Suppose that an object travels from one point in space to anoteag)o v4 bz7ni8jo8 (r9m: azbher. Make a comparison between tbb84n(aom7 98re vzj agio)z :he displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocityubc1 :wzwtmw-* 99ul y?

  A new car manufacturer adve4nddl o/ ;u4icrtises that their car can go "from zero to sixty in 8 s". This is a description cin /;4uod4 dlof

  An object moving in the +x axis exper .uamy1jyueqw .1q5*f iences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to *oy8xnz )jt7xk1r 4o 7xt oe6athe East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concernxxnyxoz17e*tor) j 64 7a8 otking its acceleration.

  Suppose that a car traveling to the l (+oh2lxo u+dWest (-x direction) begins to slow down as it approaches a2 o(u xhodl+l+ traffic light. Make a statement concerning its acceleration.

  Suppose that an object is;dwa68ki( qtrqaaa 12 moving with a constant velocity. Make a statement concerning6k;ta w id18a(2arqa q its acceleration.

  If the velocity of an object is zero, doeuu9djqo zdom(re4:7rx e:;3zpp : j t,s it mean that the acceleration is zero? Support your answer with an examplejo ez r::rd;ote39um4up 7dqz,pj:(x .

  Can an object's velocity change direction when its accelerati jneo2kpaz de9 +-y 5uw.p( :susy.q(aon is constant? Support your answer pysp2ou s:aj -9y kuzw.qeda((5e+. n with an example.

  Suppose that an object ie* 2hlr;)z j tma4fs(ts moving with constant acceleration. Make a statement (f hrt2 zms4lte;a*j) concerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is dei s)yyei*wuv:p2:4 av creasing? Support your answer w2: *:4)ewayvv uiis pyith an example.

  Suppose a can, after an initial kick, moves up along a smooth hill (wd k/th7ck0p :zxsfc v39-ybof ice. Make af p70y3bdvh: -/9ckcwk(tsxz statement concerning its acceleration.

  Under what condition is average velocity equal t : c p+r71li tqt.a0zbx+e; jkjo3-adwo the average of the object's initial and final velocitq xtr biw1j-j+0k.td ;7zel: 3caoap+ y?

  Objects A and B both start at rest. They both accf0gq chb11,s helerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A gshbhc1,f 01q compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same ratep1g;.z gkjve+eb d9*hg d13ur. However, object A accelerates for twice the time as object B. Whevjd1ehd1uk.*g +rpg 9;gb3zat is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls inp1-hj6zl m):. fx shdb the absence of friction, which of the following is true concerninsf dp h:bmzj 61)lxh.-g its motion?

  When an object is released9u l/)0ks( rkttm2h,ra1nlne from rest and falls in the absence of friction, which of the n1m,t)09 unlrthla ( 2 rske/kfollowing is true concerning its motion?

  Suppose a ball is thrown straight up. ycb*n b-)r-zjkohf* :Make a statement about the velocity and the achk)r: b*fyn *bc--jozceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just beforeicp;t w4 -*cst it reaches its hig*t-w cpcs4t ;ihest point?

  Suppose a ball is thrown straight up, reaches a maximum833vj*mqkqo :r ,ze lw height, then falls to its initial height. Make a sta qjkomwe8*3 qlv:z 3r,tement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, thtkaqnp./ zx z3.) c6khen falls to its initial height. Make a statement about the direction o.chazpt x )/z6.nq3kkf the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downwar7+a-v,s6o4fqnbjizz d in the absence of air resistance. Make a statement concsqan7, 4-j6o i+zfbzverning its acceleration.

  Suppose a skydiver jumpc0atkrf z:6 h/snsr)a0h1phpy2fm8 9 s from a high-flying plane. What is her acceleration when s0 hn9ack608p1srapft rzfhy sh :/2)mhe she reaches terminal velocity?

  A ball is thrown vertically upward w;lhw.4z8bvtf 9 vi- dwith a speed v. An identical second ball is thrown upward with a speed 2v (twice aw-z4wh9tb;viv fl d 8.s 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 than the first ball?)

  Ball A is dropped from the top of a building. One seh/ 4adeiam0w,os *r6 econd later, ball B is dropped from the same building.4dmsrw*,/ ieo 6ea 0ah As time progresses, the distance between them

  Ball A is dropped from the top of a building. One secaj).ut 2v y ng:lf*x3/gad6aiond later, ball B is dropped from the same building. As time progresses, the difference i6jafg) 2ny:dit uxl/a .gv3a *n their speeds

  Two objects are thrown from the top of a tall building. One is thrown upll fo-*amr)bb8c nzw 65 wbp(7, and the other i7 noa5b68rw-*(wzc bb l)fplms thrown 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 builf8h1dq k4t hs;ding. A second brick is thrown straight down from the same buildingd 1kt hhsq;84f. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with cop;w pii7(u 5wfdy)9 hsg 5fcj:nstant non-zero velocity in the +x axis. The position versus timepp5j f:f;dy ) whuwc5 (si9g7i graph of this object is

  An object is moving with constant non-zero acce+ (/l:sxcrpo nj7u5srhh*a h1leration in the +x axis. The position versus time graph of this obje+u*r: xhp5arcsh (hn sjl/17 oct is

  An object is moving with constant non-zero velocity ikkowtz iie++1kj4 zaof9( q2 9n the +x axis. The velocity versus time graph of this o+kwjk9z oz2qf(4 t9 iae+ko1i bject is

  An object is moving with constan/-yp- k burvy3t non-zero acceleration in the +x axis. The velocity versus time graph of this object is-k y/yu3r-p bv

  The slope of a position versus time graph g2p cxf,gt ;q*1/qme7odill: qives

  The slope of a velocity versus time graph giveslh3cx u7)ith.w,gag+

  The area under a curve in an acceleration versus sa o)h1;3(9ugq uas;)nrmj nstime graph gives

  The area under a curve in / b9p1p-a6:q. n qo6gfldcfbn a velocity versus time graph gives

  If the position versm)lpy5 t u *r 64moy)9ti lcgf.88xrrfus time graph of an object is a horizontal line, the object is f tp88r*r9r.4lx yoy 5 g)tumiml)cf6

  If the position versus time graph of an obj tvnf+5t 7 aa4y6qlsl0.kha5lect is a vertical line, the object isaa 64f5+kls 0l l7tv. nhatqy5

  If the velocity versus +0 o1svs h sli(pinu05time graph of an object is a horizontal line, the object ii l(+vi h1 p0oss5su0ns

  If the velocity versus time graph of an object is a straight line making af7 jy3 5yefn-4qml/ uyn angle of 30 degrees with the5jy/3yun q fym-f4 l7e time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both tl cd,ev-cv+rfx/( s27hb o fw*ba 6dc9he distance traveled and thc 6, +bfw-bd2xv*l/c dvr9oeas ch(7fe magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How li )l(9tk/ (qgyknwwb0ong will it take to move 12 km upstream in a river flowing 6.0 kb(t/9 (wk0ykng)lwqim/h?

  55 mi/h is how many m/s? (1 mi = 1609 gxfn4) (13xlg4izmvk2 dzk1a kx d3 j6m)

  What must be your average speed in order to travel 350 km ,b14vish :kebp9/sry in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours ank9o4i* xpxjo2 d 57 min. What is the *jxpko2 iox94 average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 407d 81rx *lee 6fnhvhi/ f:k4dk0 km?

  A ly (light year) is the distance that light travedz2foy p56l:o ls in one year. The speed of loyo ld2 p6:zf5ight 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 tj94 l6.2pq1tl tdomgko the side for 4.0 s, how j629.plkmttgq ld1o4 far do you travel during this inattentive period?

  If you run a complete loop around an outdoor o*ajfw-*s:p:cn xi )gwot56q track (400 m), in 100 s, your average velocity i)6qs jacwop::xwtg*n 5*if -o s

  A polar bear starts at the North Pole. It travels 1.0 km c6;5pw y y3srysouth, 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. Whasycwpy r65; y3t was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 1; dk0aktyddc 8rpt; 0km south, then 1.0 km east, then 1 0 t8;rcddk1p;y0katd.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 velocity?

  You are driving home on7 cp;v6k )wksc (+dsyd a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minkdsy+c p cks(v7d)w;6utes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km, rvy3( )ufndr/h. What is the average speed ofd) ur yfv3rn,( the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her t*hz0 ww9ou-osb( 4 pfa;snh 6average speed forfwhnoh s6wbt (-a0z49;o*pus the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fn:qkpu st y 6.*8phzy3gjchvgt7rp1h g+ g(53or 750 miles. What is the average spek nuvyt g6+3p g:rc zj(gs*7pt1 qhh5h.g y83ped for the trip?

  In a 400-m relay race the1+,qre t/k pod di;,yg anchorman (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, 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 thatdpit ,/k1, +yqrod;e g the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 1 yz etqpj0 u9w430yn-j0 s. The car's average velocity during deceleration was 41 km/h. What was the car's dejwy-nzp jyu300 e9q4tceleration while slowing down?

  An airplane increases its speed from iu3 ;8pf4hdvhi kv4 w0100 m/s to 160 m/s, at the average rate of 843p;hufivwhdv 4 0k i$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 k,r2cqeud m9 za76nsw6 m/h accelerates 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 rest9feak0ky(. hl )bfq1t and 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/* kh0rel8;vc3s p+bqes for 10 s. It then speeds up with a constant acceleration v*+h b80psecle3r;kq 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 6.8 m/s experiences a constant accelerati4wl ok4 wl-p2mon ofwopwm- k2 l44l $2.8 \; m/s^2$. What is the cart's displacement during the first 4.0 s of its motion?

  A bullet moving horizont*0no- z)443ksmjg knar/ pff wally to the right (+x direction) with a speed of 367 m/s strikes a sandbag and penetrates a distance0nfof4rk -/wm4aksjg)n z3 p* of 70.72 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched +b-q(b. npnsds a)w3w6ghbd.p:fv ,xfrom a catapult on an aircraft carrier. It reaches ap3 :b+)bavn xwpg b6(s. -ds.wqhdn,f speed 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 accelero6tj +b -r (pgcy z(airn63cx6 tkg1do -a-7mvation 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 bzym)4 ddv5 +my-svd380 m/s in a distance of 200 m. What is its average acceleratios3bv ) + 4zyydmmd5d-vn?

  An object starts from rest and undergoes uniform acceleration. Dirm ;b4rh)fd, uring the first second it travels 4.6 m. How far will it trar ,m)d;i r4fhbvel during the third second?

  An object is moving in a straight line with constant acceleration. Initiall-f i x h40k+4pnirmmc*y it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it mon*-0f x4 mi rkmph4ic+ve during this time?

  A car starts from rest and accelerates um2v.)1w . mzoywrm+kawedg0 4niformly 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 decelqqqanw:/y35zo+ 0rw: jn)fzrerate 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, 18bqj0qyw4s9z,bs wk5 bl n j9a car that has been waiting at the intersection starts ahead with a constant acceleration oj ,1ys nk w5qb899sbwb0q4jlz 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 upward with a speed of 12 m/ :zs8)b-/z+u 4k/ff ckye uuu)qqlsj -s on the surface of planet X where the acceleration due tz :y+zu -cs)b-)jku4 8 slkeuuqqf//fo 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 hjfmpvnhzgb*:2( l(. v jl3u4m/s on the surface of planet X where the acceleration due to grav mljh l2np v* z(g.3(hbf4v:juity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown up (myb2cy x3dmw6/ty 1yward with a speed of 15 m/s on the surface of planet X where the acceleration due m m6c1yxdy y3/b t2wy(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 the sur6j 3 xkfqx-t;f qetw80face of planet X where the acceleration 0tj 3xk8xfqw qt-6;fedue 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 dz rgfcg9t07 5than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you cat t5zd0ggc7f 9rch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after l5lqc to **0zx3.00 s?tcl* 5 z*lx0oq

  A bullet shot straight up returns qly0: dk.z2hqtq 9sxw86q +d cto its starting point in 15 s. What is the initial st ql 08kcwd9 .qd :2xqyh6qzs+peed of the bullet?

  A ball is thrown straig fa8uk0xd bz lxl/s056zjg)- iht up with a speed of 36.0 m/s. How long does it take to return to its starting pointajx0g5z )d6l 0zslfx8-b iu/k ?

  A ball is thrown downward from the top of a building with.1nqcvx +4mhn an initial speed of 20 m/s. It strikes the ground.vmx1nq4+c nh after 3.7 s. How high is the building?

  A ball is thrown straight up with a speed 4; yt8ce ,c1h9otw3u ztd,ygv of 30 m/s. (only fill in numerical value in the b yy94g3;tcevwh8d,cz,tt1 oulanks)
(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 2helo vx; z:w0 ( sty(4zqvqn.v ,gfo,ih7 mc4with a speed of 27.5 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity (ci ln70cs h+kat t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 sx 01 zg42xtihxr)vvbv8oud4:?

  In Fig. below, what iw mj+dw-xf// hs the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = kf61/t n5dav z3sjmr s /,mi)d5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 j: gjm9hol/e4 s?

  In Fig. below, what is the ahb ca:5) )1tdgbg u0xaverage velocity from 0 to 6.0 s?

  In Fig. below, what iszecn m60z2g0xr.:k-qc ;of bg the acceleration at 1.0 s?

  In Fig. below, what is the accelerationjcns vx ;k ;g34a)e;)owh) dkg at 3.0 s?

  In Fig. below, what is the average acceleration from s/( sf/hpwpc8r q9/ck0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s?*) :4v7.mrcpbsswr hpau+)n.tzcnm.( 6qy p u

  In Fig. below, what is the displacement fni3+xq(woc2xk7c;4 asv w g d;rom 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|vm6qqc t5ft;ngq0*mz8l1 y8oj-8rrn 9+ctd ft elocity}

  An object can have a varying speed if its vel m8sp))(fe vf3do02m6 vbb e, ijzrl9rocity is constant.

  The velocity of an object can bekyhcgrhf /* qmwa;6 bn/. :ut/;jwu* c negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first mus,o:094d. qp3t.lmucvoa k evroa7 a5 gt have a greater accelerr. lg ,4o vk:50d.a p eau3ovtm7ca9oqation.

  Two cars emerge side by side from a tunnel. Car A is x c0 2o*kcvo3p8zco:tz5uj t9 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 ac8pm., p6 bhlts its acceleration decreases.

  A baseball player hits a foul ball straight up (dr:nl;n* z- dm)cuv mnw(jv7into the air. It leaves the bat with a speuv*() 7nm:(vdm;nlr -dw zj cned 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,n5 7e:k*zpf 5q*)of oi 5/xesgtz+ wkj what is happening to its acceleration, how does it change if)p +/tg jof55zes7fk x qiw **e5znok: air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, hcn*ygk- jt5fnty7ex x; 1,7b tow does it change if air friction CAN NOT be ignot1nx 5b,c tenjt xy7;k*f-gy7red?

  An object that is thrown vertically upward will return *rwepld7h*h7bjd 7/ y to its original position with the same speed as it had initially if air resistance is negligible. If air r7dwh prjh**de /l7y 7besistance is appreciable, how will this result be altered?

  An object can have zero3oaw tm)narc , i3m(l06blyc: velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the )s b cq66k-cpzsame time.

  An elevator moving from the second floor to tnm:c.hdsr l- 1he fifth floor making no stops along the waym-s .hl d1nc:r has zero acceleration all the time.

  A rolling ball moves from n:s zo8o8l m,g$x_1=3.2 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.1 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundb8(u*ehssew b+a9ad0 a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its train)b(4aer0hb xjam (b+27sxpl rn4s. p3ciz p*ger in a straight line, moving 100 m away in 10.7 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average lb(asjp70m. bnrx3xpp i egrb2s z4)h a+(c4*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 fromlk*fw v/m.:y 8.voulf $12 \; m/s$ to $25 \; m/s$ in 4.3 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 from j/ 74f0up4kg 0jgy fvah-s3ao $22 \; m/s$ 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 speed of 8pmimh)c2(b9 l znv8:h,zl b vv0 nu*x-dat6a$28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can mjk 9s4+nrtdv kb1ehu.;s 61mburst out of the blocks to essentially top speed abouttv s4 1rm um1bj9;+dnh.6kske $10.1 \; m/s$ 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 f7ek p/oa)i ;dcrom a speed of $19 \; m/s$ to rest in 5.11 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 on .r9gu. wspyge* z d(c-the highway. Assuming a deceleration ofsg*-.dpy9z .u( gcewr $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goio3 n)how2fca)ng $25 \; m/s$ 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).    $m$