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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 onefuib 505it pb )-5wbtpka ur87 point in space to another. Make a comparison between the displacement and the rtkb50ipa)b i-pw ub855 7tfudistance 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 equaix2.d mdqh ../zqnuq. l 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 adveriu3 aqk 12j-i7o9 iutltises that their car can go "from zero to sixty in 8 s". T1- 3u 27iiij9tluqaokhis 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, o0qop-ki;cbences 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 * yia4ms0( amydirection) begins to slow down as it approaches a traffi msai4ay*m y(0c 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 Wes.d0, gh b)b-+gy+fb6rikkjnrt (-x direction) begins to slow down as it approaches a traffic light. Make bf-k i ,.nrgk)gybbhrd+j60+ 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 co85/( vw- iw)l sla puobpxzqs4r fx5+0nstant velocity. Make a statement concernqwif pl-wl o0ap xv5rbx)8 4(5zs+/suing its acceleration.

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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 mean5e sc/q v1pfg, /ywmo: that the acceleration is zero? Support your answer with ams wpvf 15c/ qg:/o,eyn 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 dir z 8:zznh (dalf,(an*aection when its acceleration is constant? Support your answer with an z8na(z,dh( fazan:l*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 with constant acceler is5,c ghmxf ono)9x06t 9*yfwation. Make a statement concerning its motion wit9 x*,sy f0hxf)5 c6tnmiogo9w h 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 jhpm9d0s;hk - its acceleration is decreasing? Support your answerj pkd0-m;h9 hs 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, mov- muog 79/n:ch2vc ngtes up along a smooth hill of ice. Make a statement con9-omhn : gv/c7gnu2ctcerning 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 avho0r2+l, /qamka b y(oerage velocity equal to the average of the object's initial and fi(a+0o,r bqa2mo /yk lhnal 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 accelel*p0ls nppnktf:6o/qh-i - )e rate at the same rate. However, object A accelerates for twice the time asl6f sl)-kn0pq-t*o eih:/p pn 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 accelerat *m pbz wq.pp++gf.-rue at the same rate. However, object A accelerates for twice the time as object B. What is the distancqf.b*z. - rp+ +mguppwe 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 t pme;+mz/ nc-hhe absence of friction, which of the fhc;e/pm- +zn mollowing 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 absence ofj-z oj5gjyk// friction, which of the follk/oj-5j/zgy jowing is true concerning 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 straightb+j av0.q*f ewrk 2z 6*vopkt/ up. Make a statement about the velocity and thjae2pw*rkv +b 0vk*.of/t6qz 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 straigs2p 2mari oqgbt06 6.tht up. What is its acceleration just before it reaches its hiam66i rg 0.t2p2qstb oghest 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 steohh9ws)w1 i0vbm.+;( p rw plraight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of(.0iw s9hp bmwe phlw+v;1)o r 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 4zb9aa4 f(fjt:sgp72i(n kd hits initial hezbah:d n sg2f(k4atj9 7( fip4ight. Make a statement 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 downwaeurtpwqe71a s5)3on75qt j a*rd in the absence of air resistance. Make a statement concerning its acset173 janq aot* 7)weurpq55celeration.

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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- w,8 1akn3bgp.e rffzdhzz+ 72chw,l9flying plane. What is her acceleration when she she reach , w19ghd+ fnkpzherw32 ,7lc8bza.zfes 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. A9p :qf57fa.hgw3 ckf7wkd 3 fsn identical second ball is thrown upward with a speed 2v (twice as fast). Whacw3hwadf :kf77ffk . 9s5pgq3t is the ratio of 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 6v. z3hsz:dbvz df2+0zch z 5la4/.+ j twpwdza building. One second later, ball B is dropped from the same building. As time p+5vs0dz4j . cz6+:zbdf.3 z2zpld /w hvwhzatrogresses, 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 sp8oou 8 *d 7k pm7+piy1zh w4*8ipdictop of a building. One second later, ball B is dropped from the same building. As time progresses, the difference 7dppo8disp y41po 8*+mihiwz7ukc8 *in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building. One is throw ,(tbimwr. :/1 c9p26uyrrgwt rb,pven up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit thtu .pcgvy:/m,2brrrtp9rb w,i6w1 e(e 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. 60)dwv su+l ru:r:zdn+zx ( ajA second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two br+z:sa xv0) uzwj lr( u6d+:drnicks.

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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 q/ xp84sszbw 6constant non-zero velocity in the +x axis. The position versus time graph of this object iz8 w6sbqs/xp 4s

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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 axis. The posinvlw9a, y+ /y8rknmo i9 am4a/tion versus time graph of t9o,/i yw/ln4a 9rna8ykmva +m his 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 +c+yw 83: .t fri(:vjbqauru5cx axis. The velocity versus time graph :yct+.iv5afqr rcw ju: (8ub3of 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:wdei,:jki:xd t vo- ld.a:6h axis. The velocity versus time grte:j vold.a,ixh -6 kd:d: :iwaph 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 versus time2iu3 dezk:v)v 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 ve- 98/u bolfjgsrsus 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 accelervc vd +dnx9-6goyl ruvyd5):2ation 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 giw o8 x/gl -jxvr4c1dn-ves

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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 g.: kpyrst;s44elr6 sjmw i./eraph of an object is a horizontal line, the object is ;rswltes4k6. 4jie :pm. /syr

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position vers:0d hd+uk 5takus time graph of an object is a vertical line, the object is tuk+dhd:k05 a

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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,k3+zxw /fyhd of an object is a horizontal line, the object ish+ k 3y,/dzfxw

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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 line a/ puu:j2f (pjsr4j:lmaking an angle of 30 degrees with the time axis, the jsa uulrp jj( f:4/p2: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 both the distzds9gnn4wv 3z+tw ,pm 3f83kmance traveled and thp zmwv4,mkw8fz3n3n+d 9 gt3 se 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 km/h in still water. How lontgvq5n7t-sx( z. lvk:n w1h 5gg will it take to move 12 km ngnlt:5hkxgvvzs w57-q( t .1upstream 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 milwuz9o )p,j -wy euh01 = 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 iz ; cin6dto3fjnh(2 :y bt86orn 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 2 hours and 57 min. Wy gsc .x:(mfw -z3w2nghat is the average speed of the r2 gn:x (.ymgczw wf-3sunner 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 le4 6g;t w/yo btq+5ywxong does it take for it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that light travels d 24j6rle4k8wt j6h9 rgyn dx0in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609tr w66x njr944kd0d 2 g8eyjlh 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 alont2uo u0ts,t7-bg. ko8ri: qoxg a straight road and you look to the side for 4.0 s, how far do you travel during this ina ,oot sig .ut7-qt82k:0bor xuttentive 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 ar,yg/b t ). ,*tyxjkl6cyiho 7gmet:jb7e2;wy ound an outdoor track (400 m), in 100 s, your average velo *2e7o b;hxjwgkyti)y7tc: ly ,e,tygj/m6b.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 Pole. It travels 1.0pt ( ud-lto+gj71 2t rup)a6aw km south, then 1.0 km east, then 1.0 km north, tp2 a+l1ttd( uupa6 )grot7wj-hen 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 thewx4.d2; a; kfu4b;l zkv1hun d North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west toda;4 nkzu1;vblf4kw.h2; xu d 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 55 mi/h for 110 miles. It thenc9s+mrmg*73me: p/z nncej( s start/ *c( smem9g:3ncs p e7r+zmnjs 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 school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/ove4dm21+xd gkd3 * ldh and 160 km at 100 km/h. What is the average speed of the motorist fo3gexmld d1o+ 2dv*d 4kr 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 yzd4+g(vktj) 5a ym:l and 2.0 h at 100 km/h. What is her average speed for the trip? :jldg)v4y t 5mk+ayz(

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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 then at 250 mrt5.))z8 quvx wiq8e mi/h north for 750 miles. What is the aver8 5ut)rq 8qmx )wiz.veage speed for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorman (the person who runs the last 100 m) for te q6 a)wupq7o k(v5x+biam 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 orde5qw(oaq+biu6vk)7 x p r 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 average vgcl7 iaq/irs ;;)cqm4 elocity during deceleration was 50 km/h. What was the car's deceleration whilm7qic;li)q/src a g;4e 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 average rate**(p tv pvy43mb uaw7e of tbpw4uv37v(p e* *m ya$15 \; m/s^2$. 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 at thew92l b6qe n1eqy :1xng 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 res(c x8e7lg/ d1mbaagm7b n8hs qge:,/ ut 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:/ wfgm0:av9.nc9odyqlzxa6 speeds up with a constant acceleration dacm v :/ qfy6o:l.wgn9ax9z0of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 5.0 m/s experiences a constant accelerati2y1 dxfq(s1-n2dr cplon offdr-s12x pyq1dn2 cl( $2.0 \; m/s^2$. 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 (s60f-z toufs2uvr-k1+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm.rfku- 60vutfo - 1zss2 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 aiv2-ruyy8u w 4nrcraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, whayuvy rn2u-4w8 t 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 , b+t*o:fvp .dokn b+v;wmyeps956 p qconstant acceleration 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 distancny4dla 2j1mg .yqbnarz(do. k *6l/w+e of 200 m. What is its average accele a(k .bj yzdnl ln1o r/4+2*6dawgm.qyration?

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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 accelerat./yvu(e(fy:v wb pv7tion. During the first second it travels 5.0 m. How far will it travel during the third second?. vtf/e pbvwvy(:( 7yu

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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. Initia3 ons y f4iw7n*b;a4b 37vqoislly it is traveling at 16 m/s. Three seconds later it v o4a i*y 3bsb si7nqwfon4;37is 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 uniformly acr7b.i4pv5 v3iw fp 6ct $3.0 \; m/s^2$. 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 decny:rgrgj,c iqa9a )pd2ufnm 0y:57.belerate 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 ljl9 brjo-s n*5ight turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration ofjn r*-o jsb59l $2.00 \; m/s^2$. 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 ogqt ,s8yyt//cf 12 m/s on the surface of planet X where the acceleration due to gravity is /y,ct qgs8/yt$1.5 \; m/s^2$. 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 thpn 22 6i8/9xsnrbnehda0jp th w( muw+1c)/dxe surface of planet X where 2bsw1 /9j p 2axh)nmwcern6up +n(hd 0i/8tdx the 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 --gn q/ s u(m8ixn9wygm/s on the surface of planet X where the acceleration due to gravity ixy sg muwn(-i-/ g8nq9s $2.5 \; m/s^2$. 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 surfauf3lsah vw/(rj;;nu( ce of planet X where the acceleration due to g3jfwnuv ( u ;hl(sar;/ravity 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 u5 now;08zyzik/6ube zsually greater than 0.10 s. If your friend holds a ruler between your fingers ankuezzw0 /b 8 n;i6zo5yd 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 upward at a velocity of 1pz8ohoc*ei.ah5 2*w; ncmsv(9.6 m/s. What is its velocity after 3.0cvo*c;h2me * znwp.(asi58oh0 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 straig8 2ee0k w9hscaht up returns to its starting point in 10 s. What is the initial speed of the ce 908sawkeh2bullet?

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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 long does it take tl5bh l/-f vtlx3) zv.d)mk g6po return to its startil 3/) h 5lxfkvv6-dt)lbg .zmpng 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 downwardx( o j :p(7osv(5inyut from the top of a building with an initial speed of 25 m/s. It strikes t:xijtup(o vs( 7(o5ynhe 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 strai, y 2o3yquig;lght up with a speed of 30 m/s. (only fill in numerical valul,gy qiouy;23e 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 straigzfj.7ei+pvm vx7p2vc1 0wd+ioki)x) ht up into the air with a speed of 30.0 m/s. (only fill in numerical value in x.pzvv) )f+ pd7c7 eoi2vmw+ji k0ix1the 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 veloxq68d7d;r9x - onpjkr pyt-6rj)jt: gcity 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 velocity at t j0kge*o szznjq+m(7t 59a fs+7(scgg = 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 h3( h l*tgt4isat 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 velocj(2zd mh97w9ab f( 9ss6g:g.rxe cs1py:qb udity 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 velocity from 0 to 0pi53wry 2vyrve)m7p:7uk c i4.0 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 avdb46c ,bbw .z 5qm01tf*slgt berage 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 t0a1k4q.: h1sfdfipm 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 the itsr l62( qfn.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 c(,6pq* usknsthe average acceleration 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 txo( 5i-+uksv )l 4y,mzbcjgk* he 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 dispjn71q n3vcru1 lacement from 0 to 8.0 s?


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