Suppose that an object travels from one point in space w28fye+djoo8 bupo9; to another. Make a comparison between the displacement and the distae8jfuby d op8o92+w o;nce traveled.

  When is the average velocity of an object equal to the instantaneous aoou/w:p lw2-velocity?

  A new car manufacturer advertist ob ujo w,vj0- (-hp39chouim8p;l .oes that their car can go "from zero to sixty in 8 s". This is a descrh-voj0iuwct.3 o -bupj8lo9p;hm, ( oiption of

  An object moving in the +x axis experien :drtc2p9;cm dces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begl3 s7 mkq gz/g3 /jn9f92/cchxya bhg5ins to slow down as it approaches a traffic light. Make a statementc93cq/ zm hn gjybf9 xg2g/k3/la7 5hs concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dea4x,y, /mz4 jd7zgwo own as it approaches a traffic light. Make a4 zgoj7dmzyx4awe,,/ statement concerning its acceleration.

  Suppose that an object is moving wc ik9w4zmw1hzbj3v0554( sgtp t7 qrxith a constant velocity. Make a statement conc3w qi(9xrjgh t1554zbwcv7m t4z0skperning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zer*+*rlzc5yc o co? Support your ans lzc+r5 *c*cyower with an example.

  Can an object's velocity change-kw2 m9hlo)a8m q-lxc direction when its acceleration is constant? Suppor m-)9k2xl8clawo m h-qt your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statemek ad)9fz7l5*v qvo:mc nt concerning its motion with resp9 l5vmqkz:c)a fv7o* dect to time.

  Can an object have incria1pu)giuh8vdm h1i) - d ige0;3ctq-easing speed while its acceleration is decreasing? Support your answgd )8q -viu3ha p1gdi;i mtu h)c0-ei1er with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Make0w hs,70gy wvj a sta 7yj,s h00wgvwtement concerning its acceleration.

  Under what condition is-b y 9r: unlx:d+o qir(aq(cj: average velocity equal to the average of the object's initial anax:jrrc: qy+bd -q( n(iou:l9d final velocity?

  Objects A and B both start at rest. They both accelerate at the same ratz*h7bfan 0l7e6e/dm 8jfav s)e. However, object A accelerates for twice the time as object B. What is the final spfe a/zl87njb7 fd)ev a6s hm0*eed of object A compared to that of object B?

  Objects A and B both start32/ / yq3 bk-yj qdbr7vd+biyo from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distancbqd2 -/q 3bv r+jyy7iok/3dyb e traveled by object A compared to that of object B?

  When an object is released ,(fffvqfq 6c2)nh6d67 0rm x tlc) lixfrom rest and falls in the absence of friction, which o (cn xif6xchqm ftvfld0),67q f6lr) 2f the following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction4ec ,ok .h5.kzy9wjo c, which of the following is h.ekyo5 c .c94j, ozwktrue concerning its motion?

  Suppose a ball is thrown straight up. Make a statemrkoadz9a5j 1 0ny /) rtr88ga4-jcwzdent about the velocity and the acceleration when the 94t85ajw0o ry8dc/a z rnr z dk-1g)ajball reaches the highest point.

  Suppose a ball is thrown lwf04h6 o +sq j(hw ;dvsw. kzv9q+9lvstraight up. What is its acceleration just before it reaches 4hqq+ lzvdk ;so9ww vhj 9v.lws0+f6(its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height1 1gdy.sn* qle, then falls to its initial height. Make a sl.*n11 ydqg estatement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxix.h h+;pi qh,c8g xt.umum height, then falls to its initial height. Make a statement about githx,x.;uq+h .h8 cpthe direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air ref ai7wpifhe ) /((htzn3+ j3zqjpa1c.sistance. Make a statement concern3q3 w1cp jtan7/+j(a (e)fh zz.ihfip ing its acceleration.

  Suppose a skydiver jumps from a high-flying :/qma kscdifr *o* 2h/b 5;nudu(.qxva ;lte2 plane. What is her acceleration when she she reaches terminal velocity?vaubk .2o (r/ e fsd;m tc;:*/5audhn*ql2xqi

  A ball is thrown vertically upwc6ni gcp(bp0oa6g9.p/n/2ozl c2 k w tard with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second 9(pc/co ac nwingl g.20b pk66ztpo2/ball to that of the 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. igv:y-kr b0.mgsn:t6 rpm0g) One second later, ball B is dropped from the same building. As time progresses, the bm0m-: r i gvgpstn)y6:kgr0. distance between them

  Ball A is dropped from the top of ru9kd/qr-q +ewuex )c/*j2 +szk7a tfa building. One second later, ball B is dropped from the same building. As time progrek9k e*qrt-fe d7/ 2/juac rz+qw+)suxsses, the difference in their speeds

  Two objects are thrown from the jrt7t 5uo,tc 1jz6dtdm )r-8h top of a tall building. One is thrown up, and the other is thrown down, bod-68)r7dcrh 5u1 otjzt tm,tjth with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A seg71tyzr: ge 3wcond brick is thrown straight down from the saygg:3z7e1 rwt me 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-zero velocitynuc n,+ki6bvk2 c knoom6.n*pw++3e k in the +x axis. The position versus time +3o26 n6mkukpvk+wecb ,*i .ck nn+ongraph of this object is

  An object is moving with constant non-zero an4*7yepd058przf u p ecceleration in the +x axis. The positio7preppy*u50 ne48z fdn versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. Tyl94ufn2 fjnc rdxty74e65 )phe velocity versus time graph of n ty 6) jx59rn4c72upf4dyelf this object is

  An object is moving with constant non-zero acceleration in the +x axis. The ve 9ey.(l;csb2.wtw tfclocity versus time graph owt;wf.te2 clyc .(b 9sf this object is

  The slope of a position versus til* nvm jx(bx5:0b jzz(zdq +5bme graph gives

  The slope of a velocity versus time p20ahpnbwlax4b,s8 6 graph gives

  The area under a curve in an accfukc8l9a ehn19 1a *vjeleration versus time graph gives

  The area under a curve in a velo4asnpts7s /bq91bg) c0ea /cecity versus time graph gives

  If the position versus time graph of an object is a horizontal line, pks6 s2y6.et4 klro4s the object is42srs4ke ost.6 l pk6y

  If the position versus time graph of an object is a vertical line, t i/1)q14b5hyrl q7kneusj7 ) rmoixw0he object isw1 kbj )qim0io1nsl)eqx477r u yh/5r

  If the velocity versus time graph of an object is a x5 we f.z)i4hyhorizontal line, the object isw)x .ihfe5z4y

  If the velocity versus time graph of an object is a straight line making cmh*/jr2 -srdrd)g9q6qo -16be4i pn zg6n ozan angle of 30 degrees with the time axis, the object r/2)*6njhzs r 46bdiggnq 6r -z1od-ep cm9 qois

  An object moves 15.0 m north and u wgvp6-r7 kyl9ox- 6othen 11.0 m south. Find both the distance traveled and the magnitude of the displacementy9 vupr7- -oklow6 xg6 vector.

  A boat can move at 30 km/h in /)etez ;z1stq still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/hse/) ztte1 ;zq?

  55 mi/h is how many m)d2e*- erzq1 va 8wj;i) fnk+rjduzy3/s? (1 mi = 1609 m)

  What must be your ave ja.zn ;pa;x(jrage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 k:xky:)d l .ym*-azcatiab 4;z ag)f0am) in 2 hours and 57 min. What is the average speed of the runner in m/sk my: 0* :ydzg )tfx.)ai4aa z-baal;c?

  A car travels 90 km/)z2fgg*swe wbopmu86 6*l j)d h. How long does it take for it to travel 400 km?

  A ly (light year) is th,9vg2ufzz ahw c73pn/e distance that light travels in one year. The speed of /cn,9v zu7g 23wh pazflight 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 alo -t h z2glp:.3v /wzxh4+hihywng a straight road and you look to the side for 4.0 s, how far do you travel durii4y: w/x+2.wltv 3hzhz pg -hhng this inattentive period?

  If you run a complete loop around an outdoor track (400 m). gyq/(n5e6wwgf mc2fe pl81w, in 100 s, your average velocity f8pw glcwy62ewmf 51geq/.(n is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km easpk/.r.. ,huh aia e2iht, thek.i/ e aaih rh2,.hpu.n 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 speed?

  A polar bear starts at the Nortw 0ehe zomh(33h Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.3( 0wm3ze hheo0 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 from school at 55 mi/h for 110 miles7flh3/b;d1 oul 7 mkjt. It then starts to snow and you slow to jf1l7/db7khult m; 3o 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. What ht 4*s8 jl cls:kx:,vuis the average 8s ujclh:t :4v k,l*xsspeed of the motorist for this trip?

  A motorist travels for 3.0 h at 80f9gx pb0 kngy5s:e w44ju (ri0 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?bn (5jw4 r9gfx:eyig 4supk00

  An airplane travels at 300 mi/h south for 2.00 h annmgqs58 b-+fs d then at 250 mi/h north for 750 miles. What is the average speed for +g8qm5 nsf-bs the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for +fe9vth+* + +4 u)jriy)fhbfo /w0 nsmee1k ndteam A can run 100 m in 9.8 s. His rival, the anchorman++ +bm)d)enj f4t/e kfu n9+hh*v wf0 rse1yio for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly anyz fk e.i(:j elv7tk*x5r l87qd comes to a stop after 10 s. The car's average velocity during deceleration was 44 km/h. What was the car's dv5jiez(q7 t*kk7 llfry:. xe8eceleration while slowing down?

  An airplane increases its speed from 100 mx o*xt.x0gj7z 9xtn,z/s to 160 m/s, at the average rate of x xgx,t.zo7 z90 *ntjx$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratep riqj4p/)r2q 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 and1wm n 8+w/*iibv f4ka;va vhmi)4-ryd accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then speeds up with a constan/dqm* o)f brf7h/ks 7k:hgui*+g b p0ut acceleration o/fkb7 hpu kgd q 0oum)7f/*hs+bi* r:gf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.9 m/s experiences a constant accelerationjkl0hov:1rwp 6 j;,q j of p0rv q1ohjjlw6;,jk : $4.5 \; m/s^2$. What is the cart's displacement during the first 6.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of g(y2eryv 1f3 8cjnwn .492 m/s strikes a sandbag and penetrates a distjg1.w(yr nc yv8e3f2 nance of 20.01 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launchedhj0cza()) dok from a catapult on an aircraft carrier. It reaches a speed)do) 0k(ach zj of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleracx7 yqc2; xje+fr2 x-1 k bif-m5g9jdgl;zw3mtion 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 of 200 m. What is its average a,boo ;wqk y-2zksy yq(we7aw; z x,h)2ccelkkqyoqbwwe() ;; a2ys 7xz-,2wzoyh,eration?

  An object starts from rest and underr p hxg27w4:p,bf y rf3*hkk5kgoes uniform acceleration. During the first second it travels 4.5 m. How far will it travel during the th:b xh7fp,wry 3g4kkf 5rkh2p*ird second?

  An object is moving in a straight +vkxbj :u9yh(line with constant acceleration. Initially it is traveling at 16 m/s. j9u hy: +xbv(k Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelqq,rfvik or 0j8,p47lr j9u,lerates 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 dry roadcq 17uw ch kdqz;3ng,4 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 grvn)s8 7j)s chq a0:iateen, a car that has been waiting at the intersection starts ahead with a constant acceleration o s:htvj)a7iqca 80ns)f $2.00 \; m/s^2$. 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 upwawjp 859bbidr f(1fuho t8: iv2 on.cr4rd with a speed of 12 m/s on the surface of planet X where tr1ot(cvd: bn .24r hiw9i858fpjfbo u he acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the w2bpr)/u8up 8d8 feswsurface of planet X where bu8e 88/2rf spwuwp d)the 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 speed old-;gqogok 40o-m7xc f 15 m/s on the surface of planet X where the acceleratml-goo g ;o4-ckq07dxion 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 on2qj3(h(iie) woehod 0 the surface of planet X where the acceleration dh(i e0do jw)oq2(i3he ue 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. ec-bdap4 ay9: ;4nhzw-rf4c x If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the rulerpc;9- a-ezxdn4a:hbyf4w4r c to fall before you catch it?

  A ball is thrown upward at a /s.zwlcv:yh c3;yi,kmgj(* uvelocity of 19.6 m/s. What is its velocity after 3.0y zi(gly3vs ;m/wjckh ,c.:u*0 s?

  A bullet shot straight up returns to its starting point in 6 s. q5* +pd/cva ao-d nsv.3zdg8b What is the initial speed of the bullet?gn zob+cs 8aa/.vdd5pv-*q3 d

  A ball is thrown straight up withj,6rjca yc0z8 a speed of 36.0 m/s. How long does it take to return a0 6j,zyj8 rccto its starting point?

  A ball is thrown downward from 2 ;;1yd9.mu cxlpfk8 yc ubq(zthe top of a building with an initial speed of 21 m/s. It strikes 8f; z(xd2 u;pq1cyyub9.klmc the ground after 2.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only f 1 g mwopp,zl9nu7n.q sk*19gnill in numerical value in the blal n.7,uznngm19p1kwpso9q *gnks)
(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 th+gc1p x-;ikmse air with a speed of 21.7 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1. fa1 q3fx4f(kg0 s?

  In Fig. below, what is the v05ht+w1es kz lq+y,;xgyll v9 elocity at t = 2.5 s?

  In Fig. below, what is the velocity at t =v aiv7 m6)j*hv 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s?h ,jkw- i h7vuzmi;a:9fr7 f8g

  In Fig. below, what ( qevt(;mv+ 0wnj9lkyis the average velocity from 0 to 4.0 s?

  In Fig. below, what is thvn t7e:86swy0l n9yz de average velocity from 0 to 6.0 s?

  In Fig. below, what isvzdr+n+ rj:zqkew2 /- the acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 s?cngaq (v0yg7(

  In Fig. below, what is the average acc7ybxadx1i uojcu9+(l 2urhwm:qo7 6 c8gal (7eleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 f5hu0r (kkkqk p6c.u)5pl le 0to 8.0 s?

  In Fig. below, what is the +b6g sk2ik nqkg*k; a)displacement from 0 to 8.0 s?

Does a car speedometer measu12 *84gmow1vu tdzvz0i(daiyre speed, velocity? {speed|velocity}

  An object can have a varying sp ptb/** lo9nlhz5zk.meed if its velocity is constant.

  The velocity of an obokf+k:vkli) 8ject can be negative when its acceleration is positive.

  If one object has a greater speed than a second objectvx85y 0hmdgy5s t-k -:vgdk i0, the first must have a greater acc0ykg-vdy55g:0ti dxk vhm8s- eleration.

  Two cars emerge side bu+dcs5y 0f d75 p/el 8ptwp9sby side from 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 accelerwsvpy zj.);dup+ifm1:vy .. uation decreases.

  A baseball player hits a foul ball straight up into the air. It leave h z05ymkv-9mbs the bat with ah v-mmz 0bk95y 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 acceleration, hjt o;2.1nkadt ow does it change if air friction is ignored1 tk a;.2otnjd?

  As a freely falling object speeds up, what is happ/z2(6s3yd c6jk udkxb 3xs.hbening to its acceleration, how does it change if air frictiox.(kzj/6u 6b ssd3 b32kdcxyhn CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original posv zyru/h*w2q.ivakwmp, 22b4 ition with the same speedm wuz / 2v.22k4,iawqpvhyrb* as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero veloy;g /i k4s jway:14srgcity and nonzero acceleration at the same time.

  An object can have nonzerqz-j,ggyh/ ) zo velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth f q m9d7e:lk a:i91dwrkloor making no stops along the way has ak9:emkd d wqi97l1 r:zero acceleration all the time.

  A rolling ball moves from6nvk kqi;i10 mbl.ux .vg3 .jm $x_1=2.8 \mathrm{~cm}$ to $x_2=-5.2 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.4 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lafw,;dhu9pa7 u fy7cqgu(m +1aps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from)5(bnuqcsd by9p) vb) its trainer in a straight line, moving 87 m away in 8.1 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its ave)qu95vnbb p(b c)yd)srage 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 fro0 bsn cu1ec.gtr 17q sr.)xdltwk/ /0vm $11 \; m/s$ to $24 \; m/s$ in 4.0 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 froppqq17uzrr ..v mt(40r xw)l bm $19 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachrb 8,at 0o).es5ng ct,heivr8 a speed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst (zsz v5gm( t/cout of the blocks to essentially top speed about /5 tz(cgvmz(s$11.3 \; m/s$ in the first 12.5 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 fr0 xkf )b6n*sel(v ebb)om a speed of $19 \; m/s$ to rest in 5.76 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a cawxn,r ptcpefkr) :s3/1fqk-)r leaves skid marks 92 m long on the highway. Assuming a ecx pr1f:,rt w/f spn)k3)-kqdeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go gqd7q*) rf.shing $25 \; m/s$ 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 n60whgg -q1fx than 30.0 min. After exactly 27.0 min, there arw0qh6ggx 1n-f e still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$