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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: physics   总分: 98分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels from one point in space to another. M1)hdo moee 9e95jz7oeake a comparison between the displacement and the distance travezoo5em)do91h9 j7e eeled.

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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 v 3fh mo 8cky8qvm:4r0tay od(loq5(y:elocity 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 "fr3n tqfbg qi90(om zero to sixty in 8 s". This is a d3q 9bgin(0ftq escription 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 -3j cytsw2,v*c )y oxiaxis 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 trav; e;b lmmmz8,d4k9 atneling to the East (+x direction) begins to slow down as it approaches a traffic ligh;n,k l z4m9m;dmaebt 8t. 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 (-x direction) begins to 9mmmt1 nc0p2sdv wh7y pm0b.;slow down as it approaches a traffic light. Make a st00vm ;sd b7 hmcwppy nmt2m.91atement 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. ) sx*b3(r w-3ynfnkhw Make a statement concerninnhw *wrskb3n(xyf ) 3-g 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 mean that the acceleration ws9w n nh/ 1yem0o ,,vc. ae4b+o.ribgis zero? Support your answer with an exam+gybi,e 09emarwows. nb 1h/,.vc 4onple.

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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 changu9spsm-0vh:kk 4. hyle direction when its acceleration is constant? Support your h-.mv ylukh04k :s9ps 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 object is moving with constant/:))wig az yjz s 2k, .esp9fs2*zbwnt acceleration. Make a statement concerning its motiow/ny 2,2bp skfwsai j) .:ezsg9z*t)zn 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 increas,.o );n70zya2oky 9 pghyoabqk7c8pding speed while its acceleration is decreasing? Support your answer with an exam do a0yq9pnp),7byz 2akg8ocy7;. ko hple.

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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,eu,g;o.5x7ac5, pub xecm c+ p moves up along a smooth hill of ice. Make a statement concerning its acceleratio 7,bu+m 5cc.eepxcpx;o,5 gaun.

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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 atdg-8r;csg;,vzdm / initial anrs gmtz;8ac;-d vd,g/d 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 both accelerateq-s mgd77rm v-cp 6tiw7g/+tkchp9 h3.; ypru at the same rate. However, objecr/h m cpy dh7-v7 ; 3m7ggc9w6+tpptq-iskr.ut A accelerates 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 y-t13lq2ur78hzo r m pfrom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A cq7rylt 8r omz 3h1-pu2ompared 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 * u4 4zlz1iy x 2 ;cpkhwt0n(c0+limykfrom rest and falls in the absence of friction, which of the following is true concerning its 2 1k( cuwy*ncziz4l4 hy +xlpi00kt; mmotion?

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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 tp7.c b .a,lsdi.,oi dckze i u+glkv32(v/wi)he absence of friction, which of the following is true concerning its moti3c/)7kvibdl aesg+ d.vil2ku ,wi (p.czio ,.on?

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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 db-t n :p1jv-kup. Make a statement about the velocity and the accnjd1pkt bv -:-eleration 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 straight up. What is its accele fmdv +*c - ;mnd7z3ggej)x8keration just before it reaches its himvg7m +)zjd3 8 cg *exk;en-fdghest 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 to 6cu1 vs:kt4)bcg7yv j its initial height. Make cvy7 gt:61)bcjvuk 4sa statement 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 maximshbf ph*xnvcn2 zn 1um9ma+j l2:3z0*um height, then falls to its initial height. +v:j2snha2*pnm91m x0 f cz hlnz*3u bMake 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 downward in the a(n3d3ip m5l cumrze2u(yap, 0y7gq* c bsence of air resistance. Make a stateme iyppz3(732dqg(cnu may 0, *rmleu5cnt concerning 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-flyingotpa8w- 6gysn+6. vk q plane. What is her acceleration when she she reaches terminal velk+ pwg.66 yas-ntqov 8ocity?

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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 identical second bal.2 ql9 ;t5me)wcaw uhwl 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 does the second ball go than the fi9hla;m5qtu)w .cw ew2rst 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 build7e7z sq1hbt x)ing. One second later, ball B is dropped from the same building. As time progresses, the distance betweens1 zq7xbet h)7 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. Oner d9:eqikxe he11+mk 9f zxjaqf2,l81 second later, ball B is dropped from the same building. As time progrfk9hk9 iq:rx mje e1ex8+2f1zaqd1l ,esses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top oiks/mfzd +as-kk09x 1 hys/pmh+)1fgf a tall building. One is thrown up, and the other is thrown down, both with +d i-pzkky1hs as/k9mm)/gff10 shx+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 brick is thrown 7e 7 4)6168cvpw gvlpoigepod+b u oc*straight epl8 )pdo+6w7oo pc41 67igucvbge v*down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axis.y i..6k e+eoky The position versus time gyo6 kke ey.+.iraph 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 with constant non-zero acceleration in the +x axis. The t zhun b;qvh.m8h (;2oposition versus (. mh8onquz vh;h; tb2time 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 je 6p- nx:nhvn-;lj7hw (l ;6yfc,h tqconstant non-zero velocity in the +x axis. The velocity versus time graph of th-q l;;hftnln ce y(j:6hpxn6vh-7, wjis 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 ths x s)e;1ck-lte +x axis. The veloc ;s1)klxe-s tcity 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 ve i4 dm5;9zxv z8b6t/x6l+vsihcw 0ml frsus 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 versuxp/(1fdyit ;x(xe8 vas 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 a62.gbi qjgy:npr8o t 7n acceleration 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- k yrc9x3b49 i5-vmpf5dvy e.9 m52f dthtuaa 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 tim- 1sds rc-enx9e graph of an object is a horizontal line, the object nx1ce9d-rs -sis

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versusl:gj n3kym8yn/1lwi ; time graph of an object is a vertical line, the object isg8k3ywi;l/1 ymnnl: j

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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 horizonta 0mogy0k9i-zauqzx* .l line, the object u*kmxo-00 izqyag 9 z.is

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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 stralpwo2u/ri+x luj0 al a26*b1rz1 yh: night line making an angle of 30:ulxiy0 jblaur2/p 16o2wh1n ra*z+ l degrees with the time axis, the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 11.0 m south. Find both qp0 d+u( xp1ibthe distance traveled and the magnitude of the displacemenp ix0d(1pqb+ ut 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 ward +gj2ubt)z8*be ;s mter. How long will it take to move 12 km up8zbge2* )b rds t+;ujmstream 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 = 1609 m)v63dhw pd7k:et+dky*

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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 travelr0b;hn3k9 y vg: f)dvy 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 (approximat4 39qpxoxaa o9ely 42.0 km) in 2 hours and 57 min. What is the average speed oqxa3o994p xoa f 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 lon ;7m d5eyxxu .r4sir)ng 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 xf:a+kx)akk ,,zrx9v distance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1 xka fvxr,k)k+ x,az9:609 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 along6)jn++ gw4e/spuirj -8 uzpq e a straight road and you look to the side for 4.0 s, how far do you travel during ts- epnuj6 uzq4 ij/g8r) e+wp+his 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 x1lv0l bkib se;3 /iuf.aqe *:an outdoor track (400 m), in 100 s, your average velocity iii1 3.fk ql*vbael;ub 0 xs/:es

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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/ .og4agt1pauawnxa0n+hi6v- . fu y. North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 kmh.. 6a 1anto-0 +fu/i4 n.apavgyu gwx 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 1.0 km south, th)ojcphfb9z15m9a5 o y* aj 6ezen 1.0 km east, t16pj*azbh5j za9) 9oc5 yofmehen 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 5 ,g(:j)jv8y2pe-vy 9iookig2jkwq * a5 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home)(yviojp- v: 2k*ia9g j8 eq2,ogyjkw 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/h and 160 km at 100 km/h. Wha(lpgo )w4sm a,me 7d:kt is the average speed of ta4(p ) m:wo ,md7sglekhe 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 at 100 km/h.mtm mug 3cvz:cx- 6;0j18bpq j What is her average spe 8u;mzjcb63pm0:t qjx vcmg1 -ed 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 2.00 h and then at 250 mi/h/-u:yytdag2,rfv f n1* l s+ss north for 750 miles. What is the average speed, tlsfyuna-1 +/*sgfy :v rds2 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 lj;ul7x j0+mqsast 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 ofqjju7s m l;x0+ 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 3a d;chnc:8uy 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration whacd3h :y;n8cuile 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 100f,w rbu4zonqw .vn.(t0 i7a8s m/s to 160 m/s, at the average rate of w.t(zf 0wnus ioq r7n.a,v48b$15 \; m/s^2$. 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 the yy :thf nmfa8ru*k1 ,cy.1;op 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 acceleratesf4nucf +q6hp8cx( b1u 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. r lpx 3p 2*h8kb;ussr6 It then speeds up with a constant acceleration ofhp23rbpxs;u l sk6r8* $2.0 \; m/s^2$ 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 acceleratihbv 2m1k )bjoi50iqk +on of0kb1jb qoh2m5v + kii) $2.0 \; m/s^2$. 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)fci /vkgq5. o+sf72h c with a speed of 500 m/s strikes a sandbagvg. 5ko+q csi/fh72 fc 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 aircra*g;bwdaak - )v1qaic 3x5*x iuft 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 consta bgi*c adai-kuq3w1;*5xa)x v nt, 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 wl*hc p r1g2 s-wb8x0atith constant 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 distance of 200 m. Whvy((ov6z*(3k ar frxxat is its average acaor r6(z3y(( xfxvkv*celeration?

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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 undergorhs)9k 5tas 1h(iur3t x:k/mvg -rp.ges uniform acceleration. During the first second it travels 5.0 m. Howuprgxrk /)am-khh g (v 9:.tst1 r53is 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 straight line with constant acceleration. Initially itlm,)xe 1vx /xt iv1/t,e) l xxmxs traveling at 16 m/s. Three 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 accdep)q;p kb +0delerates uniformly 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 tireshez s3 efcq+2 5.k0qf+:snn vo on a dry 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 lighth4qwnl20en lv.jr,zc ; vmt:5 turns green, a car that has been waiting at the intersection star4rw .vnz,jmvl 0 q;ec5n2l: thts ahead with a constant acceleration 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 wi+2pze g9 y*.tapzh6beth a speed of 12 m/s on the surface of planet X where the ac9eza pt6g2hyeb pz .*+celeration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 1p3dd; h/ftrs 22 m/s on the surface of planet X where the acceleration ds 3 pdf;hdr2/tue 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 tk:+n3l.may*kp4fia,36ng/xdsq7 r s knvi 8qhe surface of planet X where the acceleration due to gravis a k6k +k3m4f/xqr 8ina*s7pndgqli yv,.:3 nty 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 planesxcc kvj91+ w/t X where the acceleration due to g/c swkc 1+9xvjravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friend hold(anpmb8(ba jm 4kqm+eio*d0, m-aqr1 . hs 2vks a ruler between your fingers and releas 2 o(vd.,q jpr4m +kmm8ba 0 i-aaqem1k*hn(bses 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 19.6 m/s. What is its velocity w7* 4dnjmzxu)after 3.00 d4xn7*w) mzju 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. What is 4q9jeo yw5axa- jw48othe initial speed of the bu 54qo4aj wox8 9y-jewallet?

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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 uxvp byf;,k :(with a speed of 36.0 m/s. How long does it take to return to its startinb xp(,v u;f:ykg 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 with an initial speed ofhq); ,jl b:qvd 25 m/s. It strijqdbv: lh,) q;kes the ground after 2.0 s. How high is the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 3e/ fqj .t .5tb cj0j*5.wqndlj0 m/s. (only fill in numerical valucldjjwbq. 5*/ nt.q ejfj5t 0.e 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 strk b3qnqle* 3g.zct6 cqi yn,9.aight up into the air with a speed of 30.0 m/s. (only fill in numert6cz.c9ign. y*bq 3n,lqq e3 kical 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 t7nd* j07urn2opni *pu5 h v;eshe velocity 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 tx6 yig)z 6+rx 56bcsub = 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 velocf:89px mf -mncity at 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 tz-y u .hv*o, c*fgmg1lfb2k);leabx; he 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 velocity pu: gjg u7t9t*+,v asd*pa( ikfrom 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 averas*dhj(gz.ay 33 .t-y cr tc0fjge 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 is51b jv nje/1ngwhm:pwx;.x x5 the 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 acceleratiuve-s o/ isrpuxbek:p6j, ;78on 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 5ymdf;s+ j7:.ye1lggisb z1/ y.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 acceleration up-sz dild)ugw2-l tu.8m3 -nfrom 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 displacement from 0 tenyp6; q -r/z9xm,icbo:g0 y/i bcdk7o 8.0 s?


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