Suppose that an object travels from one point in space to another. Makezzh; dpu k(1dfz*3h :m a comparison between the displp:1 kzmd;* h fh(z3uzdacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity?y1 tlz ) w ap52ozkp.,)*shnus

  A new car manufacturer advertises that their c+ xatitu7: v4jar can go "from zero to sixty in 8 s". This is a descriptx+vt:4i 7taju ion of

  An object moving in the +x axis experiences an acceleration ofp4o:pu5xh99 y(klo f x $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow6f61y 5b w kxnpbc7hk/+w- x4echh8c icqim-+ down as it approaches a traffic light. Make a statement concerning its accelerat7y46-cb k1nkwfwi8b-+ hchixp6 em 5cqhcx+/ ion.

  Suppose that a car traveling,wv-ge/8oxtt j1des: to the West (-x direction) begins to slow down as it app:/x-o8td ,jwsgteev1 roaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constatscz4 ma ua2( htdq0+x,mv+ 0tnt velocity. Make a statement concerning its acm4,(hdu0+c attq tvax+s2 m0z celeration.

  If the velocity of an object is zero, does it mean that the acceleruas tmrn(k 9*uz *yc;)ation is zero? Szruu;ys9t)mak*( * ncupport your answer with an example.

  Can an object's velocity change;i.b .yaq ohh0 direction when its acceleration is constant? Support your answer with an exam0; i q.hoyhb.aple.

  Suppose that an object is moving with constant accel .bd(.9s+e p(axea tw5pt (lr ohi6xh,eration. Make a statement concerning its motion with respect to 5s,+(aaw lh. .xip((dtbetpreh9 ox6time.

  Can an object have increasing speed while i)a+i mdg1hxjutl20 t* ts acceleration is decreasing? Support you* atmi0dgj1 tu+h2)xlr answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth6j64ycn *rffzby3( t o hill of ice. Make a statemenb* yrz tfj6yf(c46o n3t concerning its acceleration.

  Under what condition is averalx+e n0c(jyg2fkbwr3k*75 a dge velocity equal to the average of the object's initialxw5l +(a07knebjk fyd*c2r3g and final velocity?

  Objects A and B both start at rest. oxdm.9 ,qdh-*6jh wnd They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What isd9n,j oqhxw 6h-.*mdd the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both a.:7l4zedpp;llvy08z q tf c;yccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance trav4 :plclzldy7z0.p;q t8 ;vfeyeled by object A compared to that of object B?

  When an object is released fqf )pzh80v h+ u5f8lr 99kmcp5xhtp8srom rest and falls in the absence of friction, which of the following isl p zf kq8rum5pfh9+hs0)885 9pxtvch true concerning its motion?

  When an object is released from rest and falls in 2e+2u.hbva p7hxx4 i pthe absence of friction, which of the following is true concerning its mot+x 74i uvp2ah b2hxe.pion?

  Suppose a ball is thrown straigh ))v ;(2jpem2 6plc7fypgpmk it up. Make a statement about the velocity and the acceleration when the ball reaches the highefplpi;(p) 7y pe2mvjc) 62kmgst point.

  Suppose a ball is thrown straight up. What is its acceleration just before it rvibn8 9aoox 1; q/ lcfj:,l:nceaches its highest poiq 1 ovloan9 : j/;bnf8:xi,cclnt?

  Suppose a ball is thrownom o14; w;cszp straight up, reaches a maximum height, then falls to its initial height. Maksz;1pco; 4mwo e a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, thenhwg1d o*x5bwk cu.)cqr*jw ;w95te 3p falls to its initial height. Make a statement about the direction bc35tw5q9wuc) wr;pg* k e*wohd.j x1 of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the r82m mee, htb4hq m6+zabsence of air resistance. Make a statement concerning its acc24mhm8eq ,h +tmerzb 6eleration.

  Suppose a skydiver jum(5iyu)t ,xlts wzp fg th;he4:ss8n;8 ps from a high-flying plane. What is her acceleration when she she reaches terminal v;tnpgf(hte;8x4zhu:l5y s8s)swti, elocity?

  A ball is thrown vertically upward with a speed v. An identicah,daz +dxkn/; l second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go thxn;k/azd, dh +an the first ball?)

  Ball A is dropped from the top of a buildm9: e5liprg ; mazu3szlk,i,8ing. One second later, ball B is dropped from the same building. As time progresses, the distance bea izu;9,zir:5 g 8m, pkle3lsmtween them

  Ball A is dropped from the top of a a kt2u6d,4s hkbuilding. One second later, ball B is dropped from the same building. As time progresses, the differenc,62udks k4athe in their speeds

  Two objects are thrown from the top of a tall b0-no/upd k fgq4kzxv4uk e t .02c(rh5uilding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit thekx ku tn q-k/d024vfceuo.(h z504rpg street?

  A brick is dropped from the top of a building. A second brick i6hofkvq 8o jjke n-4 kmswx8:o: g*x-*s thrown straight down fro xjwoq-eg*mfvok * 8 okxkhn-:4js:86 m the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zeroj/( no0 1kr ,,dxjokcb velocity in the +x axis. The position versus ti1/, ,c0(okdkxo rjnbj me graph of this object is

  An object is moving with constant non-zero acceleration in th;whi, o0 hi 7i+lrsl68:f58ixqxc fgte +x axis. The position ve w7xfxic f:ihhg+o88 is,irq6;l t 50lrsus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axic mywajn1:vou k2iy0/v/ 5ft5s. The velocity versus time grvmi wuy/ navt505y j1/:f c2koaph of this object is

  An object is moving with constant non-zero acceleration n 9u acy (a 3azi x8;grkud 9nd/uu(6+a3lu:wdin the +x axis. The vel(i d9xkuwau r;a(uzu 6ld n:u89 ndcaa/+3y3gocity versus time graph of this object is

  The slope of a positiasiqo u7j9 kk 036glz::6xhvxon versus time graph gives

  The slope of a velocity versus time graph gi q(/kdeknl03bpvgub 0k i :/(wves

  The area under a curve in an accelerat9 i5mri30)ru;9wdytus sx f l3ion versus time graph gives

  The area under a curve in a veloc86zu5;v5bbp )yrm fyzity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the object b3ff; k;nqzo0t bad ,7 ye;wl,sc9ty,iss;a bz,q0f,t3k7, yld f ey9nb;wo;tc

  If the position versus time graph of an object is a vertical lj jz),e,3-apvjml9c bz 76l,d bswcn 0ine, the object is,me3 d0lbz p-sn)7jc, jajl,v cb96wz

  If the velocity versus time graph of qfd+tu/l4h. ban object is a horizontal line, the object iqbfudl4 /t .h+s

  If the velocity versus time graph of an object is a straight line amq8d4sn5 a7g1ctp a6uu;7iqmaking an angle of 30 degrees with the time axis, pqu17ang8 im q7a45a ;u6tdscthe object is

  An object moves 15.0 m north and then 11.0 m south. Fi -9apjy13r feo6+vli1pcxx/r nd both the distance traveled and the magnitude of the displacemea/y11re r+poxpi9 3xf6-c l jvnt vector.

  A boat can move at 30 km/h in still water. How long will it take to move 1 3qsa /hupx-j*2 km upstream in a river fl-up xsjh qa/3*owing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi mbtvk + :psn34= 1609 m)

  What must be your average speed in order to travelh r*,u8w v3sx ma/ug2d 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours a7 /dwvswhhrdej5: l2*)u p 7xgnd 57 min. What is the aver7 / d52vu e*sw jlpdgw7hxhr):age speed of the runner in m/s?

  A car travels 90 km/h. How long does idrn(* e.g1j :ygqg:zet take for it to travel 400 km?

  A ly (light year) is the distance that light t -brex4 nzl-g 4(ld 1w.pdc5ucravels in one year. The speed of light i1cdz p.dwc4xl4 (rnbg u-el-5s $3.00 \times 10^8 \; m/s$. 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 roadn kc wl./dl p*hbpn)ir6kqp;df dh/04i: g:-r and you look to the side for 4.0 s, how far do you travel during this inattentibknkr)d di/;:4pr6-.0 qnphlpw lg:*/f h d icve period?

  If you run a complete loop aro/q9k*htfjji 1 und an outdoor track (400 m), in 100 s, your average velo t/ij 1k*hjfq9city is

  A polar bear starts at the North P:f (.ku 4g)nb k8/f orkl d1ffufmu,0tole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to retr f ff41k)m/kudutf u8.bokf n:lg(0,urn to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km southiz4b pvtp/+ndx)8 pao *;eeq n +p:vd5/)hixy, then 1.0 km east, then 1.0 km north, then 1.0 km wes tpp;nxi ve5x4bq+p)ydine 8+/hz/a *: )dopvt 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 from school a4u; pk )rbcl gmqv:27f nt3,:/fqwuxvt 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrivew,v r7 )3 f::kqplvfu;xtgn/ mu2cq4b home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/9jgndu.*j g1 zh and 160 km at 100 km/h. What is the averagd *jz n1g.j9gue speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km:tpl :o(bu c4a/su.2d6q s p*h sz.hit/h. What is her averdlst:/isp4ahoh 2q.u *s uc6:z .tb (page speed for the trip?

  An airplane travels at 300 mi/h south fj q-gv8mh nl.oat//(fg5 /kkgor 2.00 h and then at 250 mi/h north for 750 miles. What is the /o -t kql/j8 (g.nvmf g/ha5kgaverage speed for the trip?

  In a 400-m relay race the anchorman (the person who ru+qy:pb)1u ;2gjmwn8ku : xjez ns the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the lar :; :gpz kw exunqj18j2muy+)bgest 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 uniz seid.oil -;5m 0wwa(-qy 3:cyvlm,qformly and comes to a stop after 14 s. The car's average velocity during deceleratioywcl(wi.:e , 50qyd;3i- zlmasoqvm-n was 36 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at t0qp, sc9k)vki he average rate of kv,9s0 kq cpi)$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at th2x1oz0bas o:)wy9dhqe 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 accelerate,1g cj)les(tjq,h(duph6 l- ys 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.bqt8y9n*mnpq w +8 vt s. It then speeds up with a constant acceleration o 9 .nbvt wnqy*88mp+qtf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.2 m/s experiences a/v3z3 jn: .rz xz 2e,k sksr)39qiohktzvr/o, constant acceleration o /o.re2orzxz/,3ikrss:hvzk)v,9 k 3jq3ztnf $2.5 \; m/s^2$. What is the cart's displacement during the first 6.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) wit 2bu:/3vacx:o sjidx+ h a speed of 354 m/s strikes a sandbag and penetrates a distance of 2v: sxu3ox cbajid+/ :66.91 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft cayh bm/l2 iu /x;s5vg mq--sc2krtie2 ,rrier. It reaches a speed of 42 m/s at the end of the catapult, and tc2,er2/ym2s m h/uil-kgs5 b v;-tqixhis requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves wi+ti kt0cj 8h9tbw7; qmth 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/s in a distance gst/kuufox; z16fb; nwfhfv12 . 3vv 9of 200 m. What is its average accele./f21z vu gwuk3n fsho ;ftxbf;9vv61ration?

  An object starts from eorrp u6*tyv-y a:8d 8rest and undergoes uniform acceleration. During the first second it travels 2.0 m. How far will it travel during the th yrv*:8e pu-ty6 rdo8aird second?

  An object is moving in a straight line with constant acceleration. Initialn,mz*pre 5nh, vot*h*chq4 o4 g tyk;(ly it is traveling at 16 m/s. Three seconds later it is traveling,gp*h*t qkvz enor5ym (*t,h 4;c noh4 at 10 m/s. How far does it move during this time?

  A car starts from rest and a2nvyn:m 3 ,9ic m8)hdwp :srkmccelerates 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?

  A car with good tires on a dh-wmn2y.v+qu6q z c5t.u/ft gry 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns ksf,p6 mhn4mcv0s,9q u5p tt0green, a car that has been waiting at the intersection stftv06 ,0s pc4mtqs5muhpn ,k9arts 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 with3rxpno*/o 9g- x0,(ikpzde tt a speed of 12 m/s on the surface of planet X where the acceleration due to gravity e9xz (3*0p,rixodk-p/o tg n tis $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward w ;oba9j y*k8clith a speed of 12 m/s on the surface of planet X where tkayj lb ;8c*o9he acceleration 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 upward with a speehe v5+hl(2jth d of 15 m/s on the surface of planet X where the acceleration dhh jle5+2 tvh(ue 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 speel (w549mqs x9cu.5wpmpps5zod of 14 m/s on the surface of planet X where the acceleration l54spwmpsc (9oz q.9 5pwx 5umdue to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If y hgc; +fm3.hudour friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch ihf+h ;gu.3mcd t?

  A ball is thrown upward at a velocity of r2gui:vav3 ) 6qdl*jz19.6 m/s. What is its velocity after 3l36*udrv: ai jv2)zq g.00 s?

  A bullet shot straight up returns to its startiy7r 14y8 ,g/mj08on 7bao mjswqpkuq*ng point in 13 s. What is the initial speed ofymr n/ujg87k8,7ooms q1 0b4p wj*q ay the bullet?

  A ball is thrown straight up with a spee3 zkn q;;ri.yfd of 36.0 m/s. How long does it take to re;fy qkr i3;.nzturn to its starting point?

  A ball is thrown downward from the top of a building with an initido7)vdjkf ng 4a1d: n;al speed of 17 m/s. It strikes the ground after 4.vdo kjf7n4dn 1g) ad;:7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fillyuc2lu5t 73ol in numerical value in the blu3 t2cly7olu5 anks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up into3/q - xtzzr5sp the air with a speed of 36.3 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t 6fc8xaylj m;.= 1.0 s?

  In Fig. below, what is the velocity at t = 2.fnzr .ov q(1m/zs3fr i8e6io.5 s?

  In Fig. below, what ijax9s6gr i wct91q)z2s the velocity at t = 4.0 s?

  In Fig. below, what is the velocity o,x9ub:u4vch at t = 5.5 s?

  In Fig. below, what is tj37mh1uem yu+0+q g xphe average velocity from 0 to 4.0 s?

  In Fig. below, what is the avera l33h/c b- k-gp:apdd.qti oh(ge velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at +j 2(b rx0oje 1+t/twff;mkr/6ityi n1.0 s?

  In Fig. below, what is the accelerat z1c.ns+cnv 79/bssf iion at 3.0 s?

  In Fig. below, what is the average acceleration fz88(- -3pbgfau cjvx wrom 0 to 5.0 s?

  In Fig. below, what is the average acceleration fnzj5uczyul* x+;+r ygo67bz6v4e ok6f3x jy:rom 0 to 8.0 s?

  In Fig. below, what is9g f; upc*krnyj-w(hx bqo )), the displacement from 0 to 8.0 s?

Does a car speedometer measuret)x;,pbora .rrp4k x)b.by f * speed, velocity? {speed|velocity}

  An object can have a varyi 88s w+b7yghfong speed if its velocity is constant.

  The velocity of an obk8ni7zj c3a)4 uh o3b2ade. zsject can be negative when its acceleration is positive.

  If one object has a greater sp.k6nagqci8 i3 eed than a second object, the first must have a greater acceleration.3 c.kni q68aig

  Two cars emerge side by side from a tunnel. Car A is traveling witho3n.y,w c91y.mbe+nzx;s hc k 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 s/hv7ebhyfrdcbiyg9r f +4( v1c u.x+8peed as its acceleration decreases.

  A baseball player hits a foul ball straight up ipf) x6 -qw/utbnto the air. It leaves the bat wixtw-) pbuq 6/fth a speed 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 its acceleratf4 p hrot 1yf(zx7t1t;3l3l teion, how does it change if air friction is ignor7t;tl o ypx 4(1z3f f13ltrtheed?

  As a freely falling object speeds up, what is happening to its accelera;9pkucv3rd am 1 ny5ym93mx+y tion, how does it change udmyy3 5an9c39vykpx ;+1 rmmif air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original posituegopexrx- wk:s94 o4 . drz-;ion with the same speed as it had initially if air resistance is negligible. If air resistance is appx sur-94zodgepo.:-e xwrk4 ;reciable, how will this result be altered?

  An object can have zero vel -haj2 3jbt5 +,wagjtiocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zeroky9,o.zlxey2 v89ht-uyni7v acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops tgf 9(b1 6btbcgx q/a*along the way has zero acceleration ab a(g*tc xbf1bg/69tqll the time.

  A rolling ball moves fb.z+ 1z.cfu)ce4 ngr lay//kzrom $x_1=2.2 \mathrm{~cm}$ to $x_2=-4.6 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laa l ez7/tj53d gg;37c z1rmovs2.kn cjps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.7 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, mou i w.hjl jd,ys783hl9g7cbl(wu(7fjving 104 m away in 12.6 s. It then turns abruptly and gallops halfway bal7 w ujslig3h8f7jy j(b(ul hw,7cd9.ck in 4.8 s. Calculate (a) its average 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 froo io ;)3- ,djcmacfj6em $12 \; m/s$ to $23 \; m/s$ in 5.8 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 fromnk:x, p ub )0pdcvi.*v $21 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a rjhe22srcr;0- s;n /x*d cei54u mcivspeed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of f6f2lfg ehi49i te:4eud y)dlh1dz:; the blocks to essentially top speed about d414 6h: y: teli2f)ehilz ;fdgu9fd e$11.0 \; m/s$ in the first 14.9 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 fro,)nggq 3k5g xvm a speed of $19 \; m/s$ to rest in 4.04 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long kf.-: c 5icv2cjn r*zhon the highway. Assuming a decel*r c2c :.5hc-jknizfv eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goisd4 2:ujql 2 yr84zzbkng $25 \; m/s$ 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 30.0 min.ugprw(y:t vs2+7* flg*hvl/ l After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate atwl*: lu 7tf*v2/ rgh+v gspy(l $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$