Suppose that an object travels from one point in space to another. y/j3avgul;tqh5b:,7 / z nmme Make a comparison betweenq5y bm//,tglj;hv3 :az7 enmu the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocityu5v/tou;i:afg4- j lv?

  A new car manufacturer advertises that their car can go "from zero to sixl2t4h6v3d dwvty in 8 s". This is a descriptivtld2 wd6v43hon of

  An object moving in the +x axis experien -sugp,ll nk(tz v* (e5wo5tg:ces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to thehxn; zn;8f (4 sj-l,uouz2j sj East (+x direction) begins to slow down as it approachel;4u8,-jh(j2fu ;s j szx onzns a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directio 6f(r3)db: w bgsx7,3hih 12im71yodtgh mt ion) begins to slow down as it approaches a traffic light. Make a statement con:twrd13 7h)byi 3s1h7fobg 6,tho(dix2m gim cerning its acceleration.

  Suppose that an object is moving with a constant velor+m.yy cnm9-febwx6v ,.o dn. city. Make a statement concerning its accelera .rnmd.-v9of6x+bm, y.necy w tion.

  If the velocity of an object is zero, does it mean avl0rz 97(iw+(zb dld that the acceleration is zero? Support your answer with ar dazb( 0+l (9iwz7dlvn example.

  Can an object's velocity change direction whentz b2xm;s9:h (t1/pgpikff 3p its acceleration is constant? Support your answer with k3:(tft9ip 12; p hpxbfgz/sman example.

  Suppose that an object is moving with constant acceleration. ;ga n,;8krszir2uc .t Make a statement concerning its motion with respect to t;uc.;8i krsnr2z at,g ime.

  Can an object have increasing speed while its accrq krho r25w89eleration is decreasing? Support your answr2 9 whro8qkr5er with an example.

  Suppose a can, after an a+m* g:h+t9 wwrei9 guinitial kick, moves up along a smooth hill of ice. Make a statement concern:r ea*+t+g ihmuw9g9 wing its acceleration.

  Under what condition is average velocity equal to the average of the objecthd utt;a/kr31 's initial and final velutt;a 13/kdrhocity?

  Objects A and B both start at rest. They both accelerate at the same )g)3 pr4epkn:m t9zmw rate. However34 tw m:9krz)gep)mnp, object A accelerates 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. They both accelerate at the same rate. Hz( 6qcmh7le8a l. ttd20p61lra/nziv m0e9dzowever, object A accelerates for twice the time as veq1c0d8ira.0pad(l n6llh6ttzmm z 7z92e/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 frictionj ; ngo0:mdj cnk3 zh-zvxi:-6, which of tjjd i ;-ckhzxn:6gvm:- z0 on3he following is true concerning its motion?

  When an object is released from rest anm;; 7mly5fy 1 m0lnwbyd falls in the absence of friction, which of the following is true comm ;ymyl0 f;7y5wl1nbncerning its motion?

  Suppose a ball is thrown straightv7+w l 5c8d7c e cq/aq)/osqor up. Make a statement about the velocity and the q qv7o+cw8do/ rsc / a7)e5lcqacceleration when the ball reaches the highest point.

  Suppose a ball is thrown straigw,+u-ubik - we/9ct1pyz+fbk ht up. What is its acceleration just before it reaches its + + --zbyk c/kit9,ewpu1bfuwhighest point?

  Suppose a ball is thrown97lgf0j+* 2w0lbze t4 knw efx straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity anz 7 2jn+f*ket 9wlbwg fx0le40d acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximusmzio63 4ft,hdogne (v(+hd4 .: y xjwm height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comi,e hoh z:xw63+4tion(djfs4vmyg(d. ng down.

  Suppose a ball is thrown downward in the absence of air resistan:2gy;xk/9az ( ygfpk fj1 kh*pce. Make a statement concerning its acceleratioyfgx; 1jf/2zgkk(h 9y papk*: n.

  Suppose a skydiver juh1r t.lpub0 o0mps from a high-flying plane. What is her acceleration when she she reaches terminal veloc00b hlop.u r1tity?

  A ball is thrown vertically upward with a speed v. An identicalqe 9z;- z h,ps;tk8byy 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 h,q-;bep zyt skh z8;9yigher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later,8eo 6dx9 5mt nxyi8h9g ball B is dropped from thexd58ehx689y9tmnogi same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, bal t (ozg,qpgr(6l B is dropped from the same building. As time progresses, the difference in their spotrgzg(q (,6p eeds

  Two objects are thrown from the top of a tall building. n4s6n v0:dh)rx hk (sp/ +xbkxoaz:r4 One is thrown up, and the other is thrown down, both with the oxvds :(kzxp/:b04hrns 4)6 arkxhn +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 isdsgbnq3 o-o8 d4ss:o8 thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the sbn:8s 4qdg-doo3so 8two bricks.

  An object is moving - u*tucjl2/ ykwith constant non-zero velocity in the +x axis. The position u2-yt kcluj/*versus time graph of this object is

  An object is moving with constant no9m 5zz67 (tz,b fwon)+2foi gicmq -mln-zero acceleration in the +x axis. The position versus time graph o9f) +gibw m zi c,mm6n (o5zq-lfz7t2of this object is

  An object is moving with constant non-zero velocity in the +x axis. The veloc(+s(cu(fs tx3yjrble3 k s4 b*ity b jc3kb(srs4(s( tyf*xu+e3lversus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The veln .sudt.hb.2u i o37spocity. .os h2uipb.u7d3ts n versus time graph of this object is

  The slope of a position versus time g,fgpyp5j c1g pd01*ga raph gives

  The slope of a veloci+wd +-aun kau7ty versus time graph gives

  The area under a curve in an accelpbm-kj 1o nx9;eration versus time graph gives

  The area under a curve in a velocity versus time graph gi, 5kud(pcv(ja q7d*tyves

  If the position versus time graph of an object is a horizo/x47t uue5q/r8o j3 wraz 4ycmntal line, the object y7tmrzjo eu35 4ra8xc qwu//4is

  If the position versus time graph of an objit iv+qft5xb+ 2je 4k i6:qvw1ect is a vertical line, the object isiq+wv it6t45ef+ k bx1: v2jiq

  If the velocity versus time graph of an object ia+xs9ign4;f eb( 9kyjs a horizontal line, the object iegbx fs ay(ij9+4n9;ks

  If the velocity versus time graph of an object is a straight line making.k indh l3p -d6u*pgp) an angle of n gd 3-d.6ukpipl)p*h30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trav,i6 qiqcnz m-9 5,jrcqeled and the magnitude of the displacement vectom,zqn- cic,56qjqr9 ir.

  A boat can move at 30 km/h in stil83q7uhfcf9(2bs,ysn2 ufbyal water. How long will it take to move 12 km upstream in a river flowing q s,c9bybay 7f(nuf8hus223f6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 160 za wu(tn(2p q1l+*; e/*ria hxlwnuh*9 m)

  What must be your average speed in order to travel 3/ej s h wmzzs.a:rh:(950 km in 5.15 h?

  A runner ran the marathon (approximate6icl4n4c7cu:lw r a:aly 42.0 km) in 2 hours and 57 min. What is the average speed of the runner inar: acn6ic74wu:cl4 l m/s?

  A car travels 90 km/h. H8mabdo3e::u,cyg h t5 : )qnhbow long does it take for it to travel 400 km?

  A ly (light year) is th1zw+ d)kpeff +e distance that light travels in one year. The speed of lighz +1ffpwe+ kd)t 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 straig:4ov-l7 7rs pt3fl ae6yhsz7ght road and you look to the side for 4.0 s, how far do you travel during th : lsfvzeat7 hy6g4 -rl77s3pois inattentive period?

  If you run a complete lociak.a (:7rk re: ac-. )leafd9 w4safop around an outdoor track (400 m), in 100 s, your average velocity aasc 7.4di:e9krre wfafl-k:(a)c a. is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 mz1vb0i0zqrp.e,q8l+ k h e/w km east, then 1.0 km north, then 1.0 km west to retu1zr0,eb 0+ kivh.wq8 qemz /plrn 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 south, then 1.0 +oav28- dmg1qj lee+3iu azw8 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takg+qad882+a13ie ozvm ue-wj les 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. vr 5f ky /x-byov.0 qlpa7:m1bIt then starts to snow and you slow to 35 mi/h. You arrive home after drivin m01 y7 y pv5lrvb-/:bfaxqo.kg 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 s,4my0ukk8 f7jazjvwgx 8 5f0 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip, 48w 8guyff kj5xzkmjv70s0a?

  A motorist travels for 3.0 h at 80 km/h 9f olbgyv5q*(and 2.0 h at 100 km/h. What is her average lofb*vy9gq (5 speed for the trip?

  An airplane travels at 300 mi/h south for 2pi,jix(xy-l 6.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the t lp,i6x- yxij(rip?

  In a 400-m relay race th5xvtlay- r*7,9 a-rvru* tlxxe anchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8 t,v-la*y- xv txl59xau r7rr* 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 team A runner not lose the race?

  A car decelerates uniformlypq:ogge rna y/2c 8;)p and comes to a stop after 11 s. The car's average velocity during deceleration was 38 km/h. What was the car's deccg;:any/e)qp o8grp2 eleration while slowing down?

  An airplane increases its speedef(v ;-mipw.0rkux :v from 100 m/s to 160 m/s, at the average rate of -xpkru(:viw.0m evf; $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h ac7-z1+ pbs vzpmf+ dqq-23duvu/v(ubccelerates at the 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 rest and accelerates at*nu9t6golgz 6 ty zj5, $4.0 \; m/s^2$ 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 const3jghjqn0 c)ycnp6j nl 0u38+ dant acceleration 0uc+ dpnn36h0ljg )jc yjqn83of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.8 q;yx q+isat7yz ./,gb m/s experiences a constant acceleration ofgy,az.yq7qt x+ s/bi; $3.4 \; m/s^2$. What is the cart's displacement during the first 8.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) (5t: 1k b0u0a7junh *ee9tt hgklooo /with a speed of 398 m/s strikes a sandbag and penetrates a distance of 13.69 cm. Wh jt 5eh7t*o g/l(ukba :e1hknoto09u0at is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launke g+*o81 y)gp(9l eeu0o htcd:dmy1s ched 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. Assuming the acceleration is constant, cohet g (p 0)luyeye8*o9skm+:d 11 dgwhat is the length of the catapult?

  A car starting from rest moves with constant acceleration 34ua hvm:oo/r*p 2x kyof $2.0 \; m/s^2$ 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-ltcuka35x: ; : bgo9iaw(m6 nq3ow af average accelnf;ua6k-m: iao5g w3:tbc9 xwa3qlo (eration?

  An object starts from rest and undergoes uniform acceleration. Durz6fork6noi6zary(;f* m o82n ing the first second it travels 5.8 m. How far will itr;* 2o ain(oof6 6n k8fr6zymz travel during the third second?

  An object is moving in a straight line with constant acceleration. Initial37 6l2xr5wmh8cajq inly it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it movehxjq 7n2 arw5il83c6m during this time?

  A car starts from rest and accelerates lmlo( o 07ea5tuniformly 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 at y:d3 sg ,h:bv cv*:wakl9/yqqabout $5.0 \; m/s^2$ 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 waitimvu0w q:1ceh 8xfn:)n ng at the intersection starts ahead with a constantnwhqxn8mf e c10)u v:: 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 of f cl8+onxy.j 4planet X where the acco4n8+cj . lxyfeleration due to 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 r-h/wewb(a b8 aiuipfr3wix f1*-- b )X where the acceleratioifp-ruhbb eiwr a- fb aw(*x)3wi18-/n 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 )nv pk-t6u3c(g0xg 6izor9bkwith a speed of 15 m/s on the surface of planet X where the acceleratizk)b- c 9(o i vu6ggk6n0ptxr3on 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 wit akp8ehvk*)ne n8/7no h a speed of 14 m/s on the surface of planet X where the pvnen7*8n8aho/k e)k acceleration 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 frienw4 9rje 4p23w/ki2 g pclg,xsrd holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you crl w /kc pe3p,92xj24i4r gsgwatch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocit, n/0f, vlw y3hfu6wkly after 3.00 fl6hvlw, fwy k n,30u/s?

  A bullet shot straight up returns t6 biv7vm.r+k,4zfb(q.uk z t zo its starting point in 11 s. What is the initial speed m .6ki+v zuqr.fz,tzb 7v (4kbof the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How l:-pv 2ve5scb uong does it take to returnvuc5 2bsp:ve- to its starting point?

  A ball is thrown downward from the top of a building wii31tfwh3/ p*s u mj/hvth an initial speed of 29 m/s. It strikes the ground after 6.5 s. vhhf j/ wimu3 t1ps*3/ How high is the building?

  A ball is thrown straight up with a speed61 t 9mz*rakq y4uu:gcfa u+v1 of 30 m/s. (only fill in numerical value in the: u4cu gqaa+yt91k*vru z1 6mf 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) 6*1fb+ 5kd (wmzoqibfdb 7w5-bwkcw a speed of 48.6 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 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 is the velockm e; gy4sq1;jity at t = 1.0 s?

  In Fig. below, what is the v/smt.dj (xxzm5,pj / jelocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s?t+h(oq,e99 gwqfmv xvl *qe.,

  In Fig. below, what is the velocity at t = d5pr0,x g)p pt5.5 s?

  In Fig. below, what is the average xdf2xux(rkn*o)y7-mxb.gg+k5n 3 p svelocity from 0 to 4.0 s?

  In Fig. below, what is t6- zlq6 oq/avrewm5 7ghe average velocity from 0 to 6.0 s?

  In Fig. below, what gv puqa/.sf74mmah0(1 cbb 8pq e,6bq is the acceleration at 1.0 s?

  In Fig. below, what is the acceleration a1iy0 hb7 k uqw-m1 aev-cz;-nbt 3.0 s?

  In Fig. below, what is the averagfnuu 7x5x *oz,e acceleration from 0 to 5.0 s?

  In Fig. below, what is the average nbg-v-x9-h) pit)kmbacceleration from 0 to 8.0 s?

  In Fig. below, what is thxv b umf38c4haksx2b )5jj6;je displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloci/;yomegg7 n 9oty}

  An object can have a varying speed if its velocity igem5gh( 0p3s zs/j5dg s constant.

  The velocity of an object can bef4;fyojzwrjz06tcvj fx 6 9+) negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a grun/dd 8 +e; ),9w ww(qt pbx*.aiioepyeater accdi,oy+da n*w. wt9 eiex; pw)b(p8/u qeleration.

  Two cars emerge side by side fro6w (ft efza*4kxw +pwhex +q*v5io4e7m a tunnel. Car 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, my;fun2ykc k4(eh c1ft/ m9x acceleration decreases.

  A baseball player hits a foul ball straip)yr1b/sdttdg9u qwq v( w1(, ght up into the air. It leaves the bat with s ,dp9)ydqtgb /qrt 1u1w(w(va 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 acceleratioh4- xa4arvr8 0znlwr 8n, how does it chanz4lnvw0-4rxr8 8r a hage if air friction is ignored?

  As a freely falling object speeds up,jx8jdfya p9gff e/ybsy- / )n 5a5r)7i what is happening to its acceleration, how does it change if air friction CAN NOT be ign/f-fygb )8ifd7a9)x5j a /neyps5yrjored?

  An object that is thrown vertically upward will return to its orig5 9 n:vodkp,vninal position with the same speed as it had initialn 5novv,dp k9:ly if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity a-:ka y5)1yt oumlf; ptnd nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceld jj 8nks+9c/meration at the same time.

  An elevator moving from the second floor to the fifth floor making no stop+d,x wod;l *fgs along the way haowd g+xl,; f*ds zero acceleration all the time.

  A rolling ball moves f;).g r+xf yytlrom $x_1=1.6 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ai-xjkb :,;p c,mp5dm qround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.3 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its train ;0a2)ye7ghvsh9usi *rqrc g-er in a straight line, moving 95 m away in 9.0 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average s 7c-0sru; 2hg*s9eaqgyh riv) peed  (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 fromb o6g55 j(wtfr $11 \; m/s$ to $24 \; m/s$ 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 cv1oduveh3: vzdn8 0i /au,q7i; g4sj $15 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of 8q:k w qycw j6dt*/4cv$31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of thmg4f6 yxv 130j0nkv cvcsx(,fe blocks to essentially top speed aboutfsgcmk6 3c 1vy0x ,fj( nx0vv4 $11.4 \; m/s$ in the first 14.2 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 speed of zy;q,hsf4 q .5m; nhn 1wpk,uo$18 \; m/s$ 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 long7pakob hqv(n1-c9 nw s05x 4un on the highway. Assuming a deceleration pb onvwqcxa-n 5( s4k0n1 7hu9of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gogsz.8ziso3r: s5/1ig, *wdb cyhw n)bq-vm +iing $25 \; m/s$ 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-msy8w6 ancro2.p3u6br run in less than 30.0 min. After exactly 27.0 minorb6yn8ru 26wc.ps3a , there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$