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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 aqnj xzw35:nsta2d jngq6 )3+onother. Make a comparison between the displacement and the distance trave5nx) q3wg:+j32 6 ostjadnqz nled.

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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 equ 5jo7tm.l,5g hc30 aanevghr.al 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 gy2d *6jw-tu-hkk cmb -o "from zero to sixty in 8 s". This is a des-ub6yk d-2tjkw- h *mccription 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 experiences anjp6t ;d+ -fhys me6xq* 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 direction) be /amdhow04m 1vgins to slow down as i d/ah4ov0m1 wmt approaches a traffic 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 traved9)4 ; 4die-xpjyxlm sling to the West (-x direction) begins to slow down as it approac;pxy)-ddm94s xj i 4elhes 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 with a constant velocity. Maklyak0f z;;z s2dv0(gg e a statement concerning its accelerationagf z0s ;d ;(0kl2vyzg.

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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 acceleration is zak u1wn c05 uibq9/,jxero? Support1 /xbuncu9i,jw0kq a 5 your answer 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 velocityqr+5 ,6bkjbh g change direction when its acceleration is constant? Suppg b+5k6jqhb,rort your answer 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 objec u gdq8,r.y+,:qdegqvyx4 1mo t is moving with constant acceleration. Make a statement concerning its motion wi,v 4o mydgqxq.yg d1e8r+u, :qth 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 decreasi zz6m*osmrk /(ng? Support your azm/ok*s(6zr m nswer 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 smoomt t.41x*qcsf/ wjz (pth hill of ice. Make a statement concernttm/4 j pfx(z1qcsw*.ing 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 ae wej6.l sgx:ossfj):i757 qv 2piw0v verage velocity equal to the average of the object's initial a 6 g iv275sjvwqee:p :)w .fsx07lojsind final 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 (zvc.4 fy (r roiw vj8+;8b8bfbsen7m both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object Bjew 8 rnr(.8+s zoiycbbf fv7; m84vb(?

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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 ratvxevx .a s147we. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of obje wxax1vv7e4.sct 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 absencj,3 e9dh t/x wing37gve of friction, which of the following is true concerning its motiodxnt ,gwv i37/9hg ej3n?

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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 absence of friction, whm+41zq3vj qj(mq d-l)b /e/eb5r mpuiich of the following is true concv(/ qpu+e3m/-dlqr1)45 jqmebibzjm erning 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 straigkfr/ xn9 edtf50hynrt:+4 r q+ht up. Make a statement about the velocity and the acceleration when thfq/rry9kdtr :n 4h+fx0t+5 nee 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 i )3eawcv *yna 72kf,dzs its acceleration just before it reaches its high aan,k 7zfy2*e dw)3cvest 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 th1r2gja)yz,how6+ , oq bff p-zrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going 6hqyz,)rfp 1o+g,bo2 z-fwjaup.

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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 faj3cj rw2riwib6f4o **lls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comi2jw*bijrwf* 4r3c6o ing 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. Make a stalb-cl8u,k /h7pq jki (tement concerning its 87(b- /ijpk qc,ul hlkacceleration.

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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 highw)y .g;lcs6 va-flying plane. What is her acceleration when she sh.gl;c s 6)avywe 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 ide r q++wwj508:j snfexcntical 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? (How many times higher d: s0cn xj5e 8wwq+fj+roes 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 (.pijo4kyj xq 7b64xv of a building. One second later, ball B is dropped from the same building. As time progresses, the distancjx viy.6(ok7p4jq xb4 e 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 second i5( ruh oohpq.o/: -knlater, ball B is dropped fnh/ qu:oi(hok5or- p .rom 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 from the tal bct/rrqjwi2md.(,bg v( )/or6 s(86 tj ekgop of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the st8tbjg,ow(2 /)ldr(ske bt(mia6q jr.cg 6v r/reet?

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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 secdblu5x4r;qy ve(q yk.8pjcrha.z,3(ond brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations3epj.uq (.dzb4vrlc8,rya 5 (qhyxk; 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)( w* ekte+5dej t7qqi +x axis. The position versus time graph of*5je+tedt (ke 7)qiw q 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 acceleration in the +x ax8h8wmxuk 3e*yji., yu is. The position versus .w,uj8mk*8yuh y e x3itime 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 the +x axis. The vel /r)f.c ie(rn4wv2rsy s-4z lfocity versus time graph l.wzivsy2 /(cr 4r-fsf4 enr)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 accesep.t 9f947zvwq qbr-leration in the +x axis. The velocity v v 9q4tp.szqfb- 9ewr7ersus 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 posit,)evxt wf ti+mjv*3ryhuo:(g/ 0uhq+ ion versus 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 grapmgxrzw6va6wu 1e es4hn 7g .((h 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 acceleratihkw(jpi*cgp g4b)p/3 u.ox)aon 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 velocity versus time graph givu) e/v. mpge3uku ,:ages

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versuske sby.f90 -lb2tg kp82tj- wy time graph of an object is a horizontal line, the object iy2tbp 2 .ks-t-8lg9k0yfe wbj 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 object islkn6wjr) 1 3qeg7v ;kq)grl ;6 nkq7vkj ew1q3

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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 *wi br,8b/lpn8 l w9hban object is a horizontal line, the object p,98hb /lr*8 li bnbwwis

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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 straight lr0drx;+g2ewh 3 e:q5 ko -eqnyine making an angle of 30 degrees with the time axis, the obj xe h:-gy+ke0 rw5doqn2q er;3ect 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 l3x89btu8;-bc vy.:nme o3bsys jef :and then 11.0 m south. Find both the distance traveled and the magnitude of the displacemebx.s;y9b8u:yv3-c: estn 3fo8 mb jlent 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 km6x z(yq0e1gy z/ npg7j upstream in a river flowing 6.0 km/(gyn gejy6zz0 7/p1x qh?

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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 sp(m 3i8f9zq6pvbt)ml e vu 7*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 km in 5yhhh.ir mgg3ky 6/j hac6 1r2..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 gv katd0k1,v 8,2am 7bws)qtt(approximately 42.0 km) in 2 hours and 57 min. What is thekatkvam,8 0 gtvbw ,17 tds)2q 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 toci70fyq5cz1w 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 a392 -m7e8en qyy d:3vvyv ozlpt2k2tone year. The speed of light is 3.00 x 108 m/823 3k ez : 9pqnoyevtyvytd-a 2v27mls. 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 and yhg3tu xm(g ksm10q3w2ou look to the side for 4.0 s, how far do you travel during this inattentive pt31( us gmw20gkqx3 hmeriod?

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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, your a iz)tzq9 awj)bq)ee9;veraq9b)a wzz)q; et)ei9j ge velocity 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 ate hlc84erstscxl/-w 6k7bo 0/ the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0btws/ho4l7s- 6 xce e0/c k8rl 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 1.0skf ))x2s/z1xs f5 ijv km south, then 1.0 km east, thenx k/sjx51) 2ssz)fvfi 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 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 weekend from school at v g8b:uunx2j :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 hometown from schooluvj:n: bg2x8u ?

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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 km/h /l 1d m)-*ogxm9;t1wpmrqj lvand 160 km at 100 km/h. What is the average speed of the m m/prxlml-md;o 1jgq1w)9v*totorist 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 atz:y )dc. dj:d.xojg4z 80 km/h and 2.0 h at 100 km/h. What is her average x4c.:. y zjd:odzgj) dspeed for the trip?

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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 2.03p+abig)p hl7 0 h and then at 250 mi/h north for 750+ ) pi73bphgla miles. 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 t95ac05zito u4pqa . r l7ehb)yhe anchorman (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 B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when7paqit9)h0a 5c5 4yorulzeb . 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 k:fi1b20t hlcth7efdr-m q:1 and comes to a stop after 10 s. The car's average velocity during deceleration was t 0lc:m 7i f-k:2 rqdehh11tfb50 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 to 160 m/s, at the aver c5c 2a 5k7w/afhvk2snage rate of fk2v/w72k5s ancha5c$15 \; m/s^2$. 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 accepian ; ccuxh c -o910+6edffl6lerates 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 re b+6r mqfk71*yl-ow) t8 oze3jl 2bfxxst and 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 uppkb 2ze84xl)7qp,kz z :gzlc8 with a constant acceleration of 287qkb8) pk c,l:zezzl4zgxp $2.0 \; m/s^2$ 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 d mwt ay84winq 2+y7 /9qlrxxi2 it2r3a constant acceleration of 3w 8 y+itawqim 9/nyxrqx2 22td7rl4i$2.0 \; m/s^2$. 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 dps i ga4 p6f.v32w ct.qpj*3xkirection) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What i6f23*.4q pi jwvpsa xp.gt3 kcs 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 catap)ow e 3( ;t.wa:umfwm6p:c tfvult on an aircraft carrier. It reaches a speed of 42 m/s at the end of vm cpt ;t 6a fwe(w)mu3:.ofw: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 accelerationf;1cytox)rdu-* 7 a ec 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 qwj2x,9jof r;mx)6s l in a distance of 200 m. What is its average accele;s2oxj),6r j xmfwq9lration?

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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 acceler(;j g. ,pfh9w,x anrnvation. During the first second it travels 5.0 m. How far wign9w,r jxfp.h,n ;(avll 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 straight line 1lv vxr0 bfm-x)iw6f5with constant acceleration. Initially it is traveling at 16 m/s. Ti6xfx1r mfvl b-v)w50hree 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 accelerates uniforbefm 1ckav .wkgniy r h4)kvl158(00o mly 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 deceleratq mvk(,p7hx y*e 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 traffie5hav 4h (6nnimq9q v,c light turns green, a car that has been waiting at the intersection starts ahead with a constant acceleratio9eqn(ma5 6v4vqhh,n in 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 6zzisti1 6zlx6 rj2: ron the surface of planet X where the acceleration duez6j6sii 1r tlrz 2x6:z 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 the surface of planet ivi8 6, w7pgrmX where the7,r6pi 8mgwvi 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 ofc64 6hy gendg- 15 m/s on the surface of planet X where the acceleration due to gravity is n yc-dg6h6eg 4$2.5 \; m/s^2$. 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 witybie)yqz l;,tg 5a ((jh a speed of 14 m/s on the surface of planet X where the acceleration due to gravza b(ye5lg,y)ji t(;q ity 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 usuavmg2t6j ojvd aifdkg )gt. :-0j)akn d7 e,5a7lly greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall7k da-gg,e0n j.:))gati ma62t vd7 jfjkvdo5 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 velocit56.tjv e iso,rphko ;;4nt+mfy after 3.0vspof.t54er;hno; tij , 6k+m0 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 upt ,kk.h 8r8)t4utpve 5dmkf2h returns to its starting point in 10 s. What is the initiap)ut88hdkm .krv4 kf, h e52ttl speed of the bullet?

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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 b6/g u4 cc tgp 8lo,l r+,kkvbygug),2speed of 36.0 m/s. How long does it take to return to icup ,+g4 )lblg,8k /uyock,g6 gb rv2tts 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 wix ac2: ri94:xsr/l5sdx3xi-l4 ax5 wap7 ohlq th an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the buil4xoxrc24x 9lqa73/- w:d i:xsx5spa 5h iral lding?

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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. (onlbe3 uor-a. . qwx6g-lw5e8u-lvvhnv 9y fill in numerical value in the blhe-3nu-gw6b v9vq l .v5lr xw.u-8oea anks)
(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 tw0-*t9h6rq * rlpghashe air with a speed of 30.0 m/s. (only fill in numerica-6rs*q p ha*0lht9 wrgl 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 velocity i6xo:-lo 2cpp,za a9b 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 veloc,+km zr0+amhi0zek) w ity 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 8e vot+o saxs-2s0izqf: f: s:f6ifu )= 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 vp0h/dyf 3lvz5 b4m++lv 2uqdt = 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 velocity from 0 to ag4.tkp ,k )ko4.0 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 a*vzji y34d5nh;qqv: qverage 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 accelera4/t yz*wbxog b)h7jke.r p9ytg un: 7,tion 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 a4:a pnpmc*mo ;cceleration 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 acceleration from 0 to 5.0 pl/qk m:fit 2ex/)wg8-p1wt j 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 the3.eut y1 qe3md 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 4 bz9u)tok,eidisplacement from 0 to 8.0 s?


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