Suppose that an object travels from one point in space to another. M)rcgx4/s39nu udbztkq+0 u o2ake a comparison between q)cg3suu0b2r 9o u4x n+t/d zkthe displacement and the distance traveled.

  When is the average velocity of an object equal to the (mz1f jw*jziy1n86l o instantaneous velocity?

  A new car manufacturer advertises that their car can3gsn,n mwl,:x gg6w o) go "from zero to sixty in 8 s". This is a gn 6,sxwl gg no,mw):3description of

  An object moving in the +x axis experiences an accelenaexo)h5jem9 y0h;e ;ration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling toe qmtr(ek1,t -q31rl .zag*xr the East (+x direction) begins to slow down as it approaches a traffic light. e(q r3xg lm1e-r,1* tr.qkzat Make a statement concerning its acceleration.

  Suppose that a car traveling to t njf41 akx4i 0vhxtjrkcr18-)he West (-x direction) begins to slow down as it approaches a traffic light. Make a statexrt)nv r0 a 48-jjikc1hfxk4 1ment concerning its acceleration.

  Suppose that an object is moving with a constant vexca37n,s n 1r*vx2ymllocity. Make a statement concerning its accelera 3r7sy1nlv,m *xx2na ction.

  If the velocity of an object is zero, does it mean that the ack(l, s.wpwf+ j)g0xsxceleration is zero? Support your answersxl0 f(,wkg+x. jpw)s with an example.

  Can an object's velocity change direction when its accelera) ,gtjcevo5 i6tion is constant? Support your answer),v ie o6t5jgc with an example.

  Suppose that an object is moving qt guwt5/9ib4 with constant acceleration. Make a statement concerning its motion with respect to ttwi4/ u9q g5btime.

  Can an object have increasing speed while its accele7o6mafz1, ra6k (zy owbaj .-iration is decreasing? Support your6jzwkafyroaz-b.moi16a ,7( answer with an example.

  Suppose a can, after an initial kick, move ++b5-yzuvuf: hyudjy 17 5wvcr;grs1s up along a smooth hill of ice. Make a statem7d-u1vwfzbgvyy +r; 55jc 1 hs:yuru+ ent concerning its acceleration.

  Under what condition is average vekh aw ktj :r328v74vaulocity equal to the average of the object's inira7 : w8auh vjtkv432ktial and final velocity?

  Objects A and B both start at rest. 0zpwu +f,le o; They both accelerate at the same rate. However, object A accelerates for twice the time as object+zo 0l,up fw;e B. What is the final speed of object A compared to that of object B?

  Objects A and B both start ym ,/ea sc50sofrom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of ob0y, scemao/s 5ject B?

  When an object is released from rest and falls*7k z+z,sft7 yd1jvyt in the absence of friction, which of the following is true concerning its motionzt7 k*1std7jf, +yvzy ?

  When an object is released from p6p,jp95e +;goqipz as5 ,s pnrest and falls in the absence of friction, which of the following is true concern9, ,osn;ps5i+a ppj pe65q pgzing its motion?

  Suppose a ball is thrown straight up. Makefv,7l.yqb v2uec. ko) a statement about the velocity and the acceleration when the ball reaches the y 7v)2f. qlub ,ko.cvehighest point.

  Suppose a ball is thrownam1 x52asrrd 4+dyv :ie7 m4xa straight up. What is its acceleration just before it reacaa 25xv :4y7m1didsrrx 4 m+eahes its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height g*;pddgv n(vj/wtu*w57 zpp kb3u/+-e w*gwu , then falls to its initial / /u+k7(*;*3 g-v g5wudt nwzvew ppwdjb*up gheight. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximu; auelbew/ u66m height, then falls to its initial height. Mak ;aue belwu66/e a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absz) l -4ub2w7 lj lfo.uas8nph+ence of air resistance. Make a statement concerning i)ul-l awsl84bjozh+u. 7f2 npts acceleration.

  Suppose a skydiver jumps from a high-flying plane. 467nwxw pcer64n(tqgWhat is her acceleration when shenw (wc64tx 4p76rengq she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An jwodjue.) a. ;identical second ball is throj a.de )j.u;wown 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 than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B is droaow*t6jjf,fnn.i * 7q pped from the same building. As timt no*nq,.fi *j76wj fae progresses, the distance between them

  Ball A is dropped from thseuk5.k/ik;1t,e4iahgx s b/e top of a building. One second later, ball B is dropped from the same building. As tsuk4,eii;t a1. k5/kbsg xe/ hime progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is jb+,ic/v o :vcz:bj *dthrown up, and t/bco,:z jb * dvi:jcv+he other is 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 building. A second brick is ,u+ej.kyy-fr h (2/raid2y2cqfn3 ukthrown straight down from the same buildi d r hu-y3(a.k+,ec2 fyn2fjikryu2q/ ng. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zeu) 9;peu,gwf1ib pra7 ro velocity in the +x axis. The positionpw ) ,rfebaug i97;1pu versus time graph of this object is

  An object is moving witu x*.gknj7- g-wm5sgq h constant non-zero acceleration in the +x axis. The position versus time graph of this s-.5 w-xu nm7ggk*qjg object is

  An object is moving with constant non-zero velocity ipw v6)vfif4;x cac 3is ;1dkw9n the +x axis. The velocity fca;icv 1dx fw); is kp4w6v93versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x ae8kx.f/ eh voug+*th)xis. The velocity versus time graph of this object is* eh8vg/ )e th+ukx.fo

  The slope of a position wbu:jp838fgv m 4lx n0versus time graph gives

  The slope of a velocity versus time graph gi1,motys( gus.d3t g :aazbj;-ves

  The area under a curve in an accewyzk0zz71 gp,+i/ akvl ;((ai2dnr heleration versus time graph gives

  The area under a curve in a p nw4y3d(.lkh velocity versus time graph gives

  If the position versus time graph a2xg:wg xv(9tg)e(o0u8 bour of an object is a horizontal line, the object isvbx9u8o ux)gor(e0a 2gt : g(w

  If the position versus time graph of an objecjm0;wb3 j-kt kp.5 lid*rfrmc3(zrm 8t is a vertical line, the object isb 8m;rp05*jfk3 rdjrwmi3tcz.m(-lk

  If the velocity versus time graph of an object is a hom0a n+ ml7 u.u,hb9tpgrizontal line, the object i9t, 0ulmgapb7h.um+ ns

  If the velocity versus time graph of an object is a straight lin oaub/f b/g.5lsk8:bz e making an angle of 30 degrees with lbaub sfzbk/ :o/g85.the time axis, the object is

  An object moves 15.0 ma1 e-o0 nwonwcq i6.s) north and then 11.0 m south. Find both the distance traveled and the magnitude of the displacemeni6ws) w .c1neo0anq- ot vector.

  A boat can move at 30 km/h in still water. How long willo3pp6mp t:f k y2c/iq-yi4tzhvzkx bi8*5* b: it take to move 12 km upsp 3 4vhz2bo 5ii-kb*8t:p x*:z6tcikp ymfqy/tream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = pm 37g)h.4 yx q+4 oynym3xjub1609 m)

  What must be your average speed in orderlxsie/ .l-:h* fggv4 gwdip69 to travel 350 km in 5.15 h?

  A runner ran the mare8axhx+ ut(o c1(9e wrathon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in+ (euxrhca(eo81 w9xt m/s?

  A car travels 90 km/h. How long does it take for i+j1dnbmf5 tzhw09 ) yct to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The spef4skml+2ca -t-y : vtwed of lia-c:flt +wvtm-y24 ksght 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 straighgkl(;lgva 9)8 rb a ic0w:icn1t road and you look to the side for 4.0 s, how far do you tra kr8 09cl gnclaabivwi(g;):1vel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, you szy7-mv1vm uarc,mqx lt+5 2.r average velocity ismqst,luca rz.+- mx1my7vv 52

  A polar bear starts at the North Pole. It travels 1.0 km south, 8)6iiul q;wkn 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 b lq6;u8i) nwikear's average speed?

  A polar bear starts at the North Pole. It j/3m-av n36l9 (eo(0x2njdxwbf lpe ftravels 1.0 km south, then 1.0 km east, then 1.0 km north, t 63x-e 23 lf9jow0n xbavfd/p mjne(l(hen 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 from school)s q/gvqb-a)0dg-q0ikw bsd 1 at 55 mi/h for 110 miles. It then starts to snow ans - dqaid 0q-sbq1g0)b)vg/kwd 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 av bwe(b ( q-8zo3mrcc)ferage sp-qm(b3cb ) (wfozc re8eed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100c +-to0hdyu.z km/h. What is her average speeyzd o-0t.u +hcd for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then n ;f ggzlwx4e6y q)3x(at 250 mi/h north for 750 miles. What is they)w;xqxl zg46 3fen(g average speed for the trip?

  In a 400-m relay race the anchorman (the perwb oqep r5(25dson 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 finalboe5 qrd(wp 25 leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes tosealf 3 c:6u/x a stop after 9 s. The car's average velocity duriscl / fe6au:x3ng deceleration was 35 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s toy,ktg -,j ys.kiod 5a* 160 m/s, at the average rate of ij kgdot, ,a*.sy5k -y$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kmvlj;4t) q*cz7wr8e ay /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 rest s3 tw7 0zp*,zjjg*cq3; pppjaand 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 dzktda.d f ;ce6 ;+a-t,4v uylthen speeds up with a constant acceleration ov k-, z4;f daltcd+ aety.du6;f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.5 m/s experiences a constan sy 5fn3lhk2ogv g3m;+t acceleration oysv5 hk 3 +lm;gonf2g3f $2.3 \; m/s^2$. What is the cart's displacement during the first 8.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 4f8iok78: yoxzfgt t0;72 m/s tfi:go0; fyoz8t x7k 8strikes a sandbag and penetrates a distance of 44.00 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fr(.bhk 9fpq +xbom 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 acceleration is constanbhkbx( f9q+.p t, what is the length of the catapult?

  A car starting from rest 4 q3hw9e/v.uijh quj1r mt4) rmoves with 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 of 200 m. What is ith57)l vnyqr/e 5 uxqik.9r*ues average acceleratixh n5l5)9vur7kuqe * /eryi.q on?

  An object starts from rest and undergoes uniform acceleration. During thekm 8w 3tr9ub at-+x-yi first second it travels 7.5 m. How far will it travel du3 9iumxa-+y8tk trbw-ring the third second?

  An object is moving in a straight l 6gsabsq:/tj.cmb z8o q9+ho 4ine with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during:ostg8js o.4+h z6/b ambc q9q this time?

  A car starts from rest and accelerates unilqxk,3pif7eq5 f -;or formly 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 roamao-mbj 58g -zgg80sld 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 green, a car that has been waitiur2m e ++xixvwfo+o7bma(-9 i ng at the intersection starts aheaxm2fvub+-o m7a i er9i+ +wxo(d 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 with a speed of 12 m/s on the surfalm -c- bna) p(w/vwztsarz l5.8t 05tyce of planet X where the acceleration due to gravityzattzsmp(w0l 55ab8lw- ctny /-rv ). 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 surface of planet Xd+gypa r0p+) w where thappyr+ g0d+ )we 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 spey.j sxy+ o ,n0scwito )(smy,7ed of 15 m/s on the surface of planet X whereoj wyc) +y,i7oy.nmt0,ss( x s the acceleration 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 the surfacezoyvs r r25*( g+g6efg of planet X where gegg6r(5y+2 r v*zsfothe acceleration due 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 your friend holds. ty ,(gxcnvxgcsssxt :2f )3+ a ruler between your fingers and releases i t2sfcn,().txxxsv3s c +gyg:t without warning, 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 after4ujlu4t ylv/bzl.qvwr6 *23 x 3.00 sl6 tjl3xv*w 4ru.y/z2v b l4uq?

  A bullet shot straight up returns to its startine/d g2e1a*g5fdp/qgc ep t(4pg point in 5 s. What is the initial speed of t5fp4/ce dqadgg pgp*2et /1e(he bullet?

  A ball is thrown straight up with a i 7jyb* nz*84azfndibpe4p2p2 gon5 2speed of 36.0 m/s. How long does it take to return to its startizeo2ngnp*d47 p *iz54 yf2ab npb2j8ing point?

  A ball is thrown downward fl24tya r:q.ycrom the top of a building with an initial speed of 17 m/s. It strikes the ground after 6.0 s. How high is the bal:ry c y2t4.quilding?

  A ball is thrown straight up with a 85r 3 3 wqmld+yqaau,mspeed of 30 m/s. (only fill in numerical value in the blqu8am w3 3m5qal+d,r yanks)
(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 wit;s vp /tn5(io: sot ln,uq(f1lh a speed of 38.0 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is:/zjszkqqyo/3 p,ohn cp09j 7 the velocity at t = 1.0 s?

  In Fig. below, what is 0 b)3o1pl ftvethe velocity at t = 2.5 s?

  In Fig. below, what is the velocity aop6e 9 k0iyya)t t = 4.0 s?

  In Fig. below, what is the velocity at 4v*k6ycbzrt / t = 5.5 s?

  In Fig. below, what isgceir dk yw062uvok,) p6/y, j the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity. yg i9lrgkn6e i0 o29;a lh 1gd+oahe14rcw5c from 0 to 6.0 s?

  In Fig. below, what is yj mtmc63*wu 5the acceleration at 1.0 s?

  In Fig. below, what is the acceleration ays2 c*q7/voua 3;tzdg t 3.0 s?

  In Fig. below, what is the average y99a8j;pwvnw acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelera6tx-z 0to qz42m ys;bation from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 885 vdq;vu dx- se: uh)9e4jrib.0 s?

Does a car speedometer measure speed, velocity? {speed|velocit(b:njkgoq)u66 zkd i:7 .ez pdy}

  An object can have a varyij8t1v 9*ayopwi5ev ;h 6b t fcq2(b*axng speed if its velocity is constant.

  The velocity of an object can be negative when its dc6k5l:x-kcbm1qo( j 1n kfrq95 rb ;pacceleration is positive.

  If one object has a greater speed than a second object, the first must 2c0vvst : o)7 *xczmhzhave a gret so2 cmxc7:zv)v0 zh*ater acceleration.

  Two cars emerge side by side 8 xhgz+ *3q1 hspr+eaifrom 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 ihbbob3a an a0*mru1 .(n speed as its acceleration decreases.

  A baseball player hits a foul ball strs4s,fb ai+-.rx t+ w) dre2gykaight up into the air. It leaves the bat wixw i+4)+rrkf,s- yd2ba seg.tth 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 happengiyhhe(7gjv;pg7phzqdw6aq62 ( -*f ing to its acceleration, how does it change if air friction qq y6vgj 2(*ehhfhzw;i6 a7 gpp(7dg-is ignored?

  As a freely falling object speeds up, what is happenir ; 6jw2 pccjs sem*cmn4zqw,+j;yb1.ng to its acceleration, how does it cm,b w*czj ;12w4yqs;rj pc6jnsm .e +change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will qj*w; s c vlek8bi9l,7return to its original position with the same speed as it had initially if air resistance is negligible. If air resv,*s7;9lkjci8q bw leistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelera i9zn7opv* (aa/sme lzl i8z/*tion at the same time.

  An object can have nonzero velocity and zero acceleration at tffz5o)3m e-6e,bmu 0d l8ayy ohe same time.

  An elevator moving from the second floor to theanp/ j3,dc)tmi1p vw+ fifth floor making no stops along 1 ,)i dj3p+apcm nwvt/the way has zero acceleration all the time.

  A rolling ball movesxcrdxcmzg 77tjhz pz(scc/l2.) ( 8i* from $x_1=2.7 \mathrm{~cm}$ to $x_2=-6.4 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ar 0tl7ul. lwbc;ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.0 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trailg q-m*ncba;fw; u(y(ner in a straight line, moving 92 m away in 8.3 s. It then turns abruptly and gallops halfway back in 4.7 s. uq;ba* - wm(f;l gy(ncCalculate (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 fromg:e6t)ohyj)u qeakb7.y /l6 o $13 \; m/s$ to $22 \; m/s$ in 4.1 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 from wlx qqld;c*,na, w0bdhg) 3yma49+ub $19 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reatj39b:,yzor cch a speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter c1gsyyb974e zib /: cmtan burst out of the blocks to essentially top speed about bsyyb/4ic1t79gzm:e $10.5 \; m/s$ in the first 10.7 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 oez)( sr,doi3rds6v-kf $15 \; m/s$ to rest in 4.22 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavds)+h: l pmg: qzqc4g;es skid marks 92 m long on the highway. Assuming d+g:4ghqmq ;:l )pzcs a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going5fvtf-pk nxglv j67(1 $25 \; m/s$ 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).    $m$