Suppose that an object+1v ,es -hx 4d ewlk(w:si-vaw travels from one point in space to another. Make a comparison between the displacement and the distance travelew-i4v+: ke,wehw1 ( xvasl -sdd.

  When is the average velocity of an object equal to the instantaneousn ;+5lfr ;exds9ee ly90wn0sb8mi /kt velocity?

  A new car manufacturer 0xo+d87p q)p mr6fa fejjh;:sadvertises that their car can go "from zero to sixty in 8 s". This is a descript m0f7f8;dea+xjqr6h)psjp:o ion of

  An object moving in the +x axis m0 cr8(v.j :: gikozniw4i1zyexperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travel6b0osd7un1sna1i l6 w3szf;+ z)i zzoing to the East (+x direction) begins to slow down as it approaches a tr7n+061s;asb o zf6zdw i1uzi o zls)n3affic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x+5 j(vbzuppe)vnb.mq mtl8eemn , 9gn2/ /f:x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratx n ,z jbpnme/9nebl)2vq8f5mg/m eu:(.tp v+ion.

  Suppose that an object is moving with a constant velocit43 :zmnr i-;h w.mpsbqy. Make a statement concerning itnhp-bm4 q3miz : sw.r;s acceleration.

  If the velocity of an object is zero, does it mean that the accelerh 5dh ; bud2mmt:twg99ation is zero? Sup9g wt 2dt:9d;m5hhbum port your answer with an example.

  Can an object's velocity change direction (re(l uiifnc uca ao,w4:-r-wzm13;u when its acceleration is constant? Support your answer with an example. ru(ofw (a-a - lcczuu: r;e4wi1i3m,n

  Suppose that an object is moving with constant i47i ;t8tbdyq acceleration. Make a statement concerning its motion with respec;d8t q7t 4ibiyt to time.

  Can an object have increasing speed wcnn4mk5xv2*p2o n nx.hile its acceleration is decreasing? Support your answer with anc .2on*nxp4mnk n2vx 5 example.

  Suppose a can, after an initial kick, moves up along a smooth hi7* k0xmugq7 psll of ice. Make a statement concerning it s0km *xug7p7qs acceleration.

  Under what condition is average velocity equal to the average of the objz st, jate2/ 0/mv1ldp ,pjvs5ect's inis/,t,t0vvp5pj dm sajzl2/ e 1tial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. H5535h/ l0k i gqwpuypsvg93k kow5upw 3lq /s3pik0 k5vhgg5y9kever, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both stal:ui5ka tzdv-w q(d(a+ 2u +uqrt from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distan: ldivq uzda-+u( a 2t(q5+kuwce traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of fricskr gc:g1of- ,hdsmql 31o+ 2vtion, which of thed3k+ss ohorg:qfc ,-2gv 11lm following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction jch,j7zl-4kla 9v y/t, which of the following is tru/-9,t jc lj4 lzvya7khe concerning its motion?

  Suppose a ball is thrown +f 0mvrtg9 ;nhyjo9 zv1r0)su straight up. Make a statement about the velocity and the acceleration when the m u;9nsv19gf0ro0 vzh)tyr+ j ball reaches the highest point.

  Suppose a ball is thrown straig ,kf/xwi,br r3ht up. What is its acceleration just before it reaches its highest piw,br 3,kf r/xoint?

  Suppose a ball is thrown straight up, reaches a maximuia)r96nr+m q dm height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as na)rmr96d i+q the ball is going up.

  A ball is thrown str 5e1ttwpfx+ v(aight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerationvfp1+x(wt5t e as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a stateyg5ez u*; qhc9ment concerning its aq 9eyzh*5 ;cugcceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accoi *fgsc7p8 g)vhn(3xeleration when she she reaches oh7* cs ) 8vgpngfx3i(terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ba rf8hb8 w )p11kxu6dhull 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 )wu 61fxuhh8k1brpd8 first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One seconyqghg8 s4 .vblqcc.-+b,c;crd later, ball B is dropped from the sas;.blyqchq.g 4 cg,c v8c b-+rme building. As time progresses, the distance between them

  Ball A is dropped from the top of a buipbo3ij bbtwte 2, (8j+lding. One second later, ball B is dropped from the same bu+jw2t te i8,bobjpb3(ilding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall) * d+ezkt2ngo)8ibis building. One is thrown up, and the other is thrown down, both with the same initial speed. What arkot8zgnd +ib) 2is* e)e their speeds when they hit the street?

  A brick is dropped from the top of a building. A sec7quuy q65* g+z ;ibk;ib )y)hwkvg jx6ond brick is thrown straight down from the same building. They are released 5q;;u7x yw)yzgi*ibk6quh+6gv)j kb at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-z0q., ;rvdwbmi16ufq qr )qe3w8jgc0c ero velocity in the +x axis. The position versus time g qi;m r0f. q)wgu rdc31bv cwqe68j,0qraph of this object is

  An object is moving with constant non-zeroy/(xfy fjqfpls0d,rdt 5s25 - acceleration in the +x axis. The position 5f 2lyqdy(05fdf -spjx / ,trsversus time graph of this object is

  An object is moving with constant1m pi82 nwki)e non-zero velocity in the +x axis. The velocity versus time graph ofn82 )mipi1kw e this object is

  An object is moving with constant non-zero acceleration in the +x axcu+bs-vxx;b9:nt.x h is. The velocity versus time graph of this object x xn.hbuv b+-9; txc:sis

  The slope of a position versus time graph git-3u vnu2gd;jb70f ,rp v db6qves

  The slope of a velocity versus1g6cks *h ti0u time graph gives

  The area under a curve in an acceleration versus time graph oa2i2z-lg: mc 5a 7tubgives

  The area under a curve in a velocity versus tz-evs ac2e 28w .uj2ni xel-d3ime graph gives

  If the position versus time graph of an object is a horiz6h ,p 9pu;zastontal line, the object is;ua, h 69pptzs

  If the position versus time graph of an object is a vertical line, theg nb09bdz ixh d1q47xro:1,u z object is: b,g4nqb d7xzzrd1ox0i 19 hu

  If the velocity versux +u :0vkilin ++qnh2mz8k5uks time graph of an object is a horizontal line, the object i+ 5nkq+ iz+ki xh0ln8km2:vuus

  If the velocity versus time graph of an object is a straight line making an anwiz pkr,9zjbj ;l5g dc;td7:0fu6b- rgle of 30 degrees with the time ax;cftd6 - rjg: izkw,79 ;d0jr5upzbl bis, the object is

  An object moves 15.0 m north and then 11.0 m south. F3:3sc 1iq*tte tv4 xsnind both the distance traveled and the magnitude sct341:v sntit3xq *e of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to movexv8ai1*,0 ,l l6y(v/ mlb tuv;hprlc,ux9vwn 12 km upstream /vc8vl y*bi(px;1 ux utl6ll,ar0,9nw mh vv,in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 mag 02lcq*q4-m0e vgv 3o/qscx)

  What must be your average speed in order to travel 350 km in 5.a5,tlrk) m.fn0l6 yaj15 h?

  A runner ran the marathon (approximatelytcv xq gs (51hly7b7j8 42.0 km) in 2 hours and 57 min. What is the average speed of the ruq 578jtsl7vg h ycx(1bnner in m/s?

  A car travels 90 km/brmn2+u t ;yf1;fous2lt2r o. h. How long does it take for it to travel 400 km?

  A ly (light year) is the distance that lig.knu ;ua; vr 7me0eu-eht travels in one year. The speed of light;ar-e 7m u.0ve;nekuu is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight roxk h/mk;j3e/cp rwyck .b8* /uad and you look to the side for 4.0 s, how far do you t;w / c/3kb.x/8uemycpkrhjk* ravel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m),75on aws -z1(aln77 vbkqok7y in 100 s, your average velocit(na777sblkoz5n-yvq 1ka 7woy is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.5 f xwpz9q)z3)vk; *hui(td ut0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the be)3hudzw k(itqz5*9t;fvp )x uar's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 kmqz4c7 q x z9b2iv,mq-c east, then 1.0 km norq 7c mzb2zx9i4qvq- c,th, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend fr5 gewxo)j. rxr7y+ h9fom school at 55 mi/h for 110 miles. It then starts to snow and yyexxj5 w.+ofg hr)9 7rou slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. zt(p ;p l-ic:0 x2 lbpel7ei5zWhat is the average speed of the motlpbt0z l5z-e2xe(; :pi pi7cl orist for this trip?

  A motorist travels for 3.0 h at 80 9q34ql dnxk 2o zu+dbpmw)f;7q .w-i ekm/h and 2.0 h at 100 km/h. What is her average speed forq9lxww; 4)dn+ f7dz pum.i be2-q 3qok the trip?

  An airplane travels at 300 mi/h -4m0cp 8 d pg,:h dm nhge/2b,yq4qlsysouth for 2.00 h and then at 250 mi/h north for 750 miles. What is the am48e pn,g 0b dyh:/mch 2 g-pyd4qlqs,verage speed for the trip?

  In a 400-m relay race the a .z r w9xl vjfhw)c3k+8cqsd03nchorman (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, sx)zwfjw 8cr30.hclk9d3qv+can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 11 s. The car's a hhsux 35.k ,vhh;k)y j5qi4jxverage velocity during deceleration was jh ) 45,hi kqkusy;hjh5vx .x345 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed f o7w q6s.so -fd8aiv6trom 100 m/s to 160 m/s, at the average rate of 7ta8-d 6fsqvos.owi 6 $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accefp f5i;77,arc;p hubnmshb( ;-vnd)slerates 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?

  A cart starts from rest and accelu l*wzl7 2arq+l4p zb0erates 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?

  A car travels at 15 m/s for 10 s. It then speeus9b gt 3*er :op/b3/6bpjtgvds up with a constant acceleration t/bojg upt3sebbp 6:vr9g3/* of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.9 m/s experiences a o.zlo kmpyy;/ga ;q70x h9(ptconstant acceleration o. a0mx (hlgy7/tqz k;9p po;oyf $4.0 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horiw97 ,4tf*zoczlb s2qbzontally to the right (+x direction) with a speed of 523 m/s strikes a slwq7o9 stzf cbzb,4*2 andbag and penetrates a distance of 96.85 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircx7oa/ -locb1 mraft 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 conlox ob/ 1a-c7mstant, what is the length of the catapult?

  A car starting from rest moves 7d(26cjcr uksa, v 1owwith 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?

  A car goes from 40 m/s to 80 m/b0. q (k)czaurp. .h7t ust9pjs in a distance of 200 m. What is its average acc.ub7kp 9 t)(z..hus0 cqprtajeleration?

  An object starts from rest and undergoes unifo2lmlbhn)b *3.qw4biorm acceleration. During the first second it travels 8.3 m. How far will it travel during the ti 2blbqo)nh 4wl.m b3*hird second?

  An object is moving in a straight line with constant acceleratcmf n z3x.ege (+u(.2w99p zuq :uvmqy2k2aoyion. Initially it is traveling a qou.9 +2w(m9pzga2 emuqczny(yv k:2 .3uxeft 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly, uxq6krud *e3 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?

  A car with good tires on a dry road can dece0odkp43ct-p(z;nbq 3u0 oa i 8/ea atilerate 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green tm 6xll*u st *q-z;ma 48rpyj6ps 2/ft.wd5zr, a car that has been waiting at the inp.d48 y;ft2mlz 5 xau6/m w j-tq*ps6*trrszl tersection starts 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.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward w.a9l r /1k5wr7vtku xkith a speed of 12 m/s on the surface of planet X where the acceleration due tor k.1 /vt9r7l5awxkuk gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward w evm 4d30 d5aihv4l x-5j0u4kgv4ssowith a speed of 12 m/s on the surface of planet X where the acceleratiw0sh4 x 4 vui-0 kv5sjg 5md4da43elvoon due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwar dmw4k-c ygs)f;b . ,yg6grl.td with a speed of 15 m/s on the surface of planet X where the accelerati-tr6ymc )w.gs,bl df.g yg;k4on due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on th: jl ,cayknj:+e surface of planet X where the acceleration due to gravity i,lc nykj:aj +:s $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your fri1m.r kf9qn7l kend holds a ruler between your fingers and releases it without warnil q7k1mn. rfk9ng, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity afterf2iq+x mej(lr 7my05 t 3.00 sqf y57rx(i+mltm j20e?

  A bullet shot straight up returns tg0blce7l8 /+:jjsf (go.q r ofo its starting point in 12 s. What is the initial speed of the bullgjgsffj qrb c7 :(el/ol0o8+.et?

  A ball is thrown straight up with a sz*nozq9daets , pu4x3gl)v1gq4z4(v peed of 36.0 m/s. How long does it take to return to its stazd4 qztu)p( vaex9s4, lgo1*4 gv 3zqnrting point?

  A ball is thrown downward from the pqx2;5v-kt jb top of a building with an initial speed of 18 m/s. It strikes the ground afterqkvb2 x; p-t5j 7.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (onlyeypck kvv4j81(iea 54 fill in numerical valuek4ivcve ( k15 peja4y8 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?    $m/s$

  A foul ball is hit straight up into the air w rl)l4q;mgm f)ith a speed of 28.2 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 10 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity ol83b i 6 ozn90ql/atwat t = 1.0 s?

  In Fig. below, what is thb74 aip-hi 7j 2xytp,ke velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0b bjxl( fumf9qqeo/9 c :+9x,i+ c2tff s?

  In Fig. below, what is the velocity at t = 5.kovj9qv8h:x 9 -7kdr n5 s?

  In Fig. below, what is tn .xi7)lwwmf /he average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velociad, g qa7 c b.(agj a,6*xu1djoi7lio7ty from 0 to 6.0 s?

  In Fig. below, what i jdpo0p7s.2 ibemrrt(h; g, r-s the acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3uws 2hccuzxm2cp)v ;o 9 1w6)m.0 s?

  In Fig. below, what is the average ayznpwn;c1u,+ j9 ( wnkcceleration from 0 to 5.0 s?

  In Fig. below, what is tds dmk s*oq3 )62qapu*he average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemnyanaf3fxh k a 8(-*9uent from 0 to 8.0 s?

Does a car speedometer measure speed, ve2ye ub putogl icd ;x3cr-ga1q;,q+ 3gar2 9x)locity? {speed|velocity}

  An object can have a varying speed if its velocity-)/p,xdm g8 j l65b8txzn liwp is constant.

  The velocity of an object can be negative when its acceleration is pp --u;s 5zu;j9hohq rcositive.

  If one object has a greater speq. hs7ty(7of ned than a second object, the first must have a greater accele tqh7 y(.7sonfration.

  Two cars emerge side by side f +ve)o1ay(ui trom a tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed as its ac4e 8mtw.qot k5a kdgo/j5stcx- r*11z celeration decreases.

  A baseball player hits a foul bab4kmj b4,mq4yevk 2x( ll straight up into the air. It leaves the bat with a spee vkmm2 yj4,(4x4qbbekd of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happening to h3x*wq7)7 iap6sizrcps x7du*u +9js its acceleration, how does it change if air friction is igx7i *q)xi+6pu9pu7cs3 sr7w *szj h danored?

  As a freely falling object speeds up, what is happkm ;k )-pem+f vg41fszening to its acceleration, how does it change if air friction CAN NOT e;v+1 smp fg-kkm z)4f be ignored?

  An object that is thrown vertically s0e p53leg fddu:me 6wbgj)5 +upward will return to its original position with the same speed as it had initially if air resistbe g65+ele0gd 3m 5:s)fpujdwance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the3mefmf q3s4lm 2 qpr06 same time.

  An object can have novw*ncb lnf81 0ue79iv nzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floorox mqkl u( zt:9v/2od92gpl6b making no stops along the way hbkt6gql lom 2:dou9(2zxpv/ 9as zero acceleration all the time.

  A rolling ball moves ffn irlx *:*)tgl;(mz0l- rvnarom $x_1=2.3 \mathrm{~cm}$ to $x_2=-6.7 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completfg z11 nhfbhrr4-rbv-xn( r,1 e laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, moving 86 m ap(eqfq iyf;6..j eggv: pz/u) e6 stytl 1fd43way in 11.4 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its averapfdzy 3ege vtqy6;e..1i/ :utsqfl)6jg(fp4 ge speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates from cfv ,ti68muov8-a /zq/,vnbu $10 \; m/s$ to $24 \; m/s$ in 5.0 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down fromkp, mkcur5((o $17 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s 6hj;tou uwx4q5.1wt xpeed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abou+k h)smwt6vc3t h +m sw3v6)ktc$10.6 \; m/s$ in the first 12.9 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speed o gkewmu- g:87cf $20 \; m/s$ to rest in 5.87 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, akum(qyb9pl:r(nc yt m2r c5y)w/r, 4a car leaves skid marks 92 m long on the highway. Assuming a deceleratrk (m rmu9rbpy/act5c)y2ynw q (,l4:ion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi 5+:9/g2epkx(z*nhv6easq y tg 1irk ong $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than 37;jwfb h;+wig0.0 min. After exactly 27.0 min, there are still 1100 m to goi;gbf7jhw+;w . The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$