thr-66j ll(ekf*6fa:r pw i2obqz 9/dppiown downward in the absence of air resistance. Make a statement c6:lpopf i- prak9 efb q26jd(*wl/ i6zoncerning 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 pgcq-j koj4g m4k1tnzc :398e plane. What is her acceleration when she she reaches termemco k:j44-3z9q g8pcgnt1kj inal 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 wi+ .a (fvpu(lluth a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio o vu l+alf(.up(f 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 fryxgt9-asa0 9-c7+t5v+o brnhgo 49 bcmgun3lom the top of a building. One second later, ball B is dropped a04- 99uv+7+g -tcsxblmt3h o95argngnbcoy from the 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 6on0u iyay ,4z.tm3 t*klcm3t building. One second later, ball B is dropped from the same building. As time progresses, the difference in their to uay .tki4,30zncml3 t m*y6speeds

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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 thrown up, apiwy79f 6a0v hnd the other is thrown down, bfh6 ay09w7i vpoth with 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 o hn5mb.b/8 d pgl51:g nxs jmko7wy+p-f a building. A second brick is thrown straight down from the same pxs15dp/mgbo nj +5-l8 bkg7y:hw .nmbuilding. 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 wis -y )a:,,dvlka bqt/ith constant non-zero velocity in the +x axis. The position versus time graph o)lkab-iv :ya,/t,d qsf 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- awu9x+u 7nf8zzero acceleration in the +x axis. The position vuwx 9+8zu n7afersus time graph of 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 with constant non-zero velocity in w/ fn(n;d;ncff 5xzc0the +x axis. The velocity versus time gwc nfzn0;; f nxdc/f5(raph 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 constant non-zero acceleration in the +x wm:cwsn l3s tn.x) v4wd+x 6;iaxis. The velocity);wl43xiswvs wdmt n .xcn +:6 versus 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 versush6m 6/7*d59ys f.u yjv)ht9 mtebgqsn 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 fj;d:v ,x/0 iob -nid, 9r8vqa oc4vuugraph 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 acceleration versus time grapb :m*0vo-dpzjh 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 p.ge2tk,f o vnl/0o3lin 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)a.39(i sov9jz bhlnm of an object is a horizontal line, the object nz 3b(o9m vs ai.hlj9)is

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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 on/ u qb8hb84pqbject isq 4qpu /h8bn8b

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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 objectcc)8g z;1zeh l9nogta0g8 oa: is a horizontal line, the object ;a o:geagg9l0c8 8tnch z)1 ozis

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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 c 3+ cqqbf;0g-xa1upx graph of an object is a straight line making an angle of 30 degrees with the ti- bxfc q1xga0+pu cq;3me 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 south. Find both8j 30. htu.eh 7pxsw :(, akp(er;gawnpi 8acp the distance traveled and the magnitude of the displacement v.itpe:wwa;a ph g83upnk78. 0s xh(apc(r,j eector.

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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 l9 o, tlg 9rnn.8bi3 6 takgh58hndc5iuong will it take to move 12 km upstream bh oittk a.gnd98h6g85cnrun3,i95l in 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 = u,k5z-6,w pa72 huvgoqegx 2w 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 ave)aid-)4spm mjb) )hb0t6eyibg x, sr 1rage speed in 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) in 2ulbbfibr 97t 2w++ qi+ hours and 57 min. What is the average speed of the runner in +lfbt 9wi+br7q2 +buim/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 949qr5c5bvm iz n1 vbq3ep 8opdoes 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 l *3qvc-e5s rqtravels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mis 5r3vcqqel*- = 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 alo(g.l 6;bypioll u:w;l ng a straight road and you look to the side for 4.0 s, how far do you(o6 y ;ublwigl;.:l lp 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 trac1ayr ;j: 81mwt9i( olg7pepjsk (400 m), in 100 s, your average velomyatwi9elr1pp :7 1o;( gjjs8 city 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 Polx/mee .;hde+- vpay-lxf/ oo6e. It travels 1.0 km south, then 1.0 km east, then6xoem he-x.;ol+-d a/ p/vye f 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 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. It travels 1.0rppk)8v lau+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 +a08rkvp) upl 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 weeke+n/by k1f m4ennd 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 hoursny/b e f1kn+m4 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 n:n.,r a0kzvl at 80 km/h and 160 km at 100 km/h. What is the averagkv :,nrzl.an0e speed of the motorist for 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 a q6kd4q py5ggf(;h 8kat 100 km/h. What is her average speed for the 6( gpqq8dyk;f5k ga4htrip?

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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)wy9o c4h (o ag myu5kt+3:exo then at 250 mi/h north for 750 miles. What is the average speed for 3ayowm)( oc:o+euk9ht 4y5xg 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 ru t c2/ 8xkocd/ctb1/lnns the last 100 m) 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 runner can have when the team A runner starts the final leg of the race, in order that the tl/c btktcox1d2 c//8 neam 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 uniformlywh5p6,d z:j. gd*etw b and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car'e*j:d p 5zdbgwh,wt6.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 spobv7xi73tf7 peed from 100 m/s to 160 m/s, at the average rate of i777povftx 3 b$15 \; m/s^2$. 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 at14 sbyuy 1sz*va i7+xf 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 acceleraulebh8,jch*,9pgk zb+9a * lqtes 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 adsw1wkdl 1 + ;3saos*cwn 21cup with a constant acceleratio ;wdwc s 3oc2sd+*k 1ln1wasa1n 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 experiences a conshym3 edj .w8yc2sd i,4ih 1 nmsl(8kn;tant acceleration oeji2mwimy;kynd (n1,sl8dh4ch .3 s 8f $2.0 \; m/s^2$. 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 speed6i.i1 opum p n.h; /y6od;xaxm of 500 m/s strikes a sandupx ;x .6i1dpino m/ 6;hya.mobag and penetrates 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 on an aircrx ug* *bu z d-6dvk6zn0;rwr6saft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assumin6zbku6nv xs d d-zgu*0 r6rw;*g 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 acceleratior5*2ybpkt/ y:hfo3l3ra 1lk pc;xh)yn 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 in a distance of 200 m. What is its average h olh 77ibt0v:acc07tolh b:i7 hveleration?

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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 unifok2,)/84h(mha.uvt r qeqbq iicoo k47 rm acceleration. During the first second it travels 5.0 m. How far will it travel during tt.4i a4/qor hqhke) q(kmuovb7i2, c8he 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 acceleraevyk/hb x+(gy 4d)d*ytion. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this ev(gydxh kdyb4* y)+/ 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 unife d* yee7ur-c-ormly 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,k nh(1np ijru,28 xne 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, a car that has been wait9s1lcy9wjdq w 5mgbr )ss5q 4+ing at the intersection starts ahead with a constant acceler bmsjys rc5gw94dw s+l)q19q 5ation 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 of planet X w)lbfwfmk: 7 m:k0gmn)lj5u/b 2 t8d luhere the acceleration due to grau uf0:8mtlm )mfdblbg2 lk /w75:j)knvity 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)n p1ldp+a:k c with a speed of 12 m/s on the surface of planet X where the accepl+dn 1k)a pc:leration 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 o njl:k35mig;qxto)(s wc/l 0gf planet X where the acceleration due to grav)xl5m ;gocj:(ltik0 3 q/swn gity 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 of 14 m/s on the surface of pl+.x0hu3yhbb/ lu af ;lanet X where the acceleration due to gravity is by xuh0al+f.bu/3l; h$3.5 \; m/s^2$. 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 greia4 t.o d0y2vxater than 0.10 s. If your friend holds a ruler between your 20.yvtoa dix4fingers and releases it 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 upwk8ap/+p sadk6o zd8g4*ty k2yard at a velocity of 19.6 m/s. What is its velocity after 3.00 s?kya ops+*dg 4za/p8ykt2d6 8k

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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 toom7i os* :p:jyr o9 f18sjck*o its starting point in 10 s. What is the initial speed of the bs oso * ry1ojkip9:j m*7:cof8ullet?

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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 az- (iskn u38ye speed of 36.0 m/s. How long does it take to return to its starting poz k8-yu3ne(si int?

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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 wiosma9m(-s b )fth an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the buildinba fs (-)somm9g?

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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 in0y55bce1+y c i,e4gi+i crjl n numerical value0b yciljigcc ++,reei5n5 y41 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 30.0 m/s.vs8h/g1 w +qm w l7yy9cd74snc (only fill in numerical val48/ lg7 7w c1dsy9hqnywsmc+v ue 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 velocity at t+v*7x:qm) dpg*tgju d = 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 iso. lo 3c9qw5cz the 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 = 14 .tjgk 0ihgh4.0 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 thewn3 c 1+ iphjwag4.0 +yxrslv2 velocity 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 v0kop puxs/ mxm685n*zelocity 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 veuy3r hm,e/n/tnaa+9hd jq5 i 2locity 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 au3.+ r13 dir4 jef*)wysrbknscceleration 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 cu58q+ohq stuq *p)7 zacceleration 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 acceleratiz3xg oct- vpyvn0jobo,e8 d3jr20c,s6z- 4oron 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 is9dj rx1+r7 hhd the average acceleration 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 disp(iovrpfoj3g9.l 3 n /elacement from 0 to 8.0 s?


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