Suppose that an object tra90o ,5arrc9 acv pryj0vels from one point in space to another. Make a comparison betw5ropr av , r009jy9ccaeen the displacement and the distance traveled.

  When is the average velocity of an object equal to the instans)gazfqz6x)e- 1+kz utaneous velocity?

  A new car manufacturzr lze-mg wu;*di-6a-er advertises that their car can go "from zero to sixty in 8 s". This is a descriptionu zzgal -edmw6*--;ir of

  An object moving in the +x axis eqy:)m.o/)i yc0g o;sog-t3otdd 5 xw qnaqz0)xperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down as kqzw2l, 4;jnm it approaches a traffic light. Make a statement concernw;,mjq2 k ln4zing its acceleration.

  Suppose that a car traveling to the West (-x direction) benmn5hat 8 2bfs1r;)ghgins to slow down as it approachhnsfr 81b5t;m)2 ang hes a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant vc+gr)+/9inrmuwlz2g5r(+x p8 hpwd x elocity. Make a statement concerm8 5zi 9p)rug w2phxngl+d +/+rwrx(cning its acceleration.

  If the velocity of an object is zero, does it mean that the accelem; d31q/xu msdi/)jmhration is zero? Support your answer mux/m)s3 i;/dj 1dmqhwith an example.

  Can an object's velocity change direction when its acceleration is constant? st-xt kdr/sw) aa.63g Support your answer with axt s.katwdg/sr -a) 36n example.

  Suppose that an object i6 fl ;x1ez/bfbs moving with constant acceleration. Make a statement concerning its motion with respect to time.z;flf 61 /exbb

  Can an object have increasing speed while itswq d7sxnieb9c 73c(;k acceleration is decreasing? Support yoicxd(sb 3eqw97nk 7c ;ur answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.9(9,s vqtdu;hnofo*bn5vwf( Make a statement concern9o(wuv f b n;so5dq*( fhtnv,9ing its acceleration.

  Under what condition iszdf1)/4js 1lgv ptmj( average velocity equal to the average of the object's initial and fg)/j(11ptf ms4 d vzjlinal velocity?

  Objects A and B both start at rest. 0ccvy i.6i6nmThey both accelerate at the same rate. However, object A accelerates f6yvi06cci.n m or 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. They both accelerate at46x)d ,q nri)2)hujbdc vl p-g the same rate. However, object A accelupgl2 vidn,)xdrq46h)c -)b j erates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released fruyyr-;l(f ekxb4 4*xnom rest and falls in the absence of friction, which of the following is true concerning its motxb rxuf 4lkeny-y(4;* ion?

  When an object is released fr.n*,5lzaru3aeu+r/p amgeur5 ; lhg (om rest and falls in the absence of friction, which of the following is true concp,* .rzh5aag/e3u(a gue5l;mrur+n lerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity m4 k3ga;r( fn8n euz-.j+ejepand t3fg- (+ee j n.4zmjun 8apkre;he acceleration when the ball reaches the highest point.

  Suppose a ball is thrown sw mlsb 0f u;rbld9y)b rp455(vtraight up. What is its acceleration just before it reaches its highuw0m; pb45vr l sfdlyr5)(bb 9est point?

  Suppose a ball is thrown straight up, reaches a maximum height, then ycmz k 305hp g -9ose,g4dnr2had.y 0kfalls to its initial height. Make a statement ayz 4k9mn.go20a-ghe hkrp y 0c3dsd5,bout the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its inrw, -d3 w+ siieaire5i7oi.+ritial height. Make a statement about the directioww r d.ei,+7iir-3iie rso5+an of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a statbssa.mh4*o/(qnxt3d;y1yg iement concerning its acceler4.soxny*qa; sy1gbi/3t ( m dhation.

  Suppose a skydiver jumps from a high-flying e(yqnq,bc tbu,z /;8splane. What is her acceleration when she sbec/; ,uqtqnzsyb8 , (he reaches terminal velocity?

  A ball is thrown vertically upwa7yf,ssru w.d,6x:ly )+qcz+z gf j5hard 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 srlz6d ,+)g, s.ac +hyx:fqzfuy5wj7 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 bum ha3 d rdxt0,fz5f;:ailding. One second later, ball B is dropped from the same building. As tif x;ad:0d3mzh,a5tr fme progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, bazm vl7q *;kfjnmh/luypz5avd2/., .yll B is dropped from the same building. /.l j*,7y5fvlzahyvk/ n2udpm.; qmz As time progresses, the difference in their speeds

  Two objects are thrown from the :vv /o*f 0+ u)pktgknmtop of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are theirv0 kk gtu)/o:pnvmf+* speeds when they hit the street?

  A brick is dropped from the tohsgo0 4tbkr51 p of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resisk4 0h5 sgobtr1tance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Tn wki-7hn:g qwn0po.; he position versup0-gq:ni.okn nhw 7w;s time graph of this object is

  An object is moving with constant non-zero acceleration in the2ngb* hx(bg9y +x axis. The position versus time gxbngb h2(* yg9raph of this object is

  An object is moving wk*z u+;yifr+a:*ial(w8 wodhith constant non-zero velocity in the +x axis. The velocity versus time graph of this objeodh urkz wa*l8;iaf+ (y+iw*:ct is

  An object is moving with constant non-zero acce 0 j2 zonj6 ,bf20vogfucv1ji4leration in the +x axis. The velocit0022juzvcjigvo4 fb1fnjo 6 ,y versus time graph of this object is

  The slope of a position versu 4f6ay(tszomv(,6m)k 0we6 m joqm 9fos time graph gives

  The slope of a velocity versus time graph f6j jm:/*kvo ygives

  The area under a curvhy 9gxj1 8 2o3yn y2xrkpuug+)e in an acceleration versus time graph gives

  The area under a curve in a velocity versus time graphi w gp1n2x-3lzbw,)vm:6noh g gives

  If the position versus time graph of an objy4v/zc ztz,5lu0cy 5 ject is a horizontal line, the object isz5t/40clzv , czj 5uyy

  If the position versus time graph of an object is a vertical line, the obje1h3 j9a.vczle iuc8lbd/ q*f )ct is* i aljlh /)zc13.fq8cbvdue9

  If the velocity versus time graphzb+fq52uslnh/m vb 4c k5r4d 9 of an object is a horizontal line, the object is b +544sudv5 mkl/hq 29znfbcr

  If the velocity versus time gr axmtlp n2)t:*3qfgq 4,9s pyhaph of an object is a straight line making an angle of 30mgp ly aq32 n4,: x9htf)tqp*s degrees with the time axis, the object is

  An object moves 15.0 m nortt:p fuyh519vs cr8xs ;;roo/lh and then 11.0 m south. Find both the distance traveled and the magnitude of the displacement yls5spx;;:h to1c/r9 8f urvovector.

  A boat can move at 30 km/h in still water.z4ycf rb3;7u n How long will it take to move 12 km upscy nru7;bf4z3tream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =g1o dd1 8,l8mzuc xc ((qoywx- 1609 m)

  What must be your average speed r5)k ,f2qu+p6; 4iwi q flxj 3e/ 1cfbjjkxd3jin order to travel 350 km in 5.15 h?

  A runner ran the marathon (a)melrz mq pw2o-d9pe)z1. no; pproximately 42.0 km) in 2 hours and 57 min. What is the average speed of thz2oem-.d) qe1 w;pprm9o)nz le runner in m/s?

  A car travels 90 km/h. How long does it take fhr02dtgqwd /o3c x .-ta 3lh/lr)o4yeor it to travel 400 km?

  A ly (light year) is the dis7dpems(ei as h:j*r7 4tance that light travels in one year. The speed of 77p ei(sr d:mshae*4jlight 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 y1q:6z;/c sk uq*xlr osou look to the side for 4.0 s, how far do you travel during this inattentive perxsqo c k1/; q*us6:lrziod?

  If you run a complete loop around af;+kyfjd.r zfl;ww r y8y86e:f9t+ gsn outdoor track (400 m), in 100 s, your average velytw+k;frs:8ezw8yf.9rg f ;l6+ jdf yocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, h5gvw raige 00 ht7ot tf51z**z37lycthen 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This t*l5eahr o*t ti 07zggz0tw3c7v5yf1h rip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North q4. 7mdjj 6puvt 0vs8tPole. It travels 1.0 km south, then 1.0 km east, then 1.4 7dps v6 jv0mtjqt8u.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 on a weekend from school at 55 mi/h for 110 miles. Itag+-iud0k,qu )9s-xo7e zsmf then starts to snow and you slow to 35 mi/h. You arrive home after driving oums s u079-z)ix, f a-+kedgq4 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 imkb8 de9pm i(7s the average speed of the motorist for this teidpbmk97 m8 (rip?

  A motorist travels for 3.0 h at 80 kpcw()h x4foc.m/h and 2.0 h at 100 km/h. What is her average sp)chfp cx.( 4woeed for the trip?

  An airplane travels at 300 mi/h so a ce:/ngq,9yfs2qe2outh for 2.00 h and then at 250 mi/h north for 750 miles. What is f 2 nsee y9:gq,coa/q2the average speed for the trip?

  In a 400-m relay rac999ms cy5 iekbe the 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 tb9ckei9sm 9y5 eam 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 comes to a stop 6m0 2/vi -f5h*seu xxhy 2r f9ghu4vyzafter 11 s. The car's average velocity during deceleration was 78 km/h. What was the/*4 h y uz9f6vr2 u-xihvgh 0y5sxf2me car's deceleration while slowing down?

  An airplane increases itss 7sk yr92uk dw5xh(+i speed from 100 m/s to 160 m/s, at the average rate of 5w+ hi7ksd2(ys uxr9k$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h h)* ow: jk(wn b jh2adn+3j;gaaccelerates 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 accelerates av .4 (c+ xxxc6wetnh0ft $4.0 \; m/s^2$ 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 yingz) .x *ur*boa)*dwith a constant acceleratio*b* xi*nu)dygz a)o .rn 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 6.5 m/s experiences a cons,cnzge 7-qloo4go/ i( tant acceleration o e4lgg oo-nz,(/7oi cqf $1.7 \; m/s^2$. What is the cart's displacement during the first 7.1 s of its motion?

  A bullet moving horizontally to the right:nun, 2lxvexegn ++k3 (+x direction) with a speed of 233 m/s strikes a sandbag and penetrates a distance of 27.66 cm. What is thk,v +3+uxnneg :2lnxee average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a ca8x7,qp a i,bt0m rpz3ctapult 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 constant, what is the lenmxbai p7zt8 0rcp,q,3gth of the catapult?

  A car starting from rest moves with constant accel hoftx tnd.;*5eration 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 vs0m0kb;x ;) m:nduyl oq/z. cdistance of 200 m. What is its average accelera bnk/qdm; ;0 msv)lc.:uxy0oztion?

  An object starts from rest and abn6 x6 f:5pg9ku-y0)eop t.g by9acoundergoes uniform acceleration. During the first second it trxu6 ockp gya oy-b6)tfeg.n:a5 909 bpavels 4.0 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration.kf./ qw rof pnj;e-58s Initially it is traveling at 16 m/s. Three seconds later it is travelinesf fr j5w/k-8; .nqpog at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unqjv-5ue xq,fg65mw fn .kv8v5iformly 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 as -6 tq3 txdepa2b2cz5 dry 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 green, a car that harik8m 5kwe2e4adu6z tq3+nk+a( 3evl s been waiting at the intersection starts ahead with a constant acceleratio+4eveazd 3ktu85rwl32q+inke (am 6kn 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 pl: -s, k*fn4liq:qzk aianet X where the qsl -ki4k,qf ia*zn ::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 surface;ouj;n yg +yc5 b,8idy of planet X where the acceler85; y+u y jygoin;c,bdation 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 of 15 m/scbdi y,*; yckdfo77;d on the surface of planet X where the acccddyo,yi * 7f7bdk ;;celeration 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 surface of planet X whrsk ,+iva;z+.4pn0 9/k7c ima iode czere cozke 9r/iv.kcs a4i +p7zd , +anmi0;the 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 t az ggvp8e.r84 sa+0bahan 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 yo+e8g .a zga ap08srv4bu catch it?

  A ball is thrown upward at a vloao4fl 2:ya yw.r .n+elocity of 19.6 m/s. What is its velocity after 3.00oao.ryll4.: +w nyaf2 s?

  A bullet shot straight up returns t 3h1tty)ksx8 lo its starting point in 15 s. What is the initial speed o18)hlt3 xykts f the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take teh ,;f,xri us+( xn v)vmaf3od*.0wrxo return to its startind,)sm, v0f.3n;uxarx exhvwr(o+f i *g point?

  A ball is thrown downward from the top of a building with an initial s( f.c(oyle+ftl y .if6peed of 20 m/s. It strikes the ground after 2.7 s. How high is the buil(i ef.(lycfft. ly6o+ ding?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in n s o5lf;i(arx/umerical valro(x l;a/ f5isue in the blanks)
(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 straightrz)j7.lep/)ya b5 sy i up into the air with a speed of 46.4 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 l4agldbncz8pnh . ts8:j884l t = 1.0 s?

  In Fig. below, what is+ *dirqg d1j11i e-guf the velocity at t = 2.5 s?

  In Fig. below, what is the ve vb hbjvh:gf8/*+ghp9locity at t = 4.0 s?

  In Fig. below, what is the t2rlj, w e6 xjdz65 fv75bsvv,velocity at t = 5.5 s?

  In Fig. below, what is the avhj9vmy f ,;e-uerage velocity from 0 to 4.0 s?

  In Fig. below, what is the average vy7b4n2c(wibs8 8+n nwl u plj:elocity from 0 to 6.0 s?

  In Fig. below, what is thj2tdq8a bi9m/ g r.h fvb1k9*de acceleration at 1.0 s?

  In Fig. below, what is the acc9 gv4cmpb 9 qlf:/oa,tq1 9whvwi,wg: eleration at 3.0 s?

  In Fig. below, what is the )xt/ pdhbke*e+imq; q)2f(7 6cune yg average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from, ui z3w*5a vokb(+mdk 0 to 8.0 s?

  In Fig. below, what is 7ap a+ilp5b-m9f11wks/7nhlflwl rdy;q6;fthe displacement from 0 to 8.0 s?

Does a car speedometer measure speed, veloci;vw88w ezfe5hty? {speed|velocity}

  An object can have a varying speed z87jfpqixrk y4/75zp if its velocity is constant.

  The velocity of an objenl;2kdo y )r5nct can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the firstvyvhoc ) :m6ez-0hv )g must have a greater accelerati 0:) hgve)c yh6vvm-zoon.

  Two cars emerge side by side from a tunnel. Car A is traveling wir9k0z1/ vkfkroebe:z-b5 g (dth 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 accelerat ypxy0n8uy8b;*n b4xi ion decreases.

  A baseball player hit byd2xzk -k+6ryb+yfct() o 9rs a foul ball straight up into the air. It leaves the bat with a speedx fr6)++ oyz- ky(d yt9bbr2ck 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 o8 oo wq5pt ob9-,/rrvebject speeds up, what is happening to its acceleration, how does it change if air fo-e vw8/ bpo9 rorqt,5riction is ignored?

  As a freely falling object speeds up, what is happening to its acceleryhzk xi2aga2- j9 b3*wation, how does it change if air friction CAN NOT xja- g3*2wia2b9zh ky be ignored?

  An object that is thrown vertically upward will ret c/zdd-r jmhlun0f y832x..cl urn to its original position with the same speed as it had initially if cfh8 d l3ln.c/yr.d-0zj2xum air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonpkwn 075fr: fqlr) u(h bule-8zero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at tf ve7/xw).hdxhe same time.

  An elevator moving from the second floor to the fifth floor 9reyfx1s6 m 5-):)lns yr txtvmaking no stops along the way has zero acceleration 9frsr)enxx5 m t6-tl)v1:yy s all the time.

  A rolling ball moves fr0 ).kemb 4iwxoom $x_1=1.8 \mathrm{~cm}$ to $x_2=-6.0 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ 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 $t_1=-5.0 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps .pxisl) ow-4 maround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.6 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 abi 3vw+96uw nb straight line, moving 88 m away in 11.2 s. It then turns abruptly and gallbwu ib +6nw3v9ops halfway back in 4.5 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 frocd-tx8z +xp-zrflt:f-k;a d,m+o lcos4e 4m 6m $10 \; m/s$ to $24 \; m/s$ in 4.2 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*y 1e9dmmn1ya $17 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ofa l5s. 3jjs,w3khok*j $26 \; m/s$ 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 can burst out of the blocks to essentially 2z- 0ur3rhuwvtop speed about zr 32uvr0w-hu$10.7 \; m/s$ in the first 10.2 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 s8eqtsdfw3 v xs3/yga 6 78/tsbpeed of $20 \; m/s$ to rest in 4.54 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 the highway. Ass(4k 6ddh6)9z n.msry, wreorduming a deceleration dz)kerh, 6yrn 4w.mdr(69 sdoof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tra c5n2i cpl-ng3 *wrq((2zggtuck going $25 \; m/s$ 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).    $m$