Suppose that an object travucsj 1o(o;1a 2i rvz,eels from one point in space to another. Make a comparison between the displacement and the distancero(cve1aj zui 12; os, traveled.

  When is the average velocity of an object equal to thcmbfdw 353f/w1 b7 oabrw59 qye instantaneous velocity?

  A new car manufacturer advertises that their ca 7 ebzlv8zms+1r can go "from zero to sixty in 8 s". This is a descript 1mbz+ 7vl8sezion of

  An object moving in thev3-4 1vvq 1r5rjj6gouo 9kf(nwqp f)u +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directionex* 9t p+af0oh gf4:qm) begins to slow down as it approaches a traffic light. Make a stateafop *+:t904mhgqxf ement concerning its acceleration.

  Suppose that a car traveling to the West (-x d+i)jp51b byev5n 5cq5g0zj 4a boxq8oirection) begins to slow down as it approaches a traffic light. Make a stateme5zco 10jq +b eqb5ny5i8pbv)o 5ax4jgnt concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemeu e;dixy4j9 ooikofbd.5 :/*unt concerning itd*kbxo ii5o94df. ;eujy o:/us acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is ze: e:k3 2w4mzafd7 t/mbuk-woqroo/23b qk a zdtw:kmeum7: f-4w? Support your answer with an example.

  Can an object's velocity change di/ h9m3 v2bcohdrection when its acceleration is constant? Support y2 bm9vh 3c/dhoour answer with an example.

  Suppose that an object is moving with constant accey jn:3p 6syppfsyq5ob+k/sq y v2* d8)leration. Make a statement concerning its3s 6b2d+jfqy/y)8 y:vsnpkp*qpo5 s y motion with respect to time.

  Can an object have increasing speed qcqtdwq0lbv qtz ln7(j68 4 9).paji*while its acceleration is decreasing? Support your answen j6 plqq.q4 07c)titl va8b zw(j9q*dr with an example.

  Suppose a can, after angr. t06n8kgu qizod6bc)y 3d 6 initial kick, moves up along a smooth hill of ice. Make a statement concdzq8b0nc u6t.oigry3d k66)g erning its acceleration.

  Under what condition is average velocity 0kzcrehr8m/n f-gz 60 equal to the average of the object's initialgh zf 8cz0/mn06krer- and final velocity?

  Objects A and B both st iu9tc3na. ) xu1fy8aeart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as aex9 1 uuc.8ait) n3fyobject 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 they9d0ykkgei8n: ir9 ,z same rate. However, object A accelerates for twice iy0ei9dzykr9,:8 nk g 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 in5pavwglx q96 ,ewj9+q the absence of friction, which of the follol9,9ax6w5w gqpv +j qewing is true concerning its motion?

  When an object is releasedh9a .1apgfv(h from rest and falls in the absence of friction, which of the folg9 afhh(p.a1v lowing is true concerning its motion?

  Suppose a ball is thrown straight up. q(3vwhg 9mb p zzxqy:0-e7p:1gsu8 ph 7i1imxMake a statement about the velocity and the acceleration when the b 0upxqsi b(-pz gzhp71qy8 931xegmm:hvw :i7all reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before+3-dtsn i, oi4ll;vko it reaches its highest k+;d sinvl o-34,tiolpoint?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls74rvc0kc p2rfh7oxr 8 to it784crfv x or07h2 pcrks initial height. Make 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, then fax2hb,uh2mmda : ,*zh x)urueu j ;1kiz;-.wlwlls to its initial height. Make a statement about tui2:uxba.;jum; zrwhhzm dh*2,u1 ek-)wlx ,he direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. M-x i, zoy7y .skix*86bxjt;pc ake a statement concerning its acceleratio pjx;yx,6y z*t -xbi7c.o8iks n.

  Suppose a skydiver jumps from a high-flying plh,sqa+n9 lg k:ane. What is her acceleration when she shkl,s9 nhg+:qa e reaches terminal velocity?

  A ball is thrown verp 9s9 fnebb )wpi1/ra+p;za6ctically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What zpr1+wspb ; f a6 )aeib9/ncp9is 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, balmn fdj 9+d:ux 4rjlb17l B is dropped from the same building. As time progresses, the distance betwefl+jd1xnd7 rub : j49men them

  Ball A is dropped from the top of a building. One secon*o5x*hdffw e z, 3q ;9/k : 5+ooldh3gqevptlud later, ball B is dropped from the same building. Ao 33qt:zo fkdeql h,lu+w5ve9dfxh g5/*o *p;s time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up agxe6v0*ipdt3j,( j ys u*/kv 6smk7o, and the other is thrown down, botism7kv /0t vx( kjsj*3euyo*,g p d6a6h 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 thrown 2b sj2i 3o1b t0sau5iistraight down from the same building. They are released at the same time. Neglect air resistance. Compbsau3 i5iot0sj1i2b 2 are the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positm7 n gm7*aw(wmzcu,9tion versus time graph of this t(mnz*aw uwc9m77m, gobject is

  An object is moving with constant non-zero acceleration iaj+ hw:uyx4xi 3 38zann the +x axis. The position versus time graph oyhw u8+3: nxjzx34i aaf this object is

  An object is moving with constant non-z-9ivi fa/w,b) nw/v diero velocity in the +x axis. The velocity versus time graph of this objec fadw),/v/ i9- wvnbiit is

  An object is moving with constant non-zero accelerationb pw 25sxnd81 .um/4.rrohcvj in the +x axis. The velocity vej5b2 d1w4 nvxp.ro .ms ch8/rursus time graph of this object is

  The slope of a position versus time grap e3qs-vb nu3ydl,8pn3 h gives

  The slope of a velocity versus time graph gijw1rbb .cx),v ves

  The area under a curve in h *ie7 g1(mj 0te)lu2oa71 gip,t bhnkan acceleration versus time graph gives

  The area under a curve in a velocity versus time graph +q6s-cl/bmlxz(-2rk j7zi sc5 k yed-gives

  If the position versus time graph of an object is a h71 rxz* h.qe,ego1au zorizontal line, the object 7hz. qrug oz,axe*1e1is

  If the position versus time graph of an objezutqw9ov3ramv5- q 99ct is a vertical line, the object isa zqo9-5mu vt3qv 99rw

  If the velocity versus time graph of an object is a horizontal line,oyi *tsse/66a+7y*k)w zeqg a the object issi+g*a *qz6e7ea6sw yo/ kt)y

  If the velocity versus time graph of an object is a straight line making an anxgt ej326k+l ngle of 30 degrees with the time6x+ng3jt el 2k axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the d:.*usl,cwbp;+b j4h tzcyn 1 tistance traveled ant+ybw h ;tu ,c1lnsp4cj.: bz*d the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How wmdn2;( wgdy4tz( h(qlong will it take to move 12 km upstream in a river flowing 6.0 km/hdwm t(g;n(zhw2 (qdy4 ?

  55 mi/h is how many m/s? (1 mi = 16090;u .o)do7xelztwc 2n m)

  What must be your average speed in order to travel 35k8yag 18,upp0slriijywo9 8 80 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whatqb m-8 af3u4hpfy) yk z7n*h3r is the averag*af)um p yryz4 3h73fqh-kb 8ne speed of the runner in m/s?

  A car travels 90 km/h. How long doesx-*p bka, ogyc0y+ eh5 it take for it to travel 400 km?

  A ly (light year) is d n jo-j9h.ak )/ks/nathe distance that light travels in one year. The speed of l-). dnnj koh/k 9ja/asight 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 side for4)m clialhr*xm +5v,y 4.0 s, how far do you travel during this rma5mh*,ic + v) xyl4linattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, ya/ 6*usf ;bbah)vu/x1xlxpv. our average f ;b.*v1hup l/6xuaxb)x/vas velocity is

  A polar bear starts at the North Pole. It mez2l ppa4-:d travels 1.0 km south, then 1.0 km easmd2ppe: a4z l-t, 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 average speed?

  A polar bear starts at the North Pole. It travels 1.0 km 47b92s oed7ehj ))rsm6xlffj south, then 1.0 km east, then 1.0 km north, then 1.0 ke ))e2bs7 dj 9s4 rox6fhjlf7mm west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weeaa-y,zv*/k6g g.iqt o kend from school at 55 mi/h for 110 miles. It then starts to si-,g ty.aaz6/qo * kvgnow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Whav0efut;:/ u fct is the average speed of the motorisff :/v0cut;u et for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her aver.3)r-k7j jbdiksfza*5 vt u)tage speed fu kbfdj7itjt)53ka. rv*)z-s or the trip?

  An airplane travels at 300 mi/h south for 2.00 h a s)cos o9:3,nbtj )csund then at 250 mi/h north for 750 miles. What is the average speed for the tr,3ntsj o s:u)s9bo)c cip?

  In a 400-m relay race the anchorman (t e.1kw elp:wz1r9t*)n*ok59n rgtaxmhe person 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 team B runner can have when the team A runner starts the final leg of the race, in order that the teamkrzgm 1*w9).k1po:wn 5x9 lntta*re e A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 8 s.)f/av0wjl/ fl The car's average velocity during l/ff j /)0lawvdeceleration was 38 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average ra b)q3u9tuxuaxn;, r 0wte of nw, ruuxq;9u0b3xt)a $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of ub, :c ,y.bs;wpfi ki;$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest a jaq9acs 5x,u siu/x)*nd 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 speein8p;d r)r7o n 7ctjo+ju0b- hds up with a constant acceleration j0+-d )cr7ru; o bhn7t8oinpj 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 1u-08vh 8p bu :itz ,-le,mk)auqz0adi.2 m/s experiences a constant acceleration oft0:hkplzue 8,u vza8 iq ,0da bmu)i-- $3.7 \; m/s^2$. What is the cart's displacement during the first 6.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spep h* vods0w5ce, ;ti/sg5:st* (tdzbled of 298 m/s strikes a sandbag and penetrates a distance of 61.12 cm. What is the average acceleratz5iglsw*t c* 0t (;et:sb/5v,d sphod ion, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircrasc632yw,j 8arvbe9x 4vf)xssft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requiresb x3v8, escw fjy 6)4as9sxrv2 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with ck 1o/.3qxdqvd)-k vejonstant 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 its avera1zap+)nc wb 2zge ac apn1zw2+ zcb)celeration?

  An object starts from rest andl0 nvyqdz8,as70/sl*bw sz2j undergoes uniform acceleration. During the first second it travels 1.1 m. How far will v8n w 0*z bdy7,qjs0ss/za ll2it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initiall6nhhw1 kl1 :. oxgr,nfy it is traveling at 16h1g1,o:6 xhr.kl nwfn m/s. 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 unifoy +g a73enw5 gy-g*afubfca .)rmly 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 o5.dp4nhgc(u.tlx: qg n 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 thatsfd 1 m9/l- dmn8e.xmr has been waiting at the intersection starts ahead with a constant accefr.e9 dx-ms8mm dl1/nleration 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 -q/ms0)h6.cakqoic6 n 1qfi1wy5q xo 12 m/s on the surface of planet X where the acceleration due to m605w y sqh1fqx.knoc-)qi c1iq a6/ogravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a n5 2hn/pym0c; f y5swfspeed of 12 m/s on the surface of planet X where the acceleration due 5nw5fpc / n20;ysh myfto 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 s -j6rgec/x tg)urface of planet X where thgxertj6 /)-c ge acceleration 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 surface of planet04xbdoinoy ,6l aumtv6cq+ 90 X where the acceleration due to grao0no0qbctmu,6vy9d 4l+ i 6xavity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is ukkk5(mkl bu 16sually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can1kk(k6 lmu5k b 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 its velocityoh24n ,ghj0/ifsrjv,qvi r -3 after 3.00 s?h/-v r 3f,hgqi v0sij4j2r, on

  A bullet shot straight up returns to its starting point in 6 s. What is the i 8hb gb:dk+ri0/aa 0fhnitial speed of the bull /dfbkgair 0hab :+80het?

  A ball is thrown straight up with a speed of 36.0 m/li56.w me ff;js. How long does it take to return to .;e6 5w mffjilits starting point?

  A ball is thrown downward from the top of a building with an initial speed of 29 c ld(ma9p :1hqifcz+9 m/s. It strikes the ground after 3.0 s. How high is tc:m 1p l(ac+zid9fh 9qhe building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeriqvr g/r21z2 tycal value in ther/ vqyz1trg22 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 a speed of 42.5 m/sa)24zy .1,y mqqqe jhm 7 frlb7z0:oc+il(niq. (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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what q nwa0-bue9 p:(na. sjis the velocity at t = 1.0 s?

  In Fig. below, what is the velocity hik*jb )6ew,z at t = 2.5 s?

  In Fig. below, what is the veloc flz tbw.9zo7y*4zq( floa9k.ity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s?h pi 3 l3ipbd8:jj2wk;yi 0at,8z/ fvg1b-s tm

  In Fig. below, what is the ave4 veh 0pftxyg9i- q*6erage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity */2 wt) unjlfl46onzi from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s3:mb ;n s3slp:hgpazyq/aa:/?

  In Fig. below, what is the acceleration2+mp+/ wnel7 tf1k lnv at 3.0 s?

  In Fig. below, what is the ave8y4flb3zl;/qr ipukr6 tv +1 qrage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelerate+ )yr,ho9kakg 1 k6uwvk(- kaion from 0 to 8.0 s?

  In Fig. below, what is the dis1jsbz1*5n l ix2-ssh +u(vtpfp7 t(d xplacement from 0 to 8.0 s?

Does a car speedometer measure3 zws3cegf 4.; wxcbrg 9y0r;a speed, velocity? {speed|velocity}

  An object can have a varying speedt4.xy v;2h 6zc1jp;oh.txvgq if its velocity is constant.

  The velocity of an object can be negative whnne2* 4f kr.pien its acceleration is positive.

  If one object has a greater speed thg)b6blddiusw+ntb-/ q,6gt ( an a second object, the first must have a gr )bwn/tgtu(,q ib+d-6ls6gdb eater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling e qh/oewec:ii9+/n( iwith 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 accelerqz o 6 lebgxf7 g:usrz1.k+8.zation decreases.

  A baseball player hits a foul ball straight up into the air. k1 drrq 4;a haujw)+l+It leaves the bat with ;+ a+rkl) jud haq14rwa 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 hap2j6xc/rgy+3eo d4 yelm:cz 0 qpening to its acceleration, how does it change if air frictione cr0:e+3j426y omx/ zld cqgy is ignored?

  As a freely falling object speeds up, what is h lkp4g2o6un8eappening to its acceleration, how does it change if air friction CAN N8 kl2u6e pg4onOT be ignored?

  An object that is thrown vertically upward will return to it;5y( su wzca(fzbz7w5 s original position with the same speed 7cw 5bz ysua(f(;w5zzas it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have z5(e9hz tgh :kdza5xth2 p 0j.iero velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same time.l+f5spo y. ; v z;e0jkyy 0d.saxr(r+r

  An elevator moving from the second floor to the fifth fl t3o5 fp/ukp.f:rz*tsping*61h f r 9door making no stops along the way has zero acceleration all the time.sr*.fp3p6kg1 pznf t u 5d:9ifr o*t/h

  A rolling ball moves fro5y8oi-3mlw u8qpby)fz4 8 fexm $x_1=2.8 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.9 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete (g h4/cq f3uxslaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.3 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 zcl3eu6bq,3a a straight line, moving 87 m away in 11.8 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its 6 ae3cl,zb 3uqaverage 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 frombc:9rl +md v sozas*32 $12 \; m/s$ 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 from w05pukhbdh f 0r;7a-m tjh9g -e3bmn8$22 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rexx g) i8sip*p p,dixvb58,e tya 10ar(ach a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst ougo5x7g2b zb6 kt of the blocks to essentially top speed about bgb 756 xogkz2$11.0 \; m/s$ in the first 14.7 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 unifoqgoeuc8 grb3.8,a u 2 z7fxno8rmly from a speed of $16 \; m/s$ to rest in 4.73 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m laf(:b fdtf5hwn;:7 qe ong on the highway. Assuming a deceleration o:( dnhfa:f e5t;bwfq 7f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goinghmqm (3 8bs3gg/8v nnl $25 \; m/s$ 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).    $m$