Suppose that an object travels from one point in space to another. 57eap:/xymol xj0v u/o 1e4ng Make a comparison between the em 07o e o:15p4v//xjnulygxa displacement and the distance traveled.

  When is the average velocity of an object equal to the instanta. 6x0/rs(nq mlu9 2 eumym/hf3mc; vlineous velocity?

  A new car manufacturer advertises that their car can go "from zero to /ka k8./u i; hjorp0nssixty in 8 s"./a hknosi.jku0/;8pr This is a description of

  An object moving in the +x axis experience :m n.u erssfc1h60e(js 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 /am3)v fx)sfg slow down as it approaches a traffic light. Make a sta)vm/a fgfs)x3 tement concerning its acceleration.

  Suppose that a car travelinbx 3c nb6 +d+rwbhwr1;le.6pf g to the West (-x direction) begins to slow down as it approaches a b.b;xbhfrr 6l p 6cn1w3e+d+w traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving wx-x c3b0vx(tt) 3dxdnith a constant velocity. Make a statement concerning its acdb 0xtdx) 3-(3 xxtvncceleration.

  If the velocity of an object is zero, do( 5 rysg;o6hfeli htn-)9zcc9es it mean that the acceleration is zero? Support your ansohcr(zsfneyh 9 )i65 lgt-9c;wer with an example.

  Can an object's velocity change direction wwd ab(3f8s(dp hen its acceleration is constant? Support your answer with an ed pbf(ad (3sw8xample.

  Suppose that an object is moving with 1wsc(le/x( ,na)arzpconstant acceleration. Make a statement concerning its motion with ress c(xra),/ pzlna( ew1pect to time.

  Can an object have increasing speed while its acceleration is decreasing? Suppoebf.jc7u./ qrrt your ans rquejc.fb .7/wer with an example.

  Suppose a can, after anbz+y2ae b l9c9r1),ih8yqylu-d5 w gw initial kick, moves up along a smooth hill of ice. Make a statement concerning ice2g5-9)yy 1 rl dq9a bhwb8+lwyu,zits acceleration.

  Under what condition is average velocity equal to the a nc9cw/b te5;uverage of the object's intn5e ;bw9/ucc itial and final velocity?

  Objects A and B both start at rest. They both accelerj:ve5 sea4i3 lz3qev9ate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to tsle4:i 9ee ja35 qvvz3hat of object B?

  Objects A and B both start from rest. rt. uf:ju.v 5z,sj8d kg4v7dk They both accelerate at the same rate. However, object fz 7.js5r t,.:d8uvkdv4jugkA accelerates 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 releasedl* uaa ;zo.x(krt+hu oioje/5 xb:g82 from rest and falls in the absence of friction, which of the following i/kj;a uoao2hiu8(oxg zl5t r :+ex .b*s true concerning its motion?

  When an object is released from rest and falls in the absence of frict2 kw bna1dvk3zg fb522)9h zihion, which of the following is true concernifwdzv 1nb iah gb2h2k)95 z2k3ng its motion?

  Suppose a ball is thrown straight up. Mak1(fxk 3,pucxxk i s;3je a statement about the velocity and the acceleration when the ball reache pkksc3;jf(i ,uxxx1 3s the highest point.

  Suppose a ball is thrown straight up. Wh t.biq:-ltvx8at is its acceleration just before it ritqxbvt- 8.l:eaches its highest point?

  Suppose a ball is thrown straibq1-vg+:*4dqgzijj gq0 q. ob ght up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the bal *og q+qqjd-vq41:. gbjiz0 gbl is going up.

  A ball is thrown straight up, reaches a maxi 9myg/u,(m( q aii,e;c3cxugqmum height, then falls to its initial height. Make a statement about agum3q imxc/y( ic; (qu,e, g9the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make yw3mu a gwbs7mt(8 wl.98kc.qa statement concerning its accelerationmb kuqt g.l.w8sy87wwca 3 m(9.

  Suppose a skydiver jumps from a high-flying plane. t g .r+wxxc)jdhd;ls/ 3d y8iqp 2lp7 u;u3j6bWhat is her acceleration when she .lxs cjqr x73itp 8d;;udwh j up62)y l/d+gb3she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball is;rb -scmh n5g(wor2 3s 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 higher does the second ball go than the first bwr;5sb2gm3r( n-oc shall?)

  Ball A is dropped from the top c.j)d9,qc axyof a building. One second later, ball B is dropped from the same building. As time progresses, the x )qcdc9.,ayj distance between them

  Ball A is dropped from the top of a building. One second la aes1bi0.ss2 j0h 3rpgter, ball B is dropped from the same building. As tims.bsg02a3pe1s hrij0 e progresses, the difference in their speeds

  Two objects are thrown from the top of a tall bug576 fvmrd y5vy5w3 iwilding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds wh 537vfiw6 5vyyg5dwmren they hit the street?

  A brick is dropped from the top of a bu1a w6bpc9nwb 2ilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acc9 1 6wpbn2bwcaelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x a,1d.hu brl5tjxis. The position vtr b.u5ldj1, hersus time graph of this object is

  An object is moving with constant non-zero accpo eo6g7,8o fseleration in the +x axis. The position versus time graph of th6,oo e g7pf8osis object is

  An object is moving with constant non-z 8t.2bbc: +p.gdrt8 *hlmhrca ero velocity in the +x axis. The velocity l2th :rc.cg dh8*p b.8ratb+m versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Tnn +k 3ou;ry7khe velocity versus time graph of thik;3nrn7+ okyus object is

  The slope of a position versus time graph give*70 i/itthfyca m),xus

  The slope of a velocity versus tijt31+ wjox0zj3ehj a 0me graph gives

  The area under a curvecew*; *q msadr1m q*r- in an acceleration versus time graph gives

  The area under a curve in a velocit))ot 4.pkfnlji)ud/ my versus time graph gives

  If the position versus time graph of an object is a horizontal line, the objev)f o6pi; ry)k;srt q,ct i)yrp;sovf rik;)6 ,tqs

  If the position versus time gnda8 g2cq0 bp*raph of an object is a vertical line, the object isc*028q ndpabg

  If the velocity versus time graph of an object is a horizontal line, the obj)wdzx h)hkaqa-5tx e zr2 249k1s gl)cect iswl5)c 2gxq zxz-at)r4ksd2k h9h a)e1

  If the velocity versus time graph of an object is a strair;vww;3x k 9hwght line making an angle of 30 degrehx9k v w;3w;wres with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Flr*;q ;.sl:6i4piuogw ab/y sind both the distance traveled and the magnitude of the dy/ .aqr ;giu6l:l s *ip4;wobsisplacement vector.

  A boat can move at 30 km/h in still water. How long will it ,su3fhz.uj:cah;2u btake to move 12 km upstream3;uju,s2 hzb:ufh. ca in a river flowing 6.0 km/h?

  55 mi/h is how many m/s?o8-bdi)rgn 1c (1 mi = 1609 m)

  What must be your average speed in o*q n (0lt-pzflrder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 mkxd p 2eh*8rcpss j6*4;6)ejkjwe3 g2 jz+gajin. What is the average speed aex *d6esjgj642r8g;2jhz)jw3*+p ks jk ecpof the runner in m/s?

  A car travels 90 km/h4-cfchmbh;y4c3g4gu . How long does it take for it to travel 400 km?

  A ly (light year) is 2 1afvjrt/*mu the distance that light travels in one year. The speed of light ivrt1a fu*2jm/s $3.00 \times 10^8 \; m/s$. 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 to the side fo7aa 9ycyb da (b+nu3f+r 4.0 s, how far do you tra+ a(y b3 aaf9bu+dn7cyvel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your av 4 u6uj6oe5lpgerage velocity ie o j56u4uglp6s

  A polar bear starts at the North Pole. It travels 1.0 km s kjc;zsi)71bq 2ux*3 lc i/obeouth, then 1.0 km east, then 1.0 km north, th beq li*; 7sko1xjub /c)3czi2en 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 North Pole 2kki*4r /tsekvt:n .q. 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 avkk iqv4t: nrkt/s*2.eerage velocity?

  You are driving home on a weekend from school at:rr- (brdc/otup7 f*kj0n( +: t sszfe 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 mintt+rrsrs07f ocd / k:bzfnjep:u-* (( utes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/ ob1oofz indh.hp+( )9h. What is the average speedhi d (fo.no )p1z+9ohb of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/vl 4+ z, h4a0*tnsfxbth. What is her average speed fh* bt,tsf0v4nz+a x4 lor the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/r 1n(zxoft.f(h north for 750 miles. What is f(r nxftzo.1( the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for7rcw zm0(au/o7 i+oh:d 3-vyhdp 9hzh 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 te :9h/yooiphm-rh0 (3zdu7vc+w h 7a zdam 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 stop3h nlnu1yuc(w5ft b,y 5z:r(z after 11 s. The car's average velocity durinz3wt5c5 bznlyy u(uhr :n(,1f g deceleration was 69 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 16fsr7 kz.qiljej. + ;tp:*)oga0 m/s, at the average rate of ;+e 7i.oajglkr*t :z )j.fqsp$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rateeue, s/8q5smn cem7b - 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 andovea (1tgc4f u0w6+y q 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 ks w:a ur;g/xbsb(b,.h3l 3meconstant acceleration of a xw(:mb/3ble u;b .sk,rg3hs $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity .l ( wbbr-z4x ykibbi* c)s5l+of 1.1 m/s experiences a constant acceleration olbcwx(rl+ikbbb)y- iz s *.5 4f $1.6 \; m/s^2$. What is the cart's displacement during the first 5.9 s of its motion?

  A bullet moving horizontally to the right (+x dir(qz4 2fnqq+wrbyh 6 i/ection) with a speed of 464 m/s strikes a sandbag and penetrates a distance of 93.65 cm. What is the aq+yz6q rf/i2wqbn (h 4verage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrvu 6irv,l1() -1)btcat bzl blier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming (,tcva-6il)lt1lbb 1v b zr u)the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant aslttcovoj 108 :3du6wcceleration 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 4b19qk*xqy* khy 3atmto 80 m/s in a distance of 200 m. What is its average acceleratiok3*y* x ah19q4mybtkqn?

  An object starts from r5nl*b:xmck,2xk3an hhc0pj ; est and undergoes uniform acceleration. During the first second it travelsbka3:c;mxp xj,hn*hk 0cl 2 n5 4.2 m. How far will it travel during the third second?

  An object is moving in a strairep qj,u5a/hmz5 zm vbzjm259q. ii.,ght line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10. . mb2a ium,z z55/5m,pjqhjq9rez iv m/s. How far does it move during this time?

  A car starts from restzuj z9i;o2:gr and 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 decellfo (hvvi3 fcs31z 4l-erate 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 gtxwlb dpc3vdw l;+3 ;:reen, a car that has been waiting at the intersection starts ahead with a c;tpw:wd cvdl3x+3lb ;onstant 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 surface of planet 0 , /itrvgbt:afwl;)( du olv/X where the accrt(lw)i;ut/fdlab :vvg/0 o , eleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward. equ0z .mpz4w with a speed of 12 m/s on the surface of planet X where the accelerat. z0uwpz4q. meion 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 wi9gic1g6xp* 5x 0( i( dbkuaxrbth a speed of 15 m/s on the surface of planet X where the acceleration due to gravity i*gxx19 ai06rudcp x bg5(kb( 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 surface0z/ 8mzu:iy9 dh yfeb,hn a:v; of planet X where8yh fym :vz,0zba:e hun;9id/ 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 gb- *9 hxtd70gri nnw+yreater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you ndi0 g+b9 yt7xnwr* h-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 ve3 fo7b bqt-mm:n:zfcmy c;g5:locity after 3.0-mbmoyz m5;b:: qcg tf 7c3fn:0 s?

  A bullet shot straight up returns to its 8ztas.s vq y+ej-) cddp3m/*wstarting point in 15 s. What is the initial speed ofza dt3wj.-vpm y es* qd8)+/cs the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it ppmb;h2.9v/ plt dks+ take to return sb pp9t2 +dvpkm /;.hlto its starting point?

  A ball is thrown downward from the top of a building witdng,wlf :wo*2 h an initial speed of 24 do,wg*: f2w lnm/s. It strikes the ground after 4.1 s. How high is the building?

  A ball is thrown straight up hb +i9 qj;f*dzwith a speed of 30 m/s. (only fill in numerical value in the b * zi;fjbdh+9qlanks)
(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 with a sp :d(*m lhu2t lvw:)ji+a ojdea0 1jz+ceed of 35.6 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 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 veloukr 7xx l-uw. ru-0tm*city at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 s?r 7oup7f.k4 hr(lx4-5vedw c l

  In Fig. below, what is wylu+wwf z +tk1oq/p+ dbg9 ,2the velocity at t = 4.0 s?

  In Fig. below, what is thegxte5yk ;;*bldm:( 8y( pgsca velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 ssm435 bd.ghvkyz* nk8 ?

  In Fig. below, what is the average velocity from 0 to 6vkt( j/)0ckt9h2 60ds fda pfq.0 s?

  In Fig. below, what is the accgw/hb-p3;q yqeleration at 1.0 s?

  In Fig. below, what yzwd4x gg ic9n qi+0- +mhxigq 1s3)e2is the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5s)a(f25q : lo0gfwfgj.0 s?

  In Fig. below, what is thll.wl 7yyqn b ;5t7ud+e average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displa vlx./le ld0u2cement from 0 to 8.0 s?

Does a car speedometer measure speed,ufv oe-v5x me2+(;quv velocity? {speed|velocity}

  An object can have a v bhelf(,l oec7k9z5)a otwce3 ;ek17p f-rfb. arying speed if its velocity is constant.

  The velocity of an object cas/-j )a vhgy2jn be negative when its acceleration is positive.

  If one object has a gre)5v:mzz: 3i qq6qhqypater speed than a second object, the first must have a greater accelerat:q63qp:q5hz)m zvi qyion.

  Two cars emerge side by side from a tunnel. Car 0y;u m.pzo5zen;+ dzx 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 acceleration decre: .t;fwvxa 0mbcnqz(,f,b+2g0 g n aetases.

  A baseball player hits a foul ball straight up into 9zj8gl84;sdoq7k ky xthe air. It leaves the bat with a spezd9s7jk;8 8qgkl4 o xyed 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 acceleratiw v*:p00 5xjfxna6 sym ug0f8uon, how does it change if air frin6x:jxypfa uu wg5*0 msv08f0 ction is ignored?

  As a freely falling object speeds up, what is happening to its acc:z)y5p1sxf)ug uta n8e( c:ag+uc4mceleration, how does it c 5tn )): ug8f:cx1 z+u(mcaeyapgs4uchange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original posit uew;mgp*l- bo9 (vhg01*e jbcion with the same speed as it had initially if air resistance is negligible1pe bg bwgjhvlm*; oce(*-9u0 . If air resistance is appreciable, how will this result be altered?

  An object can have zero velocl54*jo usrp 5fgsy)d d,hk. 2fity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at8 4m 8nm8ycvkc+tjwh +nv(;z j the same time.

  An elevator moving from the second floor to the fifth floor )j/yelqrbn5o vcx7 *u54r e w(making no stops along the way has zero wu7c5 j l(e5 )xrvy*/erbon q4acceleration all the time.

  A rolling ball moves fro g-df23f) hrqh. s0a uutgn/9um $x_1=2.2 \mathrm{~cm}$ to $x_2=-7.1 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completes9 cl*+gx1wob bhp ;*u laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.7 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 a s; rf77 -hmv: wz8u8uoa-/rro erdij a5traight line, moving 88 m away in 8.7 s. It then turnhworfz7;: 8u- u58 ji7-aoreda/ rmvrs abruptly and gallops halfway back in 4.7 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 frg2kq 1 :4 gslvm++npxbom $12 \; m/s$ to $24 \; m/s$ in 4.8 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 fro pj3oo5k)zr,vjl o: a hch;b,7m $20 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re+09 8jrt 8pffbonj;jbvw,;p b fku07uach a speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to eszf qb)3l2 b mkt/el3k2sentially top speed about323ekzb)m2fb/kl tlq $10.1 \; m/s$ in the first 11.2 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 fromoer+ r::shk6 hyqw 31t7:v4cyhpmq:c a speed of $21 \; m/s$ to rest in 4.37 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mar dm,nb-r5t p5jj;bxq)ks 92 m long on the highway. Assuming a deceld jmb5tqp)x5,-jn b; reration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gc6j k w;1tb)uuoing $25 \; m/s$ 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).    $m$