Suppose that an object travels from one point in space to another. Mak4m2/5; )ofbyb-wdk gj:v xvsae a comparison between the displa5/:b4akgo;w ) vv2jsm-dy xbfcement and the distance traveled.

  When is the average velun6u/aantmk9a 5nm 4v56. dhhocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero tj 7w2y) 94fj cegn6jteo sixty in 8ntcgjw j) 7ej92y4f6e s". This is a description of

  An object moving in the +x axis experienc5-vabecz6e +69vxwmm 0x. i mbes an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x d m z6p0wwj+5gyirection) begins to slow down as it approaches a traffic light. 0 56+zgpjywmwMake a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down as/)n/ pcb ckl h0vg/6rz it approaches/nbcr/ zg vkp0l)6h/c a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocityfyio, ktt*40(hk u ae0. Make a statement concerning its acceleratitu ,4yk0 0eihk*aoft(on.

  If the velocity of an object is zero, does it mean that the amr b0 ew+;14; i5tlld3xapv 5qw7bceycceleration is zero? Supp vym;wdelil35b504 qpxt+w b 7eca; r1ort your answer with an example.

  Can an object's velocity change directionlv-b3r7 oir; vcs23yl when its acceleration is constant? Support your answer33sl ylv2 bior-r vc;7 with an example.

  Suppose that an object is moving with constant- llj irsbmr2bd)gz7v37 v.q . acceleration. Make a statement concerning its motion with respect to tb-d s2v7g zq.rm r.7l3b)ljv iime.

  Can an object have increasxfxh,:qm )o w9ing speed while its acceleration is decreasing? Support your answer wih,9x omqxf): wth an example.

  Suppose a can, after an initial kick, moves up along a smooth hill o+p/jp z w/ lr8e9)a;0m1mbc neob zm1lf ice. Make a statemo0w p;z+mzm8 e1cpl1l bbae /)jmn/r 9ent concerning its acceleration.

  Under what condition is average velocity equal to t()ux j ea0f1 5,amqmyhhe average of the object's initial and final velf(a5)ymq a mxuj10eh,ocity?

  Objects A and B both start at rest. They dv 0pb6 en3md4both accelerate at the same rate. However, object A accelerates for twice the time as obj 6mb0d3v nep4dect 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 at the same r 7+v2;qy yypdunum:e)+q1 p ggate. However, object A accelerates for twice the time as obju 71p)+qmngqv ey :y2yp+u;dgect 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 friction, whic61vjabv(na g.hsxl3o602hpwh6lvag.n6jxa1vb ws3h0p2o ( h of the following is true concerning its motion?

  When an object is released from rest anzqs . :iq o,a pc(d96dpw z/jlw5ng/.pd falls in the absence of friction, which of the.jspw 6dd:i5za.,9o/qlp(g zc q / wnp following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a stmwwr6)vp*g y;atement about the velocity and the acceleration when the ball reayw)6 v*p g;wrmches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration cf 3u:+f x4kif;opyf5 just before it reaches its higcf3yo:;upk+4fi x5ff hest point?

  Suppose a ball is thrown strlf(e d; s.r)a.*y*cms: clj9y-ebvvjaight up, reaches a maximum height, then falls to its initial height. Make a jylsv f .ryv( e)*e;lj*dmc.s-c9 b:a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, ty3i6wui/ baim kv lg;+ s027vptd 2 rw.mzkn64hen falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball ism v 0tbp6 izim;sku23lg6 r dn7aki 2+.y/wwv4 coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a st de29k-kv:oqzatement concerning its acceleratiz-e :okvq 2dk9on.

  Suppose a skydiver jumps from a hy /a*+l .dpameigh-flying plane. What is her acceleration when she she reaches tera+ l.e *pyd/amminal velocity?

  A ball is thrown vertically upward with a speeab t.woyrb ,fxh6h3 coi-j5p+q,33cxd v. An identical second ball is 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 higheraoh,iy3 px+ qf3,ob6-w 3c.tch xj5rb does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One seconvh2 4zn u(sic cw8w:e.d later, ball B is dropped from the same building. As time progresses, the distancsi (nh :2cv e4wwcz.u8e between them

  Ball A is dropped from thel*te a5 i(d:lo obonn*m h3a+2 top of a building. One second later, ball B is dropped from the same building. As time progresses, the n :ta*neiooo* 2a+5bm3l ldh (difference in their speeds

  Two objects are thrown from the top of a tall building. One is throwne l2h7)9f/wd*hzjr-qnq 1xog h39 ( v9lsfpp y up, and the other is thrown down, both with the same initial speed. What are their speeds when they7w9qs)g j3fd-lpnlh h ( *yzpv99xho/fer1q 2 hit the street?

  A brick is dropped from the top of a buiy0ez r0,s4to8.hu9* ruo4tb7,m bsw ) rebahmlding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect ae4)wbhy,r7mmzs8 oeo.ubtaur h, 0 tr0*bs94ir resistance. Compare the accelerations of the two bricks.

  An object is moving with constant au(w(vwid9u4 non-zero velocity in the +x axis. The position versus time graph of uuiw4va(9wd ( this object is

  An object is moving with constant non-zero acceleration in the +x axis. The posxs q ao/ke/37fition versus time graph of ths e o3fq/kx7a/is object is

  An object is moving with constant non-zero velocity in the +x akd0.1td-xhg g xis. The velocity0xtg dd.kg1h - versus time graph of this object is

  An object is moving with constant zslah:0/8za t non-zero acceleration in the +x axis. The velocity versus time graph of this object it0 :azz8lsa/hs

  The slope of a position versus time graph yn-iz6+zz i )xgives

  The slope of a velocibh8z4nxz.ojyvl/9 4d o, a re5 ,,kxctnbmy)/ty versus time graph gives

  The area under a curve in an acceleration bxv+if)no0 h *versus time graph gives

  The area under a curve in a velocity versus time gdd(u4fss n6-zraph gives

  If the position versus time graph of an6*:s cs1xkbr8 ueox /s object is a horizontal line, the object */cr 8: u b1ksssx6oxeis

  If the position versus time graph of an object is a verti b+3lc /sk6vd)gj:v2n9ef 5gil rvfi 7cal line, the object is76r2 niceksj9+v l/f5v) 3gvi:d bfl g

  If the velocity versus time graph of an oq) 23: f6 qlsumhzqwnl7n3 wc5bject is a horizontal line, the object is wn:q3h l6n5m wl723qzqsuc )f

  If the velocity versus time graph of an object is am+1+*ngpp) re/ezg fu straight line making an angle of 30 degrees with thenugp1pg )/refez +*m+ time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the kjgg z ei57wsxgi14;7distance traveled and the magnitude of the displacemis 7x e1;w7gjk z4gi5gent vector.

  A boat can move at 30 km/h in sti6 y3ahai88ju r28nny 3 -avihvll water. How long will it take to move 12 km upstream in a river flowi8i nh 336ua8j vy8anr2hi- ayvng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1d *q*92nylyow hd/f1i609 m)

  What must be your average speed iwiq9l2hu /u gl)) c-ctn order to travel 350 km in 5.15 h?

  A runner ran the marathon ) npl8oxjszwjq6.z; :(approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the rpxn)jjz8:ow l;s6. q zunner in m/s?

  A car travels 90 km/h. How lnh i8. xd02uv-3mr cxnong does it take for it to travel 400 km?

  A ly (light year) is the distance ,uua* f8 h8k4canabc+that light travels in one year. The speed of light is,ca8kf8aab 4c uhn u*+ $3.00 \times 10^8 \; m/s$. 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 theyq0 u,br 2q7 dnay)ae) e9gt7a side for 4.0 s, how far do you travel during 2)9g 7r eynaa0uqeq a7bd, yt)this inattentive period?

  If you run a complete loop around an outdoor l1/nk2zftfl9vt0 fa9track (400 m), in 100 s, your average velocity l fz0 taf/ fkvn299lt1is

  A polar bear starts at the North Pole. It travels 1.0 km south, th s+ /oyzt 6g/6u( rcu, c(5o4fjpfneieen 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. u psef(y65 uc cj,6gerfzt(noi/o4 +/ What was the bear's average speed?

  A polar bear starts at the North Pdl ygeg,r3 .hw7kzjp j01d.5t ole. 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 .g 0 kjd 3tezp7hw1yl,5jdgr.. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekz x qo;jx-a-fj,et55s end from school at 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 minutes. How far is your hometown from -xs o jx55-, e;atfjqzschool?

  A motorist travels 160 km at 80 km/h and 160 km at 1004v5 c+l dmor)g km/h. What is the average sp5do4 l)m gcr+veed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 kkqiog5b;d 4+gm/h and 2.0 h at 100 km/h. What is her average speed fogbk ;+gd5i oq4r the trip?

  An airplane travels at 300 mi/h south fi,y61s ;r )yv61 zf )uuubblhb5a8jcpor 2.00 h and then at 250 mi/h north for 750 miles. What is the )zpa 6u1j1)i l;busy85rby c6u ,hvbf average speed for the trip?

  In a 400-m relay race the anchorman (the person who ruwe n. 49fe7hw ilh/n 58okau.zns 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 team B runner can have when the team A runner starts the final leg of the race, in order tha z587.kha9wuofw4eelnn hi / .t the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 9 s. The car's averagt5yw6a-e hvg0 o.o1 pce velocity during deceleration was 78 km/h. What was the car's deceleration while slowv-.ho a61gyp5oe0w t cing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averagvg-s t2c+rx.y w4rilx+ a9k,2biit1a e rate of g, b2yrw rx 1+c2is.+4a9 ktiavtxli-$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate/;ks*vdb.epp +5 hmh hv sa 2mnxe5 rh:wt08x0 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 acceleraeb-y;gn jb3 (yd5lo /8p,a zhutes 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 gvtl)jty:;3 ok+i+ nc8 :jxm rspeeds up with a constant acceleration of ck)l;t g :x +3ni8t+mjovyj r:$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initiys n**lap0hdu9(ea x/q7 0zwfal velocity of 2.6 m/s experiences a constant acceleration of (e9x ua ad0shfz0p**nq7l w/y $1.3 \; m/s^2$. What is the cart's displacement during the first 7.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a ) tyw/en* p5idspeed of 568 m/s strikes a sandbag and penetrates a distance of 24.47 cmpty*i wned/5 ). What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft- avi4y5)l sfw carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requi )afs5-v w4yilres 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from reszsi2 rfhs+s2fys 2b2*t moves with 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. What is k +f9jmkcnv :o0pbb1z9 fjbcu4 5 u0i1xj0b2iits average acceleratn:ifojmfju 1b49002ujc ikxp5 b9zk+1bb 0vcion?

  An object starts from rest and undergoes uniform acceleration. Du+eexqiv6 r -m1ring the first second it travels 6.3 m. How far will it trav xri-v+q 1e6meel during the third second?

  An object is moving in a straight line with const x ,.sbrpvn:/jant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is tr,: .vxnrs/pbj aveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at z(m(w;/ohq. pt7fbx iiyt-d0$3.0 \; m/s^2$. 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 d5.jefeer 48 9 r,kbvjg1f;wlroad 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 cd*t* atjv( 4ha 9ki/iiar that has been waiting at the intersection starts ahead with a constant accelerah 4a(dv ti iatj9*ki/*tion 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 123ypd;4t 0 cwpx m/s on the surface of planet X where the acceleration due to gravit4; 3 dywx0pcpty 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 plane xdw :2h- -nui:dnbp9jt X where the acceleration due:djwnh--9xiup : n2d b 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 plane0,:)+19ic blb,o xdfo*k fkz ui;ham5kof 8mqt X where the acceleratz5lof)ak,m k,bbo:f;iu*8x+0 c imfqh 9d o1k ion 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 wia.0 x so) d1go2z *axj5afd/pbm6j 6;t 5eucjmth a speed of 14 m/s on the surface of planet X where the acceleration due to gravity 5j* zdocxj ) g66 2am/5bju1s0t;e xafop. admis $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater thadt mjxk0 2-x6mn 0.10 s. If your friend holds a ruler between your fingers and releasdm-kjxm0x6 t2 es 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 3z8,+u*5fovlhk dv ga 19.6 m/s. What is its velocity after 3.00 s? lgo k+v*8dvh5a z,f3u

  A bullet shot straight up returns to its starting point in 9 s. ehhbks1p/ t+*yc8 uo*ud;no 5What is the initial speed of the bu;8o*t* ch5 +hk1duno / sypubellet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take t)qee;)pd )dtsrc4d)p4v h, zfo return to its starting rpd4))))t,; dsdp4v hqc eezf point?

  A ball is thrown downward from the top of a building withw ccadzu93- en0hkocc p5).w) an initial speed of 26 m/s. Itnccud5 e).39wp oac zc-)0khw strikes the ground after 1.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numer l qz/8elo;xi2ical value in 28lziexl ;o/qthe 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 air with /8t;a ew bvvi7a speed of 49.0 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 2 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 :cf7kz bg8a9ruqx6x p/zf7l 4velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = z/i nf2 hfn5c*2.5 s?

  In Fig. below, what is the velocc, srxd, :-q c9dr ai0fuvoc/ xa;pg3)ity at t = 4.0 s?

  In Fig. below, what is the vncs d6mq 68j w2mj)6oer:rdzn i;c/ w8elocity at t = 5.5 s?

  In Fig. below, what is the ave 1v7jz-sndzow9t b 6n*rage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity jqeymr( 44v:y from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1lslyuuh;:utd d 8+ (f7.0 s?

  In Fig. below, what is the acceleration at lnpkok;g8l5nel35cz 249 t (yuq kng,3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0t1zdk7js1ta-l0q w wq es rlc2x9/z7y: bt++b s?

  In Fig. below, what is the average acci f7 i*x*m j17wkp3zjxeleration from 0 to 8.0 s?

  In Fig. below, what is the evdcr u/l1si5zmvy9 6f*/ r(tdisplacement from 0 to 8.0 s?

Does a car speedometer measure speed, veln2(iuqko 0u: kh2qm9aocity? {speed|velocity}

  An object can have a varying speed if its v rx3;i2wx,hi. dk e*crelocity is constant.

  The velocity of an object can be negative when its acceleratiy:, gccce,devpl87k; on is positive.

  If one object has a greater speed than a second object, the i i oj8g4qk,n4wc ;:kgfirst must have a greater acceleratioj4iki 4kgwq 8n;:og,cn.

  Two cars emerge side by side from a tunnel. Car A is travel(,yzo khp+r3s ing 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 increa o0yzil 0gu.t:a oi,.csing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the baexcf0/ z0 lj9jn2jhp6t witl j9 jjehp00cnz fx26/h 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 ob.0t gd6jds)c 3qf*c8mcxy wj1ject speeds up, what is happening to its acceleration, how does it change if air friction 68m dccfd01 c*y.3 jjwgtq)sx is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, h6npn)ff +z) vfnb p3.jow+ )j) np3bnzp.n vf6ff does it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original pos:uj rmsqkb1 qnt+go5.lj:du1 uh**5dition with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this .1 5 bmu:uqqst:+j hkudrd**1 n5jogl result be altered?

  An object can have zero velocity and nonzero acceleration at the same t2fd5 kd8h)nxoime.

  An object can have nonzero veloc+ ydb1c t;kk/wity and zero acceleration at the same time.

  An elevator moving from taga,eaod1n6( swx8ea- uvr :/q5sk .yhe second floor to the fifth floor making no stops along the way has zero ac:asga-nw q uyoa, sk./(861x5ee d varceleration all the time.

  A rolling ball movesy*xbzo kci 6 )vky//7f from $x_1=2.3 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.1 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete la-;xpb*ddob0f dd 4tljcv7q-2 ps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer i fox1)lt )34 fdjc-xntn a straight line, moving 108 m away in 9.9 s. It then turns abruptly and gallops halfway back ixt xod )3fftcl-4 n1j)n 4.6 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 fror itye.ihhg5592qq8x4khv2 p l,/r lfm $10 \; m/s$ to $23 \; m/s$ in 4.3 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 fro5 u,w9e9k jd,5s;nohd9jxi12d: xc0ziiwv ylm $20 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rea . tiausbi;g:;ch a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially todrx (av r7*34 7ev ij7z 5/5jzvlkshtop speed aboutk *rzeoz3jj 7d5s5r /t(vv4h7aiv xl7 $10.8 \; m/s$ in the first 11.3 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 sp b); t,mwbwc9eeed of $16 \; m/s$ to rest in 4.74 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m l crnl 3ghu dw:t on(pb iilx)3l()3b62ong on the highway. Assuming a deceledp)r(b2tn )x i wl3ugh ln(b: 63ci3loration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck ;.afyt9o0o b8zo)z x+odxk .cgoing $25 \; m/s$ 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).    $m$