Suppose that an object travels from one point in space to another. Mw ajy53aa1 ,/a)ktzxkake a comparison between k5z1,w /a3aayk )xtjathe displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity? e9n 7n:v4wnf4s; iq:xtn*ptx

  A new car manufacturer advertises that their car can go "from zero to x9iu(ka 6m(yp2f)j a rsixty in 8 s". This is a dx(ua9a)2 j (6fpkmr yiescription of

  An object moving in the +x axis experiences an accelekzx-z:c1l 2anration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins7mn3jc nwv g6p*yikg:6)mzc y; ce*5s to slow down as itn;mi)56ep gk6*cmnz*g wcv 3 :7 csjyy approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x do2k,t1 ;ouxa.hknl +kpm3jngs 6mzbz7*q;h 5irection) begins to slow down as it appro3 hkn bmq;6gok .j p*hlzstkm+ 27z;un5, 1xaoaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a s 5qf8s 2x0 gpw/equw.xtatement conce qe gf/p2805xx.qwwusrning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is7o 1 bevo)od64ua pql9( rtqie *1xgu. zero? Support your answer with an exampqd1)7ot. 9ol o eu ub1*6ix4 egvrqap(le.

  Can an object's velocity change direction when its acceleration is constant?fee+n5j0qj0 q Support your answer with an exa0q+e j0fqjen5mple.

  Suppose that an object is moving with constant acceleration..3xjbfi5 kzgb*4ki9x Make a statement concekk g4f5bz.9bxj iix3*rning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasin g(p9i)p m * v(p 2di0qgli5tcae7(pcdg? Support your ansv0ipigcd* (g mapei2l d5q(c9p( p7t )wer with an example.

  Suppose a can, after an ivz3ryoxae/kbv -) i(y 0 q+,jinitial kick, moves up along a smooth hill of ice. Make a statement/j bvqz o-, 3yx+ae ii0vykr() concerning its acceleration.

  Under what condition is average velocity equal to the average of thwuea,f a rrx+grw(,b70 z eh97e object's initialr uz9g, a(rwre7f,ewxhab7+0 and final velocity?

  Objects A and B both start at resvy wf6yhh7,8g/2s5hio,o;o 5wutrf ft. They both accelerate at the same rate. However, object A accelerates for /h8y;yf,7f ih26otowofhv g5sw ,u5r 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 start from rest.;q9 hc4gc2(-j l8 j a8yekvazh They both accelerate at the same rate. However, object A accelerates for twice the time as object Bjlhac; zcg8 y(jv42q9ek - a8h. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of fr;v.f3y o4 heypiction, which of the following is true concerni yfo .;yh43vepng its motion?

  When an object is released from rest and falls in the absence of frictionte2+e. 2kgag69 khr u*wvd4fj , which of the following is true concerninrg92 eduv 6.jt*+kea4k2 gf whg its motion?

  Suppose a ball is thrown straight up. Make a r w( eb9c bao(tp(()listatement about the velocity and the accelol(pwi((b ec 9r() abteration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its 4u qf s3ev6pw*8xh mb+acceleration just before it rea+p su3e6q4wx*b 8hf mvches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum hzd7qtq)7r y8 yeight, then falls to its initial height. Make a statement about the q7qryyd7)8zt direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a 2( lkexosu05 gmaximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerati5 (ls2g0k exouon as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air zwyxzeowu/l;0xm+1 / resistance. Make a statement con;/0muozl1+ew/xzxyw cerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. W /zlf 3lw tl5*rm y6e/;j9rxlbhat is her acceleration when sh/j 9ly w*lex;b6r mf/rt3z5ll e she reaches terminal velocity?

  A ball is thrown vertically upward with a spe0e 4hx q0etu2l3mo;.emyjtt 1ed 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 ball to that of the first ball? (How many times hig xte41 tohlt.;u0m3e2 mqjye0her does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. On hk5rit i:ooc(0xn23 j1zw af6e second later, ball B is dropped from the same builo3jrz5cof2:kxni0h 1 ia6(w t ding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One sg+p86lxi(c ggecond later, ball B is dropped from the same building. As time progresses, the difference in l 6g8(gxic gp+their speeds

  Two objects are thrown from the top of a tall building. One is thrownn5wcv( 2kuw1wgj v 0(q up, and the other is w2vqju1wvw( kn0 5(cgthrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building.( ;mje x0ij4luym-e a4 A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two b-jajlm4;0e i uyme x4(ricks.

  An object is moving with constant non-zero velocity in the +x axis. The positizx . 38e xct6pyv9qb pp) 70c9ntma)xion versus timqzv6 )t xpxcbx7.eip)9n9 3tpym0c8 ae graph of this object is

  An object is moving with constant non-zero acceleration in the +x axi,0hy;m raq1+bypan-y s. The positionpymq -an01a , yhr+b;y versus time graph of this object is

  An object is moving with constant non-zeryf h2xd.lg4- mp6trc /o velocity in the +x axis. The velocity versus time graph of this object is h6rfx y.gdcm2t/-4lp

  An object is moving with constant non-zero acceleration in the +x axis. The ve p9r2igcoaiyh.i-m1; locity versui21pycohriam9 g . i-;s time graph of this object is

  The slope of a position versus time graxss3ggp2 +o*:a fh fo5dm1 ba;ph gives

  The slope of a velocity versus timuhn ) 9dur65lpe graph gives

  The area under a curve in an acceleration versus time graphbq 4g.5 xjx:gh gives

  The area under a curve in arljrw1tzya, )/(z b( efy)kf 2 velocity versus time graph gives

  If the position versus time 4x;e8 qr;jadhsep b5pmrk +j,)p/d t)graph of an object is a horizontal line, the object is5q4+ ;; dthsj )),preer8p/j mpbxka d

  If the position versus time graph of an object is a vertica3 dtu/5ny w1 1,hlriv-a4drj pl line, the object iswt5 ju3,dliy a41r1vr hnd-/p

  If the velocity versus time graph of an object is a horizontaevn:/ n9g.c jcl line, the object nc/jv.ne9c :gis

  If the velocity versus time graph of an object is a straight line making, teswkwz,4fz; q31 wgr, q:h3y,duk q an angle of 30 degrees with the time axis, te d 4k:gzfw3q,3,ytzwh rwq; quk ,,s1he object is

  An object moves 15.0 m north and then 11.0 m south. Find both the ozrqjgu396x ; 9d8dov distance traveled and the magnitude of th9ogqxudo8jv 3 96zdr;e displacement vector.

  A boat can move at 30 km/h in still water. How long will ( r0fgi6 bi;klit take to move 12 km upstream in a river flowgkfr i(;i0b6 ling 6.0 km/h?

  55 mi/h is how many m/ovzm2f se qsi0 23dt);nlx6l2s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 kmqr+ay87pv sw6x i, x0j in 5.15 h?

  A runner ran the marathon (approximately 42.0 wnw8cr8 fb9ew h; o+e:km) in 2 hours and 57 min. What is the average speed of w w 9b8 8ho:;ecfrnew+the runner in m/s?

  A car travels 90 km/h. H4r7z;t.a4-qh6dd8lmt rx5ewt +oa u fow long does it take for it to travel 400 km?

  A ly (light year) is the distance that light p19 kves,zqfsogu8fa; f2f8 +travels in one year. The speed of kgu2ovq 18zps,a ff+;esf 98f light 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 road and you look tol)a,vhyf0jrsf qrl -f q-ru9wcd3 p-2s7 g(6m the side for 4.0 s, how far do yo-y p js6 sgfdfwa2,qrll 0urc7hv r9m3-(f- )qu travel during this inattentive period?

  If you run a complete loop around an oum)0fyzek t .22f s7lu1rgki/ ctdoor track (400 m), in 100 s, your average velocit2ki/27 fms0l)gt 1ufzkrey . cy is

  A polar bear starts at the 9 *yeljpka;c9North Pole. It travels 1.0 km south, then 1.0 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 bear's average speeja kpy9 9;lc*ed?

  A polar bear starts at a(k/hmp+basr c-f4o ,q n me+1the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wr-qm+p b4fk( h,aom +1sa/cenest 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 fs*(rlh ):tt: +tmcfrkor 110 miles. It then sta:tkt:f+r(c)m t rsl*h rts to snow and you 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. What is the a3)xuy zp17ip,z 5gq17glu.hjm u0zyz veragqp7yzm1ugj0 zzgl5 7) x3 y1.ipuh,uze speed of the motorist for this trip?

  A motorist travels for vqb zt+cpgzkq9558s ( (av5ou3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for tq59zg (+zpv5scto85 ( auvbqk he trip?

  An airplane travels at 300 mi/h south ftnf2gzy;j f-;or 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed forgt-; f2yn;zjf the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for t mefku iv5d t1611oz,deam A can run 100 m in 9.8 s. His rival, the anchorman for teazfud11k o6dm1 eti v5,m 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 and comestwx fpwux0szia0i 8yo (lmt.g4x.7-; to a stop after 9 s. The car's average velocity during deceleration was 34 km/h. What was t-u ;y gwitfloixx(zsatm.p4 00 x8 .w7he car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average3v1fbp4abwp ezv9hr m-9hwf1,j 18zd rate of zp, 1-w bvdafe4rbhj1w 1hmz8fp9v 93 $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h 7r56uc w1q) e1w eqcqcaccelerates 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 ah;k9d ( ftq(qvccelerates 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/s8gtl s*e /5uzd for 10 s. It then speeds up with a constant acceleration /ls * gtd5uze8of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.0 4691ac nw diham/s experiences a constant acceleration ow ach16d94 naif $4.6 \; m/s^2$. What is the cart's displacement during the first 6.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) wi ka2/pz buzq87k9t- hqth a speed of 476 m/s strikes a sandbag and penetrates a distance of 55.40 cm. Wha27ztzkkp9aqh-8/ ubq t is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is laupy8nq z x;r;:qk2f 7ivnched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the af :y27q kv8qxz;; pnricceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration ofqwjd 3ioco,klw3vuy5u* s2(;u :c v n/ $2.0 \; m/s^2$ 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 .8/bkba u2m;yhiz: vqiv8z8 s m. What is its average acceleratizms2 b8u :;a.8/qhzvv8ikiby on?

  An object starts from r+2wqn8 1xjsud bs9kdh l j/;r4z7s .z x)d:eohest and undergoes uniform acceleration. During the first second it travels 3.6 m. How far will it travel during the k1bsx/xddzj)4 d.q7 9 wn szs+8e2h : jluo;hrthird second?

  An object is moving in a straig2gxhv hqs rqctk77;,0ht line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is travelinghh7c, 7v0x t kqsgq;r2 at 10 m/s. How far does it move during this time?

  A car starts from rest anx/(l , smk ;fbqn;m.b(lsm)x td accelerates 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 road can decelerate at abo( awjk2( 3jb6dr1ggr.dst9uv ut $5.0 \; m/s^2$ 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 9 xr21p88 mhak/ .4u wfflktbyeooc- 3turns green, a car that has been waiting at the intersection starts ahead with a constant accele t mef /2p4cof.a 1kh9w3rokx-8y8lburation 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 with a speed of 12 m/s on the surface of planet X whd/czzh ve25 c.5 f8qkf9;hfaxere 2d98;h.5z f/avc5k cefzxh fqthe 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 spe ffzv 6 z7d;q3ho*qhcf)+8i kied of 12 m/s on the surface of planet X where the acceleration due to gravity isoffdf7vqhq ik38h;i+ ) z6*c z $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown up8e xgthlm*/-f bnu),owfi+iz);, lv fward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity tg +ovl*;l , ,f- xfuehz)fnw/i)i m8bis $2.5 \; m/s^2$. 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 the surfai /a9gpgt 0s/ 1utl9iace of planet X where the acceleration due to1utia 9 g/lgt0a/si9p gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually + dart,:z ;laugreater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expe ,:dau zart;l+ct the ruler to fall before you catch it?

  A ball is thrown upwardz/ l::rvr5x f2i1) hl h4jkbge at a velocity of 19.6 m/s. What is its velocity after 3.0frbl5v4h):hglk:e z j 2/rix1 0 s?

  A bullet shot straight up returns to its starting point in 12 s. What is j2 xpm/ w(;-bnzknf mk/e- kk:the initial speed of the b/enk;w:k(pxk - mm/- 2kfnzjbullet?

  A ball is thrown str.: f r sz50jfl4zgcxw5aight up with a speed of 36.0 m/s. How long does it take to return to its st.z5rfjs4z5gf lwx 0c: arting point?

  A ball is thrown downward from the top of a building with an initial speed of 6 qiozqr-fu .k1 ccv45x;t, x5o m/s. It strikes the ground after 7.6 s. How high is therq-4,5ok u f5;xx1c.t iqzovc building?

  A ball is thrown straight up with a speedp dk*w:5o2b5xv3t jq4gkv p0g of 30 m/s. (only fill in numerical value in the blanks 3kvg*dp:45t v o wb20kqpg5xj)
(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 uctcok-),fnfrd+ +z6q p into the air with a speed of 37.8 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vel 9pcd 60z/yzkj(65se0rl zf swocity at t = 1.0 s?

  In Fig. below, what is the velocity (7b9-f wty, ofayrb-m wqp5z :at t = 2.5 s?

  In Fig. below, what is the velocix elrumvn7z;k)z0jow :h(/,d ty at t = 4.0 s?

  In Fig. below, what is the s32djlzo5 ew* velocity at t = 5.5 s?

  In Fig. below, what is the averauu9 5pxf1f yu/ge velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocii9z/up7 d3s/2a 8wok ad6fsuwty from 0 to 6.0 s?

  In Fig. below, what is the accelerationk8xdw( gvj;yo )obuwsm-tgc8 88 xp0/ at 1.0 s?

  In Fig. below, what etzn.z9 c9+q pis the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration j;urb3aw;5cbvuq8 z19 6 qsp gfrom 0 to 5.0 s?

  In Fig. below, what is the l5v1vdn3 m4k 3zs 9zxnxg0iz 3a h;9cyaverage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemen kc4(ewz18exzj 1nr )et from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|vxc1yi5b k.:0 zsnfee* elocity}

  An object can have a varying speed if its velocity be iy.8pq ,( no,,gj bs-vj1hv8dps3lis constant.

  The velocity of an object can be negative when its acceleration is p8h;;v3w 8 b1xg83li j 8.en ubwqgsbmpositive.

  If one object has a greater speed than a secobmj39xxc. c)uv2l.ixtn 06l ond object, the first must have a greau6mc)xxi9lonc3 jl02 .btv .x ter acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling withy,qd.f(u6so tui.m4ppuo ,c ; 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 jr(z6tuxa1/ m acceleration decreases.

  A baseball player hits a foul jm)sj)dwwa ,( ball straight up into the air. It leaves the bat with a speedwm, jjdw)a)s ( 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, e0ctx;-9n c;vtm(wciwhat is happening to its acceleration, how does it change if air friction is ignore; wmti;n-x90 evcct c(d?

  As a freely falling object ym8c90v,hge g speeds up, what is happening to its acceleration, how does it change if air friction CAgv 80eg9m ych,N NOT be ignored?

  An object that is thrown verticallyzo2*t0h 4/.v 7lqa ob ;ulyyxk upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air ret lqk;u x.vb *7ol/4ha0y2zy osistance is appreciable, how will this result be altered?

  An object can have z:9o)a kg*cxie ero velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and py0+ qf3a2hw:8q itvpje 4b (gzero acceleration at the same time.

  An elevator moving from the second floor to the fifth floo: *7ee/g h dwg;s3(nbr s)gpmcr making no stops along the way has zger m)7ggs; c sb/ h:pe(ndw3*ero acceleration all the time.

  A rolling ball moves fro)otg4jpnxrdx62 7u-a - a z0gqm $x_1=3.1 \mathrm{~cm}$ to $x_2=-8.5 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lafmjn(a gux(t1j mtx6s r/m l8w735/qhps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trai4-3sqmvr j /wnner in a straight line, moving 89 m away in 12.8 s. It then turns abruptly and gallops halfway back 4s/- wq3jmn vrin 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 fro3s pqbm;vk ;jdr-rb,5m $10 \; m/s$ to $24 \; m/s$ in 5.1 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 fropv+gkel(k9e. k ai93hwic4n+m $16 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed 46h)qv4 ay jogof $33 \; m/s$ 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 tgjd ct / kou53;p))tdn98uzlzop speed abounut/3 uj;t 58zpdl)o)k9 g dczt $11.4 \; m/s$ in the first 12.0 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 gf hj6 havdb*o2966pg7+ih cqu; jf2kof $18 \; m/s$ to rest in 5.32 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leanu02i98 v3i0hx+3pqjmx a p nxves skid marks 92 m long on the highway. Assuming a de2vx ui8a m0hxnx pin3 09q+3pjceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going so9 gdz8g0+ t jafvg62$25 \; m/s$ 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).    $m$