Suppose that an object travels from one poio gse5:dm eo7/t*foj/nt in space to another. Make a comparisono mt de/j of*go7e5:/s between the displacement and the distance traveled.

  When is the average velocity of an object equal to /k3) mmq t 1vd8w(q*aa1nkqvb the instantaneous velocity?

  A new car manufacturer )c vhk 2g0k3;qlz81 rsfcb//vqg ztk4advertises that their car can go "from zero to sixty in 8 s"8/tk3c/ h2 1b0lg zq;z) gvkfr cqsv4k. This is a description of

  An object moving in the +x axis experiedpts1hgy/* r g)04g zynces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to thbw)a otmom:74 t*r 62xz/ceez e East (+x direction) begins to slow down as it approaches a traffic light. Make/ t*67zzor4m:eewmb2cxa)to a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sh4c4 c. rpe r.lqa+6qulow down as it approaches6cq4l.ac+h e4q ru p.r a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Ma:( uo21 jasekvke a statement concerning us1:a2k eov(j its acceleration.

  If the velocity of an object is zero, does it mean that the acceleratioxpg q3i47soy5lpy-c/vw22 y p n is zero? Support your answer with an 2 54 pyxp/g37cqyvw2lopi- ys example.

  Can an object's velocity change direction when its acceleration is constant? S6x9 p tpra0insyu47 7nuppi 4n7u7tr psa0xnyp96ort your answer with an example.

  Suppose that an object is moving with constant5y5whrpv .a gveo;ivy7 58bm3 acceleration. Make a statement concerning its motion with respect tgomiv.58ypyhrb5 ev 3 7 av;5wo time.

  Can an object have increasingt:ncw:.t,o0 - :+ip m fbmef; .oavlgl speed while its acceleration is decreasing? Support your answer with an exampl.+am0l tb;icm -p:,etofv. g:of lnw:e.

  Suppose a can, after an initial kick, moves up lck5bf v+7g; nalong a smooth hill of ice. Make a statement concgl;f5vk +7 cbnerning its acceleration.

  Under what condition is average vela9m o sxqz4s6qqa /u7x6 uh u6n+kz8.gocity equal to the average of the object's inixhasn+q76q9mu8 6s ux / 64z. azokuqgtial and final velocity?

  Objects A and B both :t p;q6xer nf fz2)u, 2;e*lv6cdfliwstart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object Bdl6i6w;)qr :z, cpxe2tvnffl;* uf2 e. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. Thtp; jfh+w/r,)d-ukiaq ge81 wey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance travejw;wi r a-,pgfe+d tq8/ 1kh)uled by object A compared to that of object B?

  When an object is released from re*:ws+(+ x mqwwpmn(xc st and falls in the absence of friction, which of the folsnm (wx+ *mww +:xpc(qlowing is true concerning its motion?

  When an object is released from ressoq1g*, gh abhv;ik/wto) 7h.39upez t and falls in the absence of friction, which of the following is truea*wpq o,hv7.tobks/;g13e9 h)iu hg z concerning its motion?

  Suppose a ball is thrown straight up. Make ocr 1pttqj0j97bg)jz uh*bedo2w3 ;.a statement about the velocity and the acceleration when the ball rea.ptgcedu1h9 w0t2b ; j3 obr)oz*q7 jjches the highest point.

  Suppose a ball is thrown straight up. What is its accele 0we9jdeyiz2)c;2x xj r,1 nb2fasvg/ration just before it reaches its highesi2fabz;2j0/xnjveds) 2wx91y, ec grt point?

  Suppose a ball is thrown straight up, reaches a maximum height, thexqv 01/,t wzrln falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goiv,1q0 wt l/rxzng up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initiauk)vp.,4 l rpdl height. Make a statement about the direction of the velocity and acceleration as the ball is comi4 uplv) ,.rdpkng down.

  Suppose a ball is thrcxzm5w-+ 5zhrown downward in the absence of air resistance. Make a state5rcmx-z h+z w5ment concerning its acceleration.

  Suppose a skydiver jumps from ufq8d ks2vvcifdxci+s /u ;k*ct) 8 91a high-flying plane. What is her acceleration when shc v )xsuc9;*8v8fsckqd2+1ii f t du/ke she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball ioh4-aag1a9ga5qe r7g 6fxa 9fs 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 sxa 95- g7g69aohaqa 1efgf4raecond ball go than the first ball?)

  Ball A is dropped from the top of;-kcx2- lp8mf km*cke a building. One second later, ball B is dropped from the kl*8m m ;f-e kxpc2kc-same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B i:rl yi9kz(vub:h(0 x6m8ha mbs dropped from 8zhkx9abm0yv(ui :: h(r 6mb lthe 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, and tb8 xh68p(emh1bz)1 8srr w khthe other is thrown down, both with the same initialrw1 8 h8shz)( rex8bh1 mb6tpk speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A se:sxsvu 3 i(2if yowq*eg:t f7+cond brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two :xs f7i*+qe:gfoy s 3u2v(tiw bricks.

  An object is moving with constant non-zero velocity in the +x cuf mai4 s awgs5*7x:6axis. The position versus time graph of this object:5* 4a as ufxm76sgiwc is

  An object is moving with constandqh: kweat n7m, iell* 43)w8dt non-zero acceleration in the +x axis. The position versus time grae 7*h dd,wal3:4kmleiwq8n) t ph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocity ):rusl fygmhqj r o6o.a64:l8 versus time graph of thisohm sg ll 4q6a oy8r)fr.::ju6 object is

  An object is moving with constant non-zero acceleration in the +x axis. s1 , fn272,dfwaj, ceo+erivi The velocity versus timer nwdfsae,7e1c,2v fi+j io,2 graph of this object is

  The slope of a positioklzmy1 9 /d,mo4+ywjm n versus time graph gives

  The slope of a velocity versus t fy 6qxm541ff+/ lybgr y:usd/ime graph gives

  The area under a curve in an aco3ez:ch:0vb vv-m f9kylx; p*celeration versus time graph gives

  The area under a curve in a velocity versus time gi,p4rb0k* rzdw h / ww.ox(cs(raph gives

  If the position versus time graph of 2 s7ruwe95t xfan object is a horizontal line, the object fs27u rwex 9t5is

  If the position versus time graph of an object is a vertical linej /za e3py-f5a, the object is5fzaa3 ep- /yj

  If the velocity versus time graph of an object is a horizontal line, the o*5 v8,b klpd+e qsu7*r h1chepbject i,buep75 vcd1 8 kr*hphq+ *sels

  If the velocity versus time graph of an object is a straigzi f;:w+j8 bx ;qbv5 wsj0nj5zht line making an angle of 30 de;+ z:5wsbx0qb jvfjj5; z wni8grees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Fintheva/*+n vn)lz/ia 9nh/pq.d both the distance traveled an azvhae9nn l//*iq/n+v h)p. td the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wilaen8 hja;7 e-rce8 s8v;.hufh l it take to move 12 km upstream in a riv ne8chh 8;ae.;-87eaf ruhjs ver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1tsle7 o fs8i*;*qya d+609 m)

  What must be your average speed in order to travel 350 km in 5.15 gix9u5,t6pe )sqvkzbssm4x n,/5 hc ,8lkxu-h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours 0 wexc-0ymz/ eand 57 min. What is t0/ ezmy ecx-w0he average speed of the runner in m/s?

  A car travels 90 km/h. How long does it tayxsde yvh/ 3lho57r4.ke for it to travel 400 km?

  A ly (light year) is the distance that light trav)owx4 tpz v6vsi-,r g6+xw-ug els in one year. The speed of l tov ),swg6pz-4 v+x-urxiwg6ight 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 you look to the/e0f h -a ujk(h f-9djd,7mprb side for 4.0 s, how far do you tramj 0f7urf-hpk 9,h(- /ejdbdavel during this inattentive period?

  If you run a complete loop around an outdoor track (400 mznh,la w+gi7+ ), in 100 s, your averagni,ghw7z al++ e velocity is

  A polar bear starts at the North Pole. It tgfwxjx. .(7q,2 ovvb9q;b / me3cvqwt x2 zh8gravels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting p w2gvm.xfqbtq,2 7o98x(z3xec / v.q;bv hg wjoint. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km sowty4ynhfaeht 03 ;x5(uth, 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.thwtxahn540yye 3 ; f( What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It then f5 4xk4zrk/o/dsg zd4 starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 4/zf4kgsdzkx r do 5/4minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h ao -k e* zuhchp):la);knd 160 km at 100 km/h. What is the average speed of the motorist for thisaokehcl-: ;uz)kp *)h trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her a )kh1dh*yxup+j- uujx3 6u)9tuq4 pduverage speed fxdupd*4h+u391 t x p6)u hkuujju-)qyor the trip?

  An airplane travels at 300 mi/h south foru-nb f,rl (;w*,eqwgp 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for r*e,;w(p-g ,lw qbnufthe trip?

  In a 400-m relay race the anchorman (the pes qy*5ro(a7u arson 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 so*75(ur qaayteam 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 after 11 s. bbk6tl+jm) t:/w40a cvzg c b*The car's average velocity during deceleration was 53 km/h. What was the ca wzv4 :b/lj6b)ck*gmca t0bt+r's deceleration while slowing down?

  An airplane increases its spenni 2+pnaxb( ej.t n)3ju9om. ed from 100 m/s to 160 m/s, at the average rate of 9aj(2mu 3ob njnnixe +tn..)p $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra hqr6kzz -wv6/te 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 a4p xtf0gzu15p uocr hc8nn.7: ccelerates 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 23b-epm-8wv t3kfz3q iy v16t- vmsrws. It then speeds up with a constant accelerationvsyi3w2r v-6t3f-b3mvmw1 t-k8qzp e 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 7.2 m/s experiences a constant acceleration m+vvxj( hb p/)y.:uai of +i. )jhvvy/ :mpbu(xa$4.0 \; m/s^2$. What is the cart's displacement during the first 9.7 s of its motion?

  A bullet moving horizontally to;ec4tlsa txw2ex a: 4gj6w 2x4 the right (+x direction) with a speed of 584 m/s strikes a sandbag and penetrates a distance of 46.70 cm. What is the average accelerationew:jlxstte6 x2 a44c2aw;g4 x , in $m/s^2$, of the bullet?

  A jet fighter plane is 3rn7 jco,8n ghbx8j x, t/t4nblaunched from 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. Ass 8xb,8nbn/tx hcj,ntr3ojg4 7uming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant aca8v l v 3qn6m.rba4/0bgikqj 7celeration 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 distanmn,3 lst kk(8nce of 200 m. What is its average accelerat 3,nnlt(kmks8 ion?

  An object starts from rest and undergomkb-.fiw, o.fes uniform acceleration. During the first sec bk., ifomfw-.ond it travels 4.8 m. How far will it travel during the third second?

  An object is moving in a straight line with conlh/yxbs( .- gq glci;xm;e6x3 stant acceleration. Initially it is traveling at 16 m/s. bmx h;-ll;exgsgi3 /q.6yc(x Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates ungp :tycha4 0i9yc)rl -iformly 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 decelerate ata4yj 9q h5n;kv 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 nu 3 txc/b6ev+:fb-co light turns green, a car that has been waiting at the intersection starts ahead with a constan 3fu6/ n-bvo+ x:tcbect 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 oq8 ygb58xexv .f planet X wherevg. 5xy8xbe8q the acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwegfiis0 9w7fkiq+ , /cz(v e9card with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity isw90+ ice,vfe9 igz 7(/fisqkc $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown uplg :5bjl hvar+p.// iz0wyn8p ward with a speed of 15 m/s on the surface of planet X where the acceleration due tgl./n:+rhapy 5zlb0v/ pw8jio 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 surfacevcht 4k 1ry )jsc4sl*( of planet X where the s()hck4 4lvtjc sr1* yacceleration 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 friend062jd dminbon) *na7c holds a ruler between your fingers an0dm * 2oc)n ajbn7ind6d releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at komhs h.un: qu3pj.c 879eza5 a velocity of 19.6 m/s. What is its velocity after 3.007kqh ce:u u3p9zh o.5as. 8njm s?

  A bullet shot straight up returnh1tf 9 sxtw46es to its starting point in 5 s. What is the initiah wsf4 6ett19xl speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s17 +xnk* w63dq l25guuac fddw. How long does it take to return to its starting *l7d3cqnx1 u gdk2a+ww6 f5udpoint?

  A ball is thrown downward from the top of a building 9b)lcwg8cnzr5mi/ yt5 )k6kowith an initial speed of 17 m/s. It strikes the ground aftcw 5r)gktl oic 69mn)kz 5by8/er 6.4 s. How high is the building?

  A ball is thrown straight up with a specead0 bv 8*zh0spp r.,f0cyr2ed of 30 m/s. (only fill in numerical value in thearbz. rdschcye*p p v2f0800, 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 straight up into the airdk 1/qipc l;x2 with a speed of 39.7 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity atl4ga5i3 is 1gi t = 1.0 s?

  In Fig. below, what is the v1i u bu,oy5v3relocity at t = 2.5 s?

  In Fig. below, what is the velocity ati;z4pgym0jb cu037 .ndv7 2 ra)gxnic t = 4.0 s?

  In Fig. below, what i2fgogy6 c b )xqvta8go;74e6p s the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from dnhi -6igqc/ 2(e3xji0 to 4.0 s?

  In Fig. below, what is thelus+ a(z/hutvs:0iflem c t-c 4 5wb7* average velocity from 0 to 6.0 s?

  In Fig. below, what is the s34c nd0 wl .fn;chw4zwk/bo*vs77u p acceleration at 1.0 s?

  In Fig. below, what is the acce,d-ii4, :jznljq g1yc leration at 3.0 s?

  In Fig. below, what is f 860po jh0ejpd5*c csthe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 9np jm/9yowd) to 8.0 s?

  In Fig. below, what is the7t l ,1nyt31 8ojhvnjr)+xj6xf:lcai fc+f 7h displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velq9:k5 q vrfio) xb(m/b0oli ,xocity? {speed|velocity}

  An object can have a varying speed if its velocity is constant.) w+s w)jj.nmb

  The velocity of an object can be negative when vq; u0er 5n,vqits acceleration is positive.

  If one object has a greaterusyq*6 ;pyc(i4 9e)nrw3jytq speed than a second object, the first must have a greacyyqpuri46 ne*3tsq)j; 9w y(ter acceleration.

  Two cars emerge side by side from a tunnel. Car8:2p ; 0j3:ilmm tv tlcuw9vfp 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 accele7fbh j.jnl(h39bh :s sration decreases.

  A baseball player hits a foul ball straighh3:85tud blxk4ggi+o t up into the air. It leaves the bat with a s8k b3 +o5xdlgutih:g 4peed 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 acceleration, hl,ssonz1 :wqw: y7;y0d .dzcq ow does it change if air fri w qzqy10y,nlsw7zcdod: :.s ;ction is ignored?

  As a freely falling object spr+ wz+vjs*r /y 6bdff0g./yqs eeds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignored?bg//+ rwf0+* dryyfsvq.z6j s

  An object that is thrown vertically upward will return to its origjla*k:giy1 yj0 5az)he( a f1einal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result bk)* gyay1l0j :e (a5fhieza1je altered?

  An object can have zero velocity and nonzero acc7cvk (q2g 424wjztg uteleration at the same time.

  An object can have nonzero velocity and zero acceleration at 6-n /f nktkq0qthe same time.

  An elevator moving from the second floor to the fifth floor )rsa2;bfm9eec bm91h making no stops along the way has zero acceleration al ;9ea2)c1bbmhmf 9s rel the time.

  A rolling ball moves :.eaq -0 4g pmxgnfr(ufrom $x_1=2.3 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=3.0 \mathrm{~s}$ 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 $t_1=-3.8 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quamn i76 zjco,n.xtx r5w60-zyoo i9 kz:rter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.0 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters awaymw g4 my.)1m mxufkg2; from its trainer in a straight line, moving 101 m away in 11.9 s. It then turns abruptly and gallops halfwm4. ku m2ygw;x1g m)fmay back in 4.8 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 from xg nrl (;1zut3$13 \; m/s$ to $24 \; m/s$ in 5.8 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 frops m961/fyrm67 7 eerkn/wjs5tjf i0xm $21 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rba,vi4c 0ffecnv,6q1 each a speed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the bloibl(( xx :mzs*cks to essentially top speed about*(ixxz(lb: ms $11.5 \; m/s$ in the first 13.5 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 (qvm j:4ihyso e 0,c24epd;5hk*phzzfrom a speed of $16 \; m/s$ to rest in 5.27 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks ,i1nx5s/*x26np o zt, wegxnv 92 m long on the highway. Assuming a2tsnx,px *1, n z6 /5xwgoivne deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going4 kd f16 urzbv)7n(ang $25 \; m/s$ 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).    $m$