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习题练习:Physics Bowl by Topic 2: Kinematics - part I General Motion



 作者: admin   总分: 72分  得分: _____________

答题人: 匿名未登录  开始时间: 24年03月31日 09:50  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  
  10.10: A particle travels at a constant speed around a circulatc:m6kv 4c 7bsr path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance puef ),2d8 r2s ddphzp 6v6vzq3er unit time without reference to a particular direcz2r),6 3 ds devfv 8zp2hqpud6tion is called

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.29: A vehicle completes one lap around a circular track at an av147 t7r dxxl(0fiwkp nerage speed of 50 m/s and then completes a second lap a0xkdwpr41i(7n fx7t l t an average speed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in ((sla t7 urdy25z)3 blddse+ f1.0 s at the constant velocity. If it continues, hs)ud23f5+ l(bldte sdzy ra(7 ow far will it travel in 3.0 s?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.34: A 40-kg boy is stationary on a 30-kg plank that is sliding at 5.00 xfyw(o) ge;q 6m/s to the right across a fr)(yo;q6wfxe g ictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 kmse9:4 ln ka2huq y diup/8n,,o/h and 400 km at 100 km/h. What is the average speed of the motoriskp:y n42au ,9udn8 hl qis/oe,t on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion of a toy car traveling along the xaw uoyv,8:u8tj* pg/gwf m-: z-axis. The graph shown below is a plot of the car’s vj gfy m-8pw*vu ,:wt/8 zogau:elocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers tofnpd9b *is+vj* 3*zjs kxzh(6 the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in thejjzbdv*xfz+ *ph6*ss( 9 ni k3 x direction, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to the motion of a to+bu/*7c 8/zrecf (a 8hjjjsfwy car traveling along the x-axis. The graph j8/hfrj78b au e *jcwzc+/( sfshown below is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
How far did the car travel during the first 15 seconds?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.15: Given the graph of0 ;f 0ovgk/mkx the velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forward motion? m;kf ko/v00xg





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to the diagram below which shows theuts,*ao m7a)y position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocity of the car during thea*)osm u7, ayt third second?


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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.18: This question refer to the diagram bel vb78t6s j cxjd.7r.kuow which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire xbj j.7dr .csvutk 6783 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shape of the velocity time graph for an object with 5tx dou2f/wib,v 9 os/ se,;kwthe position time graph shv te/ud2k9s/oi bs,ow,x5w ;f own in the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following question refer to the fo6emj ,ky2 rrp86b+es kllowing information. An ideal elastic rubber ball is dropped from a height of abous+8je6by6 ,kerrp m2k t 2 meters, hits the floor and rebounds to its original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following question refer to the following information. An ideam),k cruoapta1 h-uj8z79l/z c 4zw(nl elastic rubber ball is droppedzl,h/u9 () 8- ourj4maa1nkcwpztzc7 from a height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a speed ovri+ok n qcs53ngxl zm27:9( b6kb nt4f $v$ in still water, which of the following trips will take the least amount of time.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.01: The question refers to the following scenario: At mo h90etiz g7w(9yfk :$t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
During which time interval would cars #2 and #3 be moving at the same average speed?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.02: The question refers to the q nnyn6, 57+6gdlovly following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
About what position after $t_0$ would car #1 and car #2 have been side by side?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.03: The question refervboo7hz9ze32)gv f+(kcx6 u u,ji15d er9 cwhs to the following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
Which of the three cars had the greatest average speed during these 5 seconds?


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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.04: The question refers to the following sayzg2l/15*-qxa va mdcenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
If car #3 continues to constantly accelerate at the same rate what will be its position at the end of 6 seconds?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.33: A small ball ro3po dov mr2+a /y(o vap j;k1g:w+u*zulls down a ramp, across a horizontal table top and off the table edge. Which of the following would best represent a graph yvd+p/oav+ 1;z3wurajp:oo(m*2kg u of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents the relationship bfc3 :4xdjk6v6 ik :tyvetween distance and time for an object that is moving along a straight line. What is the insta 6k6 dky:vv3c :t4jifxntaneous speed of the object at t = 5.0 seconds?


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.02: The graph represents the relationship pf:s-cm5*noi4nf p 5 lbetween distance and time for an object that f5-silofp54:pm nn c* is moving along a straight line. Between what times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward on Earth ,k)d. j7wupz8 ial8x9sxjq 7c with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the ground jqi, 8scxapd luk7xj) 8 9.w7zis

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below represents fm2kzp8u+ i (za toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the diagram.z2pkzi +8um(f
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy cp3( l 8 80 qmehkt,:oqq/-sz dfuhoc:lar starting from rest and uniformly acceleratinpom -u3so :ft q /0,q8 lhkhq(:eczdl8g across the floor. The time and distance traveled from the start are shown in the diagram.
What was the acceleration of the cart during the first 0.4 seconds?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.13: The diagram below represents a toy car startin u x0n t8k:um1j,559ta 9 esonaetmrp8uv)a+vg from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in tu)jao a ev0u99p +mvn51m:tk r, entu8s5x8 athe diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a g 5su3*kue;vk1 fcs;xuniformly accelerating ball. The position of the ball each secocsxf51gesvu *k;u3;k nd is indicated.
What is the average speed of the ball between 3 and 4 seconds?


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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.09: The diagram shows a uniformly accelerating ball. The position ofmu3gwgdhzy1l /5 0zt kjec64; the ball each eg4gzcm6zulk0j t dh5y w;/13second is indicated.
Which of the following is closest to the acceleration of the ball?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.17: The motion of a circus clown on a unicycle moving in a straighi: w manpz+-zxizj1/ir: 76eb t line is sho6-wa nii:/i7pbx1r:zj+zz emwn in the graph below.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of a circus clown on a unicycle moving iz2gc n+qy;oq hlzyc52 x ,e(o-n a straight line is show (5+qqoy2ecln, -;x yo gc2hzzn in the graph below.
After 12 seconds, how far is the clown from her original starting point?


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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.04: When an object falls freely in a vacuum near the surfajly :rjk/) n(+nt, sx7gllr.kce of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on a table* e81dlu6lnf7 d0cese top for 10 seconds. For which time interval(s) did the marble have a nege l1cs 8e*l70 dd6fuenative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying graph describes the motion of a marble67hs; ssgr.bk on a table top for 10 seconds. For wg sssk;b.rh67 hich time interval(s) did the marble have a positive acceleration?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the m4mis cr0 ruar; u7n9zk60 r+rmotion of a marble on a table top for 10 seconds. What is the marbles r00i r69m+ 4mck u7zn;rarrusaverage acceleration between t = 3.3 s and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerates unxtal7d9/f;eo +8 pyp aiformly from rest for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown straight downwaljz006n9rd y krd with a speed of $20.0\;m/s$, takes $2.00\;s$ to reach the ground below. From what height above the ground was the object thrown? Ignore air resistance.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.03: Which of the following graphs cou2iy,sakwp/ 8a x ckq4y(a 28mzld correctly represent the motion of an object moving with a s4 y8 qa8/cawa2,m2kp i(kxyz constant speed in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying graph describes th8fx ysouq aw;82ahc-m u1x;r7e motion of a toy car across the floor for 10 seconds. What is thfr2mu88ax-7y1 ouh ; xc ;awsqe acceleration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanyinc(7n;k(xcmhfmda /d a*( 3cqksgjd +6g graph describes the motion of a toy car across the floor for 10 seconds. What was the total displacement of tcs( *nm(j/ d cf(mx kh3q; 7c6adgdka+he toy car for the entire 10 second interval shown?


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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.26:The accompanying graph describ hnsam7b+hu* fr*6f ;tes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy car; n6fmuaf+ htb*7*rs h be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniformly from 0 km/hr to 60 km/hr itt.- t *il 8xw8:oevucm.m hn,n 4.50 s. Which one of the following choices best represents the acceleration of the ctvx.:meh tn.8 8*o,l-u witmc ar?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the velocity versus time curve shown. Which of the fola1ts pw5r8 ry+lowing statements regarding its motion is NOT CORREarp518+ tyr swCT?


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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.17: A toy car moves along the x-axis according to the velv;:3(h2,x n pc7h) he tyvu4pfrch.luggm;;m ocity versus time curve shown to the righu ;lme7).g(23uhhn p mv 4fhy:r, tcg;;hx cvpt. When does the car have zero acceleration?


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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.22: During an interval of timel/ )e4igl +dyo mc0ph), a tennis ball is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis lco0hp 4)id/+mg y)le ball during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 150 kilometers apart and traveling toward each otherjr 3 9.ll;osxfd*,cr 2x 1wsxgg;u,gr.gglxj xs os.rc*d3l ;,;f1u 29gxrr w,
is moving at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.04: A particle movecq m5.hm, mmhio-9)gv s on the x-axis. When the acceleration is positive and increa )govhmm9mc5.m,h-qi sing

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definition 2qedxc bh. cb0 zs0;u+of average velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions,i1/.uln c )hyq which one of the following choices identifies quan .)lyhqncu 1i/tities that must have the same direction?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.17: A toy car movesu hwy7g qts5,- $3.0\;m$ to the North in 1 second. The car then moves at $9.0\;m/s$ due South for 2 seconds. What is the average speed of the car for this three second trip?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.05: The position-time, ixff5)lmr31zrxa 8 ,n9zahs6 0z )dkr $y\;vs\;t$, graph for the motion of an object is shown. What would be a reasonable equation for the acceleration that would account for this motion?


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.31: A car moves to then9d/ym+ x ;oel right along a one-dimensional track for total time T ilem/+d xny o9;n two parts.
• Part One: The car maintains constant non-zero speed V for the first $\frac{3}{4}$ of the total time.
• Part Two: The car accelerates uniformly to rest during the last $\frac{1}{4}$ of the total time.
What is the ratio of the distance traveled during Part One of the trip to the distance traveled during Part Two of the trip?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.23: The velocity vs. time graph for the motion of a c54pb7e6a vskjlxra (j/rx798fxke) car on a straight track is shown in the diagram. The thick line represents the velo xxxvep8 raea7) k7kcrl5(96s/jf4bjcity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the mnz kh :9sm0 :7laokq1motion of a car on a straight track is shown in 0ok9z:7a mlq1:ms nhk the diagram. The thick line represents the velocity. Assume that the car starts at origin $x=0$. What is the average speed of the car for the 10 second interval?


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.08: Consider the motion of an object given by the positiw2yu.s zni3f c -ob68hon vs. time graph shown. For what tisyc8 uzifnw .b 63-ho2me(s) is the speed of the object greatest?


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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.11: Consider the motion of an object given by the velocity vs. 3a 1fyqaf 9k(ytime graph shown. For which time(s) i 3y(1akffqya9s the acceleration of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing the area under the acceleration v)- ih3k0qx0cx v 1qymts. time graph for a fixed time interval of an object’s motion, what quantity has been determined y 0q)v03tmcik x1h x-qfor that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal 2(pbq6 igfn6xline with increasing speed.
choices could represent the signs of the velocity and of the acceleration for the object to achieve this motion?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.14: A car makes a trip m 4f7)7cuc(z b.7xm k7smxvn61gcjh kin two parts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.02:A small object is released from rest and reaches the ground in a time ofvq m,sv*4dfg cub 3+1d $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest and reaches the ground in a tim-wzjogb89 7v6 saag/ke of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. time graph of a particle moving along a horizontal axi-a l(a kbyra1 )-hpm8as is shown. What is the total distance traveled by the particle from t=0 to t=10a ly r(a-pm1aah-k)8bs ?


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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.18: Which one of the following choices correctly id+pns1cjew p7g +o( e.lentifies all of the listed situationspj.o+e s +nc1wl(e 7pg for which there is a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an object moving along a line is sho;*v y (ze z-,ah-egv(zb+dnldwn. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from+zzgbzla; yn,hd(de * --(vve its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a lh oknaz gu,6nt0e4 ds 27:wmnh+(i(ddine vs. time is graphed. Which one of the following choices best gives the proper interval(s) of t:uon47nndktia e0dh (6h (gs,+ zwdm2ime for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right on a horizontal track, each withf yy,.)nzt bj; constant acceleration. At an instant of time, the information about the cars is sh;ty,bf)y .n zjown:
Car #1: position = 125.0 m; velocity = 13.0 m/s; constant acceleration = $1.5\;m/s^2$
Car #2: position = 80.0 m; velocity = 9.30 m/s; constant acceleration = $5.5\;m/s^2$
During the next 1.0 second of motion, which one of the following choices best represents what happens to the distance between the cars?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.14: A particle has a posiw3s n.zasryq;p -y3 m3tion $x$, as a function of time $t$, given as $x(t) = -15 - 25t + 10t^2$. Which one of the following choices represents the magnitude of the particle’s acceleration? All quantities are expressed in base SI units.

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.41: For the entire time shown in the graph,/9dr zj+ ;xk+;dj vugk which one of the following choices correctly describes the relationship between the average speed of the truck to that of the car? zkjugr9;+/+xkd ;dj v


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best describes the instqz e levc8) w2 cmj,u,s*t4nn0ants of time, at which the car and truck travel with thj, eumc,vcq0n2 tn)w sle8z 4*e same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start fromnnt4td-qv ,y1 rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of t q1ynt,vtn 4d-he following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph ofq a:pzda58fd i0.dp4g an object moving on a horizontal line is shown. At what time(s) is the objeg 408fiadzq:.p 5a ddpct moving with its greatest speed?


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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.08: A mass moves along the x-axis following the position vs. time grapc0bg); q):zr +ne rwofh provided. During what time interval(s) does the mass have zero acc0bng: z; eq )f+rorwc)eleration?


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