Suppose that an object travels from one g:- njgv;eoy :pkp-t3 point in space to another. Make a comparison between the displacement andtv3gkn- e:jg- p:p yo; the distance traveled.

  When is the average velocity of an object equal to the instantaneous veloc r6wb,kh6yj jyso0v bb;ostz 2 ;j:g58ity?

  A new car manufacturer advertises that their*pj (i f-n/gdx car can go "from zero to sixty in 8 pfdgn j/(*i-xs". This is a description of

  An object moving in thex v6 /pq.zo9cq +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling vx updaph6g4r. rv :)0j .if8qto the East (+x direction) begins to slow down as it approaches a traffic light. Make a.:4 rhjravpiux0g f8 d )qvp6. statement concerning its acceleration.

  Suppose that a car traveling to thea z83n: w5hexyict) c kz.k5 u;e,h;rg West (-x direction) begins to slow down as it approaches a traffic light. Make a statement conc;5ywke,a. gczutezh3; xrnhi 8c :5)kerning its acceleration.

  Suppose that an object is moving with a cons +8mt xp6a ikgjrh86(stant velocity. Make a statement concerning its accelxrg hm8 akt(ji6p8+s 6eration.

  If the velocity of an object is zero, does it yr7dx fxoku1t 13;wy5mean that the acceleration is zero? Support your answer with an example. 7x35k1otyr1x ydw; uf

  Can an object's velocity change direction when its acce m pbc4xs0.2hnbj9tc 0leration is constant? Supportjb0 t.h 09mccpx2ns4 b your answer with an example.

  Suppose that an object is moving with conhsi,0ll j85 dkstant acceleration. Make a statement concerning its motion with respect to timeidsk0jl,8 5h l.

  Can an object have increasing speed while its acceleration is dfg58 e5zrsgmx l ;04pcecreasing? Suppor54 zcglm 5rpxf8g0 ;set your answer with an example.

  Suppose a can, after an initial kick, movesc3e t/l nt(,n5):xadhlos p6m up along a smooth hill of ice. Make a st l p5n/ n(mahcd3l)e,xo st6t:atement concerning its acceleration.

  Under what condition is avesvlc)5;a 0ght rage velocity equal to the average of the object's initial a s gcltv0a)5;hnd final velocity?

  Objects A and B both start at rest. They both accelerate atlqh4-8scau )zgzlmy1 el u1-2 the same rate. However, object A acceleratel1) auz2l hus4ge-z8y-1m cqls for 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. Thjks0z9; c3 tu:i7mifi ey both accelerate at the same rate. Howeverkm97 jf; 3suiti0ic z:, object A 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 released from rest and falls in the absence of frict7oaz +m*i8u z /y 5zzpql1iy2eion, which oqzeu*i7a imzl/ 28z1y +zp5oyf the following is true concerning its motion?

  When an object is released from rest and falls in the abwkc-sid,iw e. ke*h, ;8f5pmg sence of friction, which of the following is true concerning iec wds;,5km*,g k . 8piwh-ifets motion?

  Suppose a ball is thrown straight up. Make p2ba0y6 yi9l lf6; 9owqyxp2ea statement about the velocity and the acceleration when the ball reac2 6l fiq y6bpy902 ox;apwey9lhes the highest point.

  Suppose a ball is thrown straoem;ov 6 1nxh,ight up. What is its acceleration just before it reaches its highest poixm1ev ;o6o,nh nt?

  Suppose a ball is thrown straight.-cr h9t ub7aw up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is go7 hba t9w-ru.cing up.

  A ball is thrown straight up, reaches a maximum hei9yj;o 5l-b.ho:p kg:od3eye v ,xa9tught, then falls to its initial height. Make a statehd; 3byego9: eoaxt,lk5j9 yu- .vp:oment about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistl8t-vwcx. we o9h10uk :hzs0.io t,ga ance. Make a statement concerle8t,o1.stu vw :wh.h9z xka0c go 0i-ning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Whatm)l: h3 zumev; is her acceleration when she:; luhzevmm3) she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical sec l ww, *yx9spe/f2tq+tond ball is thrown upward with a speed 2v (twice as fast). Whap*/e9 txft w2wqyl+, st 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 buildid.we57b7f (ab kumu*b t0tda;ng. One second later, ball B is dropped from the same building. As time progresses,fabk7awu50ub *tb mde.dt7;( the distance between them

  Ball A is dropped from the top of a building. One second later, ball B(x:m bw,ji u 3g;nvt7t is dropped from th3t(i wug;x t:mnbj,v7e same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, nuiin51 qfl a ar937(yzf8n0j and the other is thrown down, both with the same initial speed. What are their speeds when they hit the str8rnf5uy i1(n i3j70 f9l aanqzeet?

  A brick is dropped from the top of a building. A second brick is throlog,qn 4xqnpt0 1 t 7nh1ww,9bwn straight down from the same building. They are released at n w 7hlnnq4w xgq11t ot,9pb,0the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with 8:mdy f d;1cios,t;azwt48j gconstant non-zero velocity in the +x axis. The position v ,dimsjc y4 ;f :z;odwtga8t18ersus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Tqsf e c(z/5yw25 0wq6egpwpaau o9q 7.he position versus time graph ofw5 w pe9w(opy. asce5q 76gz0qfau/q2 this object is

  An object is moving with coj b3s: s(.dktmnstant non-zero velocity in the +x axis. The velocity versus td :m.sj t(k3bsime graph of this object is

  An object is moving with const(avacg1n u 6l2ant non-zero acceleration in the +x axis. The velocity versus 2aav 6l1 (cguntime graph of this object is

  The slope of a position versus time graph gb: -; ccv8l)8qqzmhy+ aq7dqp ives

  The slope of a velocity versus time grd2f+,azwja i. aph gives

  The area under a curvl15d1v xlak;g ,gp )kqe in an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph g4q/p -j(ue ;;hwj btegives

  If the position versus time graph of an ob,ctr:i1wy3 znyplq1)lt2 l 4n f.fx0n ject is a horizontal line, the object il:wt0y) x1f4f3pn21cyrn.tlz qn, l is

  If the position versus time graph of an obje;r4vj rax/8 to kw/m-wct is a vertical line, the object is;rt4 r-mkwwjax/ o v/8

  If the velocity versus time graph of an object is a hg ka2)24 krf5 uop4irqotd+u3orizontal line, the object +o23oigk5)44drpk f aq tr2 uuis

  If the velocity versus time graph o27j9 isl5+md dcu *vmtf an object is a straight line making an angle of 30 degrees with the time 5ilctdvm 27 sj *+9dumaxis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance t ku0g -oeg,yk8x;j -firaveled and the e 0 ;fyoukg8ij k-gx,-magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How lon rl.p11onb 7zog will it take to move 12 km upstream in a river flowin1op1l7. rn ozbg 6.0 km/h?

  55 mi/h is how many mqnfm;/m8fz(+u8,webnj +nxl: sd;g u /s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km po08yb ;a-aq om3 n;5l,fleajin 5.15 h?

  A runner ran the marathon (9cm f i;g v)r;iq-zq gl+a,v*xtocj+ (qjb (5zapproximately 42.0 km) in 2 hours and 57 min. What is the average ;) gf(5(*qo jrb -jz+,;i mvicgcqv laq9xz t+speed of the runner in m/s?

  A car travels 90 km/h. How long does it take forvrsa;:xj s w e:fwakney* /;mi42n h(7 it to travel 400 km?

  A ly (light year) is the distance that light travels in one year.z q95d+n l og)wq/mrz 9n+cii+ The speed of ligz z++m)wnidro+gqc99 l i/ 5nqht 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 road7 m gl.;5crr8vi yf,ig and you look to the side for 4.0 s, how far do you travel durigl,7rvi 5mfi;8yg c .rng this inattentive period?

  If you run a complete loop qp5mh p/py9 r;k5:xblaround an outdoor track (400 m), in 100 s, your average velocity5mrbp;9ykq5h: /ppl x is

  A polar bear starts at the North Polempk35yn,3zu v v,:mgb. 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 aver,,vn :gmzu353yb vkmpage speed?

  A polar bear starts at the North Pole. It trq1 nbz2 2ubnqd2 rz1q .:;c67uuj ziaeavels 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 :d2iq1 7bz;rn zuu6jz. 2nbqe quca 12min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 w4ojx 9b :0dtomiles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is yodox 9tbw4j :0our hometown from school?

  A motorist travels 160 km at 80 km/h and 5vnjpf+ 7c ya3y6-xdv160 km at 100 km/h. What is the average spexd5vyyf cpn3v 7-+j a6ed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 ;h4t7ku)7 mgu xw3tfk di ef36h at 100 km/h. What is her average speed for the trit3 hxfw6u7g;)uk3kt f4i7edmp?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mc )ntik*9kmhmdk+q56p //j bti/h north for 750 miles. What is hdt+6tq/)p5jkb9 nk*kmi m/cthe average speed for the trip?

  In a 400-m relay race the anc+vrv3(a m 0g, 38bhca,*j iac alvego,horman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman forva3cg +ja0vbo8, g3l*(ha,ar m,ciev 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 not lose the race?

  A car decelerates uniformly and com2 ;uacawv jt6)l7c ;ayes to a stop after 8 s. The car's average velocity during a c)aa6l72v;wctuy;j deceleration was 46 km/h. What was the car's deceleration while slowing down?

  An airplane increases it t59jkxew3v 3 m-avc+ws speed from 100 m/s to 160 m/s, at the average rate of m+- 35jka9vv xcw 3wet$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thegm 0a g10yjae5 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 restaw )jel7(1omiu2 91exgjm2h r 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/s for 10 s. It then s63ic7 xoo) i)7o lee;r: chhbnpeeds up with a constant acceleration of rco xoini7c73 ):l6ehbe);oh$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.9 m/s experiences a constantf9oe3 jnr2 r5 t9mi(oo acceleration ofo r5e932jtr nomo9i(f $3.4 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontally to the :bc3/ m/u3a;xcghzzd/ e51wpyxpq + l right (+x direction) with a speed of 264 m/s strikes a sandbag and penetrates a distance of 56.81 c3xx+l; 5 u zyc//wcg3pbdaq/ :pe1hmz m. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrie; s/ido/5beif r. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceb/oi/sd 5if;eleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration o4w*z(*:vu sw9 mdv xoyf $2.0 \; m/s^2$ 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 dista1 ./5k/+h:qqe. hjc(gn9 upmgztakrn nce of 200 m. What is its average accelgqma t.5:.cne k9uj +hq(z1n/ kh/grperation?

  An object starts from rest and undergoeiw 3vg3j.rf:nn9 yckd7;tn , ps uniform acceleration. During the first second it travels 4.9 m.pn3wyj rf i;,t9kcg3.7: dnvn How far will it travel during the third second?

  An object is moving in a stra vux 1wmj6o1(hb0c80hy -a f9d migo0right line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 mm -coyvi(f 80jubh169orx gh00ad 1mw/s. How far does it move during this time?

  A car starts from restd au-rj x)xm ug,6n,*h 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 r mzku)-/ vb,6xkwu( xmoad 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 waiti e ;bvg;,zkt ; ;w2;nemeug:hvng at the intersection starts ahead with a;gmz;, gkveb;w :e2 te;h; vnu 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 sphfc.tlg q,-5( g,lk311iqf svd v1 wzpeed of 12 m/s on the surface of planet X where the acceleration due tofps1v5ighg .,d1tw1 c ,z(f3vllqk-q 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 planet X whe3tysm 3 y)mxo9re t3mxtsm ) oyy39he 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 speed of 15 m/s on the surface of planet Xkh-u2fkae - ;h :zxq5d where the acceleration due to xh 2ekd q5z-hkua:f;-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 1fh 1vgrax98ly m9k;3 s4 m/s on the surface of planet X where the acceleration d8xgvrh1y9mf ;ls3 k 9aue 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 -l0lc u3 q c:px xsnqz)u9)-hyholds a ruler between your fingers and releasesn uq)l) x9qyz--hclup:0x c3s it 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 ioyr2* qsqmhbd+.br n3:um1bv -+ 4uiuts velocity after 3nh:uoq b+imbq+ur 3*us .y-v21bdmr4.00 s?

  A bullet shot straight up returns to its starting point in 11 s. What is the inp2bicx w:h:t 1itial speed of tch:w p: 2bx1ithe bullet?

  A ball is thrown straight up with a speed +6ty +z2lxbb+c r- udtof 36.0 m/s. How long does it take to return to its starting pointublr+xtb6tz dc +y2+ -?

  A ball is thrown downward from the top of a building with an iniaed;ya-oi,5 6iay6o x91 ihwltial speed of 19 m/s. It strikes the ground after 2.6 s. How high 9- hioo1,a ;xdi6ye ilay5a6w is the building?

  A ball is thrown straight up with a speedw 8d.x2x( cy9i4cqje m of 30 m/s. (only fill in numerical value 8i9 xec mqj2dwx4c.y(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 stra bpm/28o(,ap1huzj gl ight up into the air with a speed of 44.3 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what a9zreli -gp s(uk7qzm 77m/q6is the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = h nau+ gbn2 g)dgzy0n: /1fhl-2.5 s?

  In Fig. below, what is the velocity aizbhu64 b aq+qd)wb6uaa727 kt t = 4.0 s?

  In Fig. below, what is the velocity at t = 5x8 nq(6c l2 ziv+h.lwg.5 s?

  In Fig. below, what is th jy-2:cl1 q 3on)wpa+paok cbuh68f1s e average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0o ,6 qm4- czxtf(-ucnp to 6.0 s?

  In Fig. below, what ij3 l. mzoo16qts the acceleration at 1.0 s?

  In Fig. below, what is the acceleration af t1j9tgucj dat6oz2id7 i0) 7t 3.0 s?

  In Fig. below, what is the average acceleration from iz:3ta l, lg vgbf*99y0 to 5.0 s?

  In Fig. below, what is the averabtorn c)- 2c.htrktx3; z0sy( ge acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to0jkd+u8k: m,zhg2jdcpv 0w6. ue y:qt 8.0 s?

Does a car speedometer measure speed, velocy(v,h swo2ysdm) o-c:g u: 5mtity? {speed|velocity}

  An object can have a varying speed if its velocity is c. l71vmmh,pkz7lv*plonstant.

  The velocity of an object can be negative when its acceleration is pon(c*dm llw33qsitive.

  If one object has a greater speed than a second object, the first must h( oyvnv6pu *d5ave a greater acceleration(5p u vnvd6*oy.

  Two cars emerge side by side from a tunnel. Car A is travelin1fbcb7z c/hdzzb+ c,blj6 73ng 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 spj6d0z6 buf: ogeed as its acceleration decreases.

  A baseball player hitvi j5 t,xkr(2qarmq.5s a foul ball straight up into the air. It leaves the bat wq 2k xmrvj,(.5a 5qtirith 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 happening to its accel:co * u;guab8ieration, how does it change if air friction is ignored?io u;8c:au* gb

  As a freely falling object speeds up, what is happening28qpd gn ,)m)y u4yecs to its acceleration, how does it change if air friction CAN NOTs8,ym)q g epynu dc4)2 be ignored?

  An object that is thrown vertically upward willvij1drgbtp+(k; )j* s return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this g )svk; 1jjpt*irbd(+result be altered?

  An object can have zero velocity aft-)n)4l 7mspjvzab- nd nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at v -4ltu.9 h)bijg/hj wp9)klathe same time.

  An elevator moving from the second floor to the fifth floor mak-aef+)yf 08 od1 irteping no stops along the way has zero acceleratd-f0) p1f irya8et +eoion all the time.

  A rolling ball moves b2, r4dqr.jfafrom $x_1=2.4 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ 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 $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-muw;dfymx ,m00ile ($1 \; mile = 1609 \; m$) track in a total time of 11.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer d;oyl.(2o6l a7dh 5ox,vp x5qkmw8qv in a straight line, moving 88 m away in 13.1 s. wpd(l vvm oq;86yolk7,hdoxxq. a5 52It then turns 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 fromu/ .+3(r zzp e3p/vb8hrwupvv $10 \; m/s$ to $23 \; m/s$ in 5.7 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 oywjxv+ 2 wu68d(end(3 e;s5 mgp0arsm $18 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach 6b odzif -sd9 .sjph93l0arh 4a speed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of thet4ox:+fivt)j89w:e ; j4rmg y;yord e blocks to essentially top speed aboutfj i+r8xr:ye;eyg ov4 49 wo):jdtmt; $11.4 \; m/s$ in the first 14.4 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 unihdj tr-np 9 1n7i:tg,hformly from a speed of $17 \; m/s$ to rest in 5.37 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a cb( 9r u czr(2v)1 qo5muafl1mfar leaves skid marks 92 m long on the highway. Assuming a deceleration of(ab c1f)ruumlf5mvqzo (1 r92 $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going 0v.,jpun1hxpil1; cv)yeu j 7 $25 \; m/s$ 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).    $m$

  A runner hopes to complete the 10,000-m5 zpi vx:l/oo6v hf4e +nc57hz run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The izf5ne6v+/vzhox lco h7p :54 runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$