Suppose that an object travels from one point in space to another.8 357*gifnqs c fy,cus Make a comparison between the displacement and the distanc3*5c,iu gq sc7y nffs8e traveled.

  When is the average velocity of an object equal to the instantaneous velocits0p) k7) kh 7keiwnkmut*y 0y9/rbt*oy?

  A new car manufacturer advertises that ng, f7ufo,-v2v.qgn mw1dni2 their car can go "from zero to sixty in 8 s,g,q. g2vffno7w -uiv dnnm12". This is a description of

  An object moving in the +x axis experiences an aodlzpkk u50t )roz, .g:vv36acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow downdkk2z3eec n6c9/y j87 cy v3dd as it approaches a traffic light. Make a statemene y vczyej869k7 nk/3cc 3d2ddt concerning its acceleration.

  Suppose that a car traveling to the West (-x direct p w.c8 mf9by:4)bm1 ugb5hbjnion) begins to slow down as it approaches a traffic light. Ma1 b5cfbnj4wp b9y) b8um.h:gmke a statement concerning its acceleration.

  Suppose that an object is moving witc- t.i-xgj6x:e.gds yu9aesf*d 9p0y h a constant velocity. Make a statement concerning its acceleratid0 i9e.xstu edpcj6 s-:f x*-ayg9gy .on.

  If the velocity of an object is zero, does it mean that the acceleration is z52w)6kqp wc j0uq5wwy ero? Support your wjq2ky 5u 0q5wwc6 )pwanswer with an example.

  Can an object's velocity change direction when io 5kfw+x1mx a, v;9e/ro7gkumts acceleration is constant? Support your answer with an 7f/oa+ommg9r ;xk 5e1vx ,k wuexample.

  Suppose that an object is moving wiq q4d:tnym38txk8 f) oth constant acceleration. Make a statement concerning its motion with respect to odtq qntf8my83: 4k)xtime.

  Can an object have increasing speed while its acceil+mbd9r4g:7vl 1gf zleration is decreasing? Support g9 :1fd4bvz7mlig+rlyour answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Make:unbkov7 m)wb m 0(/vo om0nuo vkb(mwv7/:b) a statement concerning its acceleration.

  Under what condition is average ve vo*r*eas 6es3locity equal to the average of the object's initial and final velocea3* v6 rs*eosity?

  Objects A and B both start at rest)gly +;5z npsu 9x elyz-2hn5i. They both accelerate at the same rate. However, object A accelerates for np5il9xl;e+ygzzn- s2uy) h 5twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B bothnu(xk yo(6; c,nn whfb /d,g1w start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as obje;6fwknnc,ghd y o1u(x/b wn(,ct 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 frictiv/2elpf2q k2sj o..gm+y kqz, on, which of the following is true concerning kv, s2ejm/ olpf2 .qz.yq2+ kgits motion?

  When an object is released from rest and falls in the absence of fx;asj;w pbu70n mj5u;qr 5/piriction, which of the following is true concerning its mot;s;/pj0m 5axu5;rqw uj nipb7 ion?

  Suppose a ball is thrown straik zalehry 5o.p;vocj;68 bjz)e.. tx:ght up. Make a statement about the velocity and th .vo:hkt;x.z )j85y ejo ;lpazc.be6re acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straigrh25: vt i wo/2uq:wwhht up. What is its acceleration just before it reartw2ow:v52wq u hih /:ches its highest point?

  Suppose a ball is thrown st *;ovj4tjj2u u twoft.l 5cv*s h4-k6traight up, reaches a maximum height, then falls to its initial height. Make a statement about the*o- uto c j6lt4v ;52t.wjtf4vu kjsh* direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximqo b+z4)dd o0 (z1nwnp;jc/ wwum height, then falls to its initial height. Make a statement about the direction of the velocity and accel(nd cbz +wjw4wqp0no/ ;o1d z)eration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of ai1 n-yolpctj4v: /l2nc r resistance. Make a statement concerning its accelera2tj4n1/:y l o- nclcvption.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerationj0*q,c 8qamxbg ;ff9k when x baf*m 9,q8kcgq0;jfshe she reaches terminal velocity?

  A ball is thrown vertically upwafu)hb avbo3j w)c r92*rd with a speed v. An identical second ball is thrown upwb*)u9rv3 a focj2hb)ward 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 second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball d(t6b- aybc,n dk3)v uB is dropped from the same 6dk,3(bn-byvatd cu )building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B isy lee9 *)g.pqy dropped from the same building. As time progresy p .)lqee*9gyses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, axd 4w1 yls1n1bi.dv.c nd the other is thrown down, both with the same initial speed. What are theiycv1x. dd4w i1b1sl .nr speeds when they hit the street?

  A brick is dropped from the top of a building. A second bt8; xi.w:b vate3f1x erick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of ; 1i3:b veexttwa 8.fxthe two bricks.

  An object is moving with constant non-zero velocity iycw7bxxa 1)bj;qo:4n n the +x axis. The position versus tb:1x;7o 4n)awxyb j cqime graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Thsz7b- ie a1 vt8emlu5)e positi5e ul- 8vz 1bi7)smtaeon versus time graph of this object is

  An object is moving with constanpc.cfb;o+ 2lez02 hpu t non-zero velocity in the +x axis. The velocity versus time graph of this ofpb+pchzl 2;. 0u2 ceobject is

  An object is moving with constant non-zero acce)ibtw2/7+w ze zfkca 5xse -t/leration in the +x axis. The velocity versus time graph of this + baeixe5 2z fct/w-w/ztk7s)object is

  The slope of a position versus time graph gi+ ytwds+:f+upb 9sax: ves

  The slope of a velocity w0 85hp r:j(m8c1bil 6piudrgversus time graph gives

  The area under a curve in an acceleration 6kf5e f60fjnm.i0ijg.k r +lhwo(9gdrrd 4o 5versus time graph gives

  The area under a curve in a velocity versus time graph gives (1r;2*y pfzva;ybkps

  If the position versus time graph of an object is a ho1ipglyo//k5 v rizontal line, the object i/5/kpvg lyo1is

  If the position versusg*.:jgqh/o lq:ib m6x time graph of an object is a vertical line, the object isqbj 6hlx g/q:.gimo :*

  If the velocity versus time graph of an object is a h69udqc n4wzpg:b1o v ) mqqw68orizontal line, the object ipo4cmq w:686)gvudnb9 qw q1zs

  If the velocity versus time graph of opkve y i,m;s/h.9nj )an object is a straight line making an angle of 30 degrees withmk;/, .9jn p)eoshv yi the time axis, the object is

  An object moves 15.0 m north and then 11.0 6 y+lmpp) sfl8fo/of6 m south. Find both the distance traveled and the magnitude of the displacement vecto8mf sflp)o+ fy l/6o6pr.

  A boat can move at 30 km/h in still water. How long will it take to momm dx;0u 4v)dqve 12 km upstream u mmvdd 4q;)x0in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mpg 07 cz-az2rqi = 1609 m)

  What must be your average sedvfx+xsw9 +g8voj:8peed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximatwg3:5 xbupd6p ely 42.0 km) in 2 hours and 57 min. What is the average speed of the rpw:gdxbp5 6u3 unner in m/s?

  A car travels 90 km/h. How long does it take fwzb(w(7li+npg0 ki 6v or it to travel 400 km?

  A ly (light year) is the distance that light travels in o.e/x gy xp/7dgeu1/xl ne year. The speed of lig / 1ypdelxu/e/gxx7.g ht 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 tuamn j86sxm7 3he side for 4.0 s, how far do you travel durin3mm6x 8sja un7g this inattentive period?

  If you run a complete loop around an outdoyt29fl g . 2rbtzyr)/fuw+w0eor track (400 m), in 100 s, your average velocity g 0f er rl2.w/)t+wufy2z9tb yis

  A polar bear starts at the North Pole. It travels 1.0 km south, thnhh z*;o2l hho1fd7, qen 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 th fo;h2ozh1*lh,n d 7qhe bear's average speed?

  A polar bear starts v (br)*2ufi sdat the North 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 tris(rd) bi fv*u2p takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from schhoa cy79x/+(hra5t*hb2 f,iqhu rex 4ool at 55 mi/h for 110 miles. It then starts to snow and you slow th/h9abt(h*, rxur ea7co4+ yix 5fh2qo 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. Whycd1 -qb.9njc9mm 2k bat is the averagk2nd9bc.q9mjc b -m1y e speed of the motorist for this trip?

  A motorist travels for ar4xy ;n7*xnx2ip qs( 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average spee ;(insp2*7 4r qnxxaxyd for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north 6) u5wukhrmv)for 750 miles. Wh5)k uu6)rvhw mat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) f xww qp w.f ln4c2v48 m n*u7p8rv3txfa+ih8;nor 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 4pncx42ihf7fwvwt8a p 3 nv r8. wun;x+*ml8qthat the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop acoxz invs.6tzqbv5,, 8jfrv)s 9dcob+4/0 zi fter 10 s. The car's average velocity during deceleration was 55 km/h. What was the car's deceleration while slowing downdxi,t0v6.zz sz +i8,b ) 4q5c/o jocnrbsv9fv?

  An airplane increases its speed from 100 m/s to 160 m/s, bb7ela-w krk,tvv2 5. at the average rate of vbe5kla,-7 k2tv brw.$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rexxmc-iw -bce /:2/8pv6m haiate 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 accelerates aitf9fh:ktn,t0 mp .e;t $4.0 \; m/s^2$ 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 speeds up with a cons pjnra22 xb,heg.u( 2ptant acceleration2(hbn, gp2xp.uear2 j 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 5.3 m/s experiences agpl0 ;;nu4pny1/m0e fv( 4nawd ;uh pk constant acceleration okp;v/1uae0 ; hnm04gdn (pnpu 4 fyw;lf $2.6 \; m/s^2$. What is the cart's displacement during the first 5.2 s of its motion?

  A bullet moving horizonj :p ky t)oc+2oug73kltally to the right (+x direction) with a speed of 538 m/s strikes a sandbag and penetrates a distance of 62.65 cm. What is the ave) jou:3pyo7 tkcl2+ kgrage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrin.bqaf w;w q-99i.j 7 evk1ycaer. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is consta-yqawwf7k 9qjcvni ;.e9.b 1ant, what is the length of the catapult?

  A car starting from rest moves with constant aqecyrr +yt3 o d-u2/r+gi.zp 3cceleration 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. Wh95eyvrrvjz5 2 6xruv/ at is its average accelerati2 5vryvjzve /xru r596on?

  An object starts from rest and undergoes uniform acceleration. -;arilgp19eeti+7lxm bs: 0j During the first second it travels 9.2 m. How far will it travel during t xi +tm9egj-eprsl7i b0;a :1lhe third second?

  An object is moving in a straight line with constant accelerct bdv dv.hh+j21db +gk 1a7;eation. Initially it is traveling at 16 m/s. Three h 1deda;cb+k1.db 72 gj+vhtvseconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly 9vg)md1e4t (pvh h1lxat $3.0 \; m/s^2$. 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 decvrdbhzr (p80z* u;pi ;i2x g-melerate 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 w;y 3msgq1ck w j.kd//aaiting at the intersection starts 3mwsa qkkjc1g/dy/. ;ahead 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 upwardxv+w *doohqmj g) 75c+ with a speed of 12 m/s on the surface of planet X where the acceleration due 5*7hg+q o+jxdm)vocw to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown u:q2pn(xv/qw/- mdi df p 4cx-vpward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 4-dipx d2/c-q vqf:vnp(x m/w$1.5 \; m/s^2$. 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 sur4gstn cf/ bl9np* kc20face of planet X where the acceleration due to gravitbc94*pn2/ fgcs knl 0ty 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 planet X wk-rhobw4o8 y ): motmv /h uw+n/am/4bhere the acce4kam v/u h//w) obyrnmto8-+4ohw:mb leration 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 04, + jnpfxkwxeny(.uthan 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far.ju fe + xny4p(knw0x, can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a)nhml: .buz :f velocity of 19.6 m/s. What is its velocity after 3.bf.n::z m)l uh00 s?

  A bullet shot straight up reg *f8 p-hgmnrh 0e3r)eturns to its starting point in 17 s. What is the initial speed of themn)he*r0 prh egfg8- 3 bullet?

  A ball is thrown straighhjqy16 uf ksl;*jj+ e/hq3ec 4t up with a speed of 36.0 m/s. How long does it take to return to its starting 43uqe j 1ljhy f6 /*e;sj+hqkcpoint?

  A ball is thrown downward from the tpl)yfb dr /u4spt3fet 6 n,8ln 0e4-ohop of a building with an initial speed of 24 m/s. It strike/yl fo dulnt60e4ts), -eh4br p3fn8p s the ground after 4.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nj*con9 ifm-oud ; ,5 ollm,qd0ho9;g zumerical value in the blank c* d5z;omfgd ,qnoi0j9,l9m-ou hol;s)
(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 o+zn a vnmjghuh0/n qf18 e;0q;f 32.8 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what n5ue g3tshd37is the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t bk lm.e1u tp a-6,5k3qsld4) b: asguy= 2.5 s?

  In Fig. below, what is the velocity at t -1rx (xsg1xnt = 4.0 s?

  In Fig. below, what is the veloh.:r p,dozot7city at t = 5.5 s?

  In Fig. below, what is the average velocity fromxp.ar9oef +yx + kk,q* 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0.lzej.7ww7dn/lmk 7qyknj,7 s - a9x u s?

  In Fig. below, what is the acc,1mbzxv: s1 qf1+afcb eleration at 1.0 s?

  In Fig. below, what is the acceleration at4m ,mz fu1v2nj 3.0 s?

  In Fig. below, what is the average acc 6x,cwe 6 r;u,0qyhouseleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.q zoi-tof e1o)cd9a3,8t2h zy 0 s?

  In Fig. below, what is thxvb 8o.p aec3.e displacement from 0 to 8.0 s?

Does a car speedometer measure speed, v7;gt5ojyuu:a q/q 0m lelocity? {speed|velocity}

  An object can have a varying speed if its velocprq2iw* w 4j:city is constant.

  The velocity of an object can be negative when its acceleration is p m*.cz 7hbdxt4t5)bwuositive.

  If one object has a grmhsb hq wmb)42z* db.:eater speed than a second object, the first must have a gr4q).bmdm h ws z*2hbb:eater acceleration.

  Two cars emerge side by side from a tunnel. Car A is travelinga xkapa4c0,fls)/ o+oiv8; pz 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 spet-x e sl,9 mm*lbrbm7 .rj8*wmed as its acceleration decreases.

  A baseball player hits a foul bu y y75u027saivjv 9a +ru(q;kvrwzk;all straight up into the air. It leaves the bat witi;k ksra7qr;0way 5+vvju zuy(79vu 2 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 object speeds up, what is happening to its accelerxjonq(i/+a 6yv , /hntation, how does it change if air friction is i/q t,ovnnj iyh (a+6x/gnored?

  As a freely falling object speeds up, what is happening to its acchxd2bc3s-dlc p+ onz u16 ,w:xeleration, how does it change if air friction Clx -d,b362whsz:n1 dc+ocxp uAN NOT be ignored?

  An object that is thrown vertically upward will return to its originam)2;wm4 +e 3mz (tilehu gpue7l position with the same speed as it had initially if air resistance is nti;el+ 23w m4z uugmpem(7eh)egligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero veloci*i hrxsl5ng z6 toou( a 8185aggck1s0ty and nonzero acceleration at the same time.

  An object can have nonzero velocity and zewrapoq6pr, ,mt/m 2+k ro acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops vr2jj, gdbuf 8u,z3hn11z ra3along the way has zero acceleration all the time.arnjvz1 8 fz2u,j13,bdr g3uh

  A rolling ball moves from(jp(aggafh /dr r9l-: l16xle $x_1=3.3 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.6 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ 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 yn4 wl6g8vxvbr(f f 67p0, faccomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.4 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 a straight line, moving 101 m away 1wbohh ovi1tw)p cp,;uda 8(+ in 11.2 s. It then turns abruptly and galo,t1oa (ihud+cv pw1w)bh p;8lops 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 fromk otoj/w rajnawb;;8:+v: x;r f8d1cf $10 \; m/s$ to $24 \; m/s$ in 5.3 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 from4z8jehsc-bi/ r8q7 qx0pot :d $21 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reatcmou n:v,jk530x. +n w)ezzz ch a speed of $26 \; m/s$ 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 out of the bllz*bipy*j6 w3eh4 qo e:l lv;9ocks to essentially top speed about4: 6l; * 9o3zwlelpjbiyqe*vh $10.6 \; m/s$ 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 uniformlymv-zkyr0s jc ,3/m1ij from a speed of $18 \; m/s$ to rest in 4.01 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves 8trbnua7a/ yc v w49c a3zjp4w*zw:,sskid marks 92 m long on the highway. Assuming a deceler9w b4j3zvwun saa /: cpcwt 8*ya4z7r,ation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going /:epz qu,l,rw$25 \; m/s$ 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).    $m$