Suppose that an object travels from one point in space to another. Maksl*aa6lawv6sq) m/ h,b+u ,n ee a comparilsqsh+e,uwl *av6a6a ,mb)/n son between the displacement and the distance traveled.

  When is the average velocity of an obje 0a x lzk8cn.,8dssz:l :zug0jct equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "l6npg+ugz2: qn 56pa zwc zmb23 6-jzlfrom zero to sixty in 8 s". This is a desngz5w:b6+z6 ln-2pqmzj 2l z 6 ugcpa3cription of

  An object moving in the +x axis experiences an ag8u0ceji01kzl1 ,em bx 1lh-wcceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begifvt buh,hh* ls) 0p0a13; rkgins to slow down as it approaches a traffic light. Make a sta kga3f);h pt*0, vu hhi0lsr1btement concerning its acceleration.

  Suppose that a car traveling to ezpef8, vv2eqwc s1.+ the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acce +2zeqc1,fpv 8 ese.wvleration.

  Suppose that an object is moving with a const w5,b 3:kuxbn42ohb zc2a.hp jant velocity. Make a statement concerning its accezw.hk4cuhba2j,n3 5bbpxo 2 : leration.

  If the velocity of an object is zero, does it mean that the acceleration is zerow8( (sm zyi9vb? Support your answer with an exampms v z8y((w9bile.

  Can an object's velocity change direction when its accele1fs.:t cssk/t :j6 kceration is constant? Suppor e1ss ck:.s :ktjctf6/t your answer with an example.

  Suppose that an object is moving with constant acceleration.dga)w p(, v(wn Make a statement concerning its motion with respecav(pwgnd) (w,t to time.

  Can an object have increasing speed while its acceleration +ixo9m:)- o w3tfkqelt3;k; yj dt4biis decreasing? Support your answe+ -lxdm:3ifo9)o twtqk ;;j4 i3 ybektr with an example.

  Suppose a can, after an initial kick, moves up a)esyjwl,o;qcb:0*ak io )- vr long a smooth hill of ice. Make a statement concerning its acceleration.be;sj c rk )yo-oi:aq*)v,l0w

  Under what condition is average velocity equal to themltjoz on ul09n u7/(7vp gn 4n8y-cz.z.v:zj average of the object's initial and final vpn7(7 :8-gl c0uv.9 m.uy/vj jntl zozn4zznoelocity?

  Objects A and B both start at rest. They both9:mw lw uwg8;u)z j3ni accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the finalnz w )u8; :gj9wwl3miu speed of object A compared to that of object B?

  Objects A and B both start from rest. They bqmf. ,btl9 mq-oth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distlb 9 q.m-tqm,fance traveled by object A compared to that of object B?

  When an object is released from rest and falls in thh wzgk9o b 6a ji6nh9+q+8r;qj 3+pfque absence of friction, which of the following is true concern+i6b9q+ j;3 q uwajzkn9or6+q8hgf hping its motion?

  When an object is releasedaye820tftpt a f:it5bz*w:k 2 from rest and falls in the absence of friction, which of the following is true concerning its motiob ate:z5aki:02 2ttywtff 8*pn?

  Suppose a ball is thrown straight up. Make*ubqgq:9,ea 2pb jb5b a statement about the velocity and the acceleration when the p:j 25,uqbge bb*bqa9ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelerac/a )ffouc 48vtion just before it reaches its hovf4f)ac/u c8ighest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to iys )cgq ue ( y ,ph4o2qt2y.0ay9evx4ats initial height. Make a statement about the directvqyo4y9.),2ugae 0 (2c ysqyeh xt4paion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum gde vs. 5fgz301pn)bw height, then falls to its initial height. Mak1z.pg3gs5)bvw ef d0n 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 absence o uem g.*a9j1pof air resistance. Make a statement concerning its acmgj1.9pa*uo e celeration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratio7tz qbanth0( u1 x*o3vn when she she reachz7(3 t1haoqtv ub0n*xes terminal velocity?

  A ball is thrown vertica+ctllet1- zb.jsg4/ flly upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice ae+ .4 f/-stjg1ctblz ls 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 dropp1*kfr,ab . l*c)uo dyved from the same building. As tima. rvcu,)1fby*okl d*e progresses, the distance between them

  Ball A is dropped from the top of a ,xp8 tc;b l)u0 wupj/zf6s8fdbuilding. One second later, ball B is dropped from the same building. As time progresses, the difference in th;xdz6p t8c s0fbf, plwu8/u )jeir speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and empo u tf6 ;gu+:gjbww/7p:::dm30igp g)j xethe other is throwpe; pg wb o::p0+fw6)/jugm xmuegd7jgti3: :n 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.ywzpg zz,5;,4txufy thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerayfxgt pw.5z yu ;,zz,4tions of the two bricks.

  An object is moving with constant non-zero vl u2d;s-: hdz0aydk-(d-adljxb3pw 06z: kjfelocity in the +x axis. The position versus time graph of this aupdbs:-lk( - d ax:60 k;zj- zhfjd2wdly0d3object is

  An object is moving with constant non-3nfj;,z/kf t w6j+vcf0kxib :zero acceleration in the +x axis. The position versus time grapxbj k;f36,/fn+vzkwct: fi j0h of this object is

  An object is moving with nwv 9y* vw7eq/constant non-zero velocity in the +x axis. The velocity versus timev/v q9*y en7ww graph of this object is

  An object is moving with constant non-zero acceleration in the +x axidx)la(n n68,rxc 3j des. The velocity versus time graph of tj)l(c3xn8d6d ae n,xrhis object is

  The slope of a position versus timer0;0d8y k *ru 1mmrmtg graph gives

  The slope of a velocityps vugcl6fcwwo.+-tt 4 tg9o6c) mz(2 versus time graph gives

  The area under a curve in an acceleration ve4eu6owtn1 sf ;k5g .jersus time graph gives

  The area under a curve in a velocity versp j0xswh3w2,c2l fs5 rus time graph gives

  If the position versus time 1xtlqze1v, xc s6xlx:mr p 22(qv2(lagraph of an object is a horizontal line, the object isczl:(avemrxq1xv2t lqx ls ,6( p212x

  If the position versus time graph of an object is a kwvos-2dam96y:j ij 8 vertical line, the object iskj siy9jdov6 2-a8mw:

  If the velocity versus timeg wvv.aa (y/3c graph of an object is a horizontal line, the object isg/(v wy3av .ac

  If the velocity versus time grapbrn *j 97k v5c+p)c.kxfmc4hq h of an object is a straight line making an angle of c)nbk 4 r7cx.k*5+9 vpqf mhcj30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sout9gop( 7p; u2sjtpk*r-l * wmk9tvbi 9th. Find both the distance traveptkmp(* ; r2gki7w *9j 9tp9tovsblu- led and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wilsj1 +wqcriqlif78(9 m l it take to move 12 km upstir qwqs7im +9fj1c8 (lream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1*b9qe lk tj):i7)lrwznzl07r mi = 1609 m)

  What must be your average speed in order/*9u/vkvqlql6rz t(m to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whsw**pa, fk4 wcat is the average sp,wps*c4 k *wfaeed of the runner in m/s?

  A car travels 90 km/h. How long does it take 5giec(2s(x ah for it to travel 400 km?

  A ly (light year) is the distanctrtz0 u 1)k+rne that light travels in one year. The speed of light it+1t knrru 0)zs $3.00 \times 10^8 \; m/s$. 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 stpgz+*-)htse kxpc)gq 5.pha;raight road and you look to the side for 4.0 s, how far do you ; z p g.+5 qtpphakg*x)-hs)cetravel during this inattentive period?

  If you run a completblpbh9 a4))vm*pz84 ma6 p hlwe loop around an outdoor track (400 m), in 100 s, your average veloch4pmwab8mzv))b 9pl ah*l4p6ity is

  A polar bear starts at the Not2 .xn./syosrrth 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 minr yx.. sot/s2n. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, th9xc w-6 soloy pj4ui.f3tkj33en 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 be4-wpuo ic yj6tf 933skj. x3olar's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110z ji1)p+apyau5h1s +a6n b dt* miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. Ha1+upzy spi ha6n 1+jb5at )*dow far is your hometown from school?

  A motorist travels 160 km at 80,mms:jt:qo za-(35qac ds s5 h km/h and 160 km at 100 km/h. What is the average speed of the moto:c5-msjas,qham3 ds(zo5 qt: rist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is h rr;vbqqb1.6omq9-f j er average speed for thv.;-rrq 6j1b9b mqqfoe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north r.nsq)4yv )d)2io 4isxb ur ;wfor 750 miles. What is the average spe)o ysr4)qw4v n )r;xu.iidsb2ed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 iro s.-3tlir( 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 that the team A runner s3-loi i t.(rrnot lose the race?

  A car decelerates uniformly and comes to a sto;y)pvvenh7e/purf -eib:a8,- l o7 yup after 12 s. The car's average velocity during deceleration was 55 km/h. What was the car's deceleration while slowing down, ho f-)-e ;vi/:yepblypu8e7 nv7 aru?

  An airplane increases its speed qawi j1t8 j1z*from 100 m/s to 160 m/s, at the average rate of t 1j w*81qjzia$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of9y;qjf/ q xcx2 $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelpb- sf;hm sg0f*,mbb8erates 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 1y h0e4wcb-*odow,ths. It then speeds up with a constant acceleration of yco0,whwo4 -d*h eb1t$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of5z gvvbrvz3p l.d; ;4d 7.2 m/s experiences a constant acceleration of zg vdz5pv4;b. ;vlrd 3$3.0 \; m/s^2$. What is the cart's displacement during the first 6.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) q;c9w /mio;qsru8 5lewith a speed of 342 m/s strikes a ;/crq5l9qe8m i us;wo sandbag and penetrates a distance of 76.71 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapu,o( lzcp111xhsfs57q zuqogcj7)n u4lt 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(1, z5ql1no7x7f sou1pu)c4j hzsqg c the length of the catapult?

  A car starting from rest moves 9ub1;;e)yp t v6f01ln/vyed5-nu iever2ruawith 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. +ogam+;9( j oa77esm 7btjvhe What is its average acceleration a7(g 7oh7jts ;++bavmjmoee 9?

  An object starts from rest annx85cvv (n*gq d undergoes uniform acceleration. During the first second it travels 2.2 m. How far x*vcng5qv8 n(will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Ini-qe: p +1rh( dsgce mtkr7et(6tially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/ceq :r(gt1eprhm k 7t(+e-d6ss. How far does it move during this time?

  A car starts from rest anh4t3*o ;2r.ywntm w wod 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 tire .qeyzfefm3wji1)82 cs on a 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 has been waiting at ,-qfi.myil. 3siqlshsh).k - the intersection starts ah.h.qmhs-k fli3il.- s)qysi ,ead 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 s aj*j7r1) xodqpeed of 12 m/s on the surface of planet X where the ar)dxa7 1jqj*o cceleration 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 of xe3 qqr 1;qg8qcze7e m9* gvb5planet X where the acceleration due tocxg3m ebv; *g578z1qqrqee q9 gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown u w4 p8m-d6cv9tz6b yckn38ofipward with a speed of 15 m/s on the surface of planet X where the accele f-k8pnt94y c6 m86wdcizov3b ration 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 surfacym *2 ;zsdtk b-+ouf7re of planet X where the a;mb yt uz-* df+kr2os7cceleration 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 hoe,zvu wvq9l7y kvtbqj7d + wz s:v(914lds a ruler between your fingers and releases it without warning, how far can you expect the ruz (vvevwq tsyj :+uq1b 9zwv74,7dkl9ler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its vyq *1z uk ec.l71qj0* ytvrvhfv+)ff 8elocity after 3ef1*cqk*8vf r7+yy1 tl.hu jzfvv)q0.00 s?

  A bullet shot straight up returns to its startipi,(5tu;w e udj4(d tqng point in 11 s. What is the initial speed odt,(i (5 qejt;u4pdu wf the bullet?

  A ball is thrown straig/p s9lgzhy utt: -3zh+ht up with a speed of 36.0 m/s. How long does it take to return to its sttygsp9z 3u-+zthh:/larting point?

  A ball is thrown downward from the toprz74ji8js ity6hb)t4e2+hc t of a building with an initial speed of 30 m/s. It strikes the ground after 5.8 s)4+j hi8tt6e2jcytz7h s r4ib. How high is the building?

  A ball is thrown strai zboiu2, -cug5:1 ukgtght up with a speed of 30 m/s. (only fill in numerical valueu5 2:ik ,ucg- tzgubo1 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 stracvc.aj ;n5 hf2ight up into the air with a speed of 24.0 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity af,1os55w qqt +8ph/z zb r:zsc3b t4gbt t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.51f da ax6r+:8ua au:hz s?

  In Fig. below, what is the veaz2suzkg.mxd5: : 8, aoiote0locity at t = 4.0 s?

  In Fig. below, what cvcaxr;w6 rqae- o 1lb w. b7x;i0y*d2is the velocity at t = 5.5 s?

  In Fig. below, what is the averagei4tin 5:j0 coy velocity from 0 to 4.0 s?

  In Fig. below, what bp*t 4mjdpk/2is the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration 2uqiifs +i3((s xes-gat 1.0 s?

  In Fig. below, what is the accelw ( e2cu1y*1 pyewd)gceration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s?fsok++dv2.ns2 zp 0 ov

  In Fig. below, what is the average accel1bby 4i5pjn*f(y mu0qeration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 t5 inlf;4 djtp*o 8.0 s?

Does a car speedometer measure speed, velocikt(wdix7obq +j wbd-2 4ix- )mty? {speed|velocity}

  An object can have a varying speed if its velox w)q(oc;zi1jcity is constant.

  The velocity of an object can be ne9g3:a7eme81q9 a:2o xedckm ix 7hkyzs ikh54gative when its acceleration is positive.

  If one object has a greater s nkc.+ af51qojpeed than a second object, the first must have a greater acceleration. jkn1+ qo.fac5

  Two cars emerge side by side from a tunnejy49d ejrp i*qorxdo /(f r(3.l. 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 in speed as itpj,sbn6 6*uufll s0b .)/ socbs acceleration decreases.

  A baseball player hits xyab 6i6 59nijkyhshjf.)9) w a foul ball straight up into the air. It leaves the bat with a speedawfxi66b.jyh 5n ih9j ) )9ysk 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 accel.t7mmv t+7+ zupxdj+srze4z6eration, how does it change if air friz4t6dvzm+sr u7p+ exm7t .+jzction is ignored?

  As a freely falling object speeds up, what is happening to its 3uzq3rbll p20acceleration, how does it change if air frictioqpl z 3l2r3b0un CAN NOT be ignored?

  An object that is thrown vertically upward9hp 4rk-td*k4z ei)wd-37ufbb ,b5si jkp 5 ec will return to its original position with the same speed as it had initially if air resistan4db zpbiwk5pe ijtec9k,3 -ufk5 4d-h s)r7*bce is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acwc .t:4lbvq:xb i/iu:celeration at the same time.

  An object can have nonzero velocity and zero acceleration a-lyj2tdp /g,o3x .r4.dqioef t the same time.

  An elevator moving from the second floor to the fifth floor making no st q2ec/xzmjr qivr0 3(o+,rx k*ops along the way has zero acceleration all x(erjro+ kqxvr ,0z3 qicm*2/the time.

  A rolling ball moves frizr jsulm()ii5o 2 clh0r2g 1;om $x_1=2.6 \mathrm{~cm}$ to $x_2=-5.7 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ 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 $t_1=-3.1 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps armt.g;bio)xudy(fqtg7+09 ahfc sz/, ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trai cu4r+tmu9j 1cner in a straight line, moving 97 m away in 13.7 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) itruc9ut 1 4mjc+s 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 from- zxqs:poe)0ma o )8mc $13 \; m/s$ to $22 \; m/s$ in 4.6 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 fromv6del-i1 v;,l lfe.ar $17 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sp,p /fbn7 ,x*qxopf-mleed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to esse3:cipuw-e h d8ntially top speed abouwh38 epd -ciu:t $10.7 \; m/s$ in the first 13.8 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 s5em t ::p gv,ag-s3mrypeed of $17 \; m/s$ to rest in 4.80 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. whd1,46ockehy04 ht0vd ofx 1ife31 y Assuming a deced vyhf1ko0et 1x 4h1fycd hi,04o6w3eleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gtd7e:3 zpr h5noing $25 \; m/s$ 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).    $m$