Suppose that an object travels ff4 nv;kh0kcgkg-j7 mtd n6e58 rom one point in space to another. Make a comparison between te4 5 ;-8tgk6hgn cvk70 jfnmdkhe displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous ve 9uxm7 7fgcv2re 7bf0u7ad; telocity?

  A new car manufacturer advertises that thwo:qf7f3/fx-x d1ql:e ocur +- uxnm5eir car can go "from zero to sixty in 8 s". This is a fxl3+ f7mc1xw q:fd-xu-: o/ r5en uoqdescription of

  An object moving in the +x axis experiences an acceleratioib.zd sxswu 8mg,yb: 0.:gr k*n of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Eastcae2j skf. d l)2s1fz) (+x direction) begins to slow down as it approaches a traffic alzes) 2.ks djc1)ff2light. Make a statement concerning its acceleration.

  Suppose that a car traveling to th)3cvi(- pm tu5 rj;l woibjx+2l0sch/e West (-x direction) begins to slow down as it appr-iih+r w);3jub/0xp loljv5cmt ( 2c soaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant -o3 jz zinh3 )dz(gm,.mnd7rt velocity. Make a statement concerning its z-.3(z nzd)r ngd3 h,jotim m7acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is vhr1y /nl . z pce9+hvl(.er*1fy;gfxzero? Srh1g 1fh.yz y.vf/p+9l ec (e;*lrx vnupport your answer with an example.

  Can an object's velocity change direction when its accelera j9o7h 5jg,py 8-4pcmj hwdkz)tion is constant? Suppoj4h7dw)9 ppgj,hyjco 5k8- z mrt your answer with an example.

  Suppose that an object is moving wn;s6cv s9d2o uith constant acceleration. Make a statement concerning its motion with respes vou;c9 6snd2ct to time.

  Can an object have increasing speed while its acx r)1s.l uz66w/bbz(j: p4aoxgs ml7p celeration is decreasing? Support your alosrzx6za:s6(1.bmgu/ bljx7p p)4w nswer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of icez0 adirgogzby 2+2.s8. Make a statement concerning its acce2y0sd+i8b.2o g agrzz leration.

  Under what condition is average velocity equal to the average o2nqhj;f; q78 ,u zvwnuf the object's ini7uz,2nq8njuw v;qh; ftial and final velocity?

  Objects A and B both start at rest. They both accelerate atfg /x8b yzpq:9pmr3da --c i+t the same rate. However, object A accelerates for twice the t ifcmzpd / -tyq-bp8x:+g 93arime as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start frot s( amd87vaf:m rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Was8t7a(dvm f: hat is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absencr49az,:u, iel6wu mxp /b0t zve of friction, which of the followie a6tp: , 0l4xzvi/r,buw 9zumng is true concerning its motion?

  When an object is released from rest and falls in the absence of frict94) pabmqpje w*6izb) ion, which of the following is truw)jiz*pq)94 peba m6be concerning its motion?

  Suppose a ball is thrown straight up. Make a statement abou;7 .rm+ ypp+hdhjdf f*t the velocity and the acceleration when the ball reaches the higy*fjp+7 h dr;+hfmdp.hest point.

  Suppose a ball is thrown straight up. What is its acceleration (pt,wqt6 c-kwjust before it reaches its highest point?wp qw6(ttk-c,

  Suppose a ball is thrown straightw4 ff1/ lscom7ke4xyq515l2;a qj rzr up, reaches a maximum height, then falls to its initial height. Make a statement about the direction r74 kc551f;o e/a2 qwjqyz4xs fr1llmof the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls +adbwo87 y*n 7ucp0q pto its initial height. Make a statement about the direction of the velocity and acceleration as th 0ba7o+nwu7 dc qypp*8e ball is coming down.

  Suppose a ball is thrown downward in the absence of air9ioko/7vqd l4pbf fl cf6/d:8 resistance. Make a statementkqcb97d4f8o :oill p/d/6ffv concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratio/8 n f dnp0yhw97grlnn+ dkhfb)41 ,adn when she she reaches terminal veloldbh9 nnk/ h8f7r+ a4d gn,nw)1y 0pdfcity?

  A ball is thrown vertically upward with a speed v. An identical second balla3u,)lzk )hrm is thro3a hur))m zl,kwn 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 second ball go than the first ball?)

  Ball A is dropped from the top of a building. One sec6wtoko+bvf ;4 ond later, ball B is dropped fr b t+wf6vo;4okom the same building. As time progresses, the distance between them

  Ball A is dropped from the fxxj--73kmz p5b 1nostop of a building. One second later, ball B is dropped from the same building. A5-po3mx zxj -bksn 1f7s time progresses, the difference in their speeds

  Two objects are throwny /2l luhuw20n from the top of a tall building. One is thrown up, and the othlu ln22yu0/wher is thrown down, both 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 sec/ :vmrky 6 ql *tskjr0b-r6p3iond brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acceler rkvm/:6rj6q- l *0psy br3tkiations of the two bricks.

  An object is moving wi , qzi 3tdz03axbl6s22qbemebj9c/ .lth constant non-zero velocity in the +x axis. The position versus time graph o cqq092 z3 /axe,tj3 bd2ilmbz.bs6lef this object is

  An object is moving with coxotb7ho ic*pg 8f(o4 3bg6fn9nstant non-zero acceleration in the +x axis. The position versus time g(g pntgfbo986b ich74o*3x of raph of this object is

  An object is moving with c25i6v +l+enqbm z m+ apla*vq3onstant non-zero velocity in the +x axis. The velocity versus til6*qa azqp+n3e2l m mv+5b+ivme graph of this object is

  An object is moving with constant non-zero ah0+ iebkl) 1 lk:4cgnycceleration in the +x axis. The velocity verkn :e)1lb ch04+l giyksus time graph of this object is

  The slope of a position versus time graph gi/* u.v2 e6tjfzkf3zj2 s3rndyves

  The slope of a velocity versus timho 16)fcbm8v **r s44ept efkme graph gives

  The area under a curve i f96,:o8 ;-n sddjmnof s-llqhn an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph givesx )u (s+d d*p99ylw 2rmubk8eb

  If the position versus time graph of an object iqm yvm00pqcb,z6f r2. s a horizontal line, the object isq0bm 2y cf6q,m0r. pzv

  If the position versus time grapin- tx u1 i(suqa;hv44h of an object is a vertical line, the object isu(h-a tnxs14iuq;vi 4

  If the velocity versus timex,2dak52kcr-asfga (xg:8jf graph of an object is a horizontal line, the object sa2( xdxc5:fg2kk gra-8,fa jis

  If the velocity versus time gra 8h)7.ycbulyb0okk.z jm,c 7uph of an object is a straight line making an angle of 30 degrees with the time axis, the objucb7h 0 . )bjo.k7zuylkc,y8mect is

  An object moves 15.0 m north and then 11.0 m south. Find bot6b2u8ic.whugme;f7sz;ar) eae/v z ,h the distance traveled and the magnitude of the displac6e z72 zh;uwae)i gmr vfc,b/ae.;su8ement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 120d 28k(-kwxfe qsv(ft)t4 bts km upstream in a river flowing xt0(- 82wvfestfq kk)(tdb4 s 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 rso 5;4reiqpgd *f a/y6q oh*8m)

  What must be your aver5tnq* (m/dm0kw* d iaqage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) i lswko8+(/ vjbn 2 hours and 57 min. What is the average spe/ko+j(wb 8 lsved of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travtcxs6yi./g 4 tel 400 km?

  A ly (light year) is the distance that light travetbyp ; ;f1rzr7g u2yufe/1u4els in one year. The speed of li; r;y fpe127uuzgb1yufe 4r t/ght 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 zdhkjn g5*e, l:r fr92along a straight road and you look to the side for 4.0 s, how far dr9l fnek 5:hrd2g*,jzo you travel during this inattentive period?

  If you run a complete loop around an 3rcodqw;,c6p5(i6b5ruov6ti j qp x yn5p.u-outdoor track (400 m), in 100 s, your average qxwooiuu3 b tnrp ,v5;qjccp5- . 65(ry6dp6ivelocity is

  A polar bear starts 5ro ( st4a /nboj;f 4bhxz0w)eat the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wex szob4j0)frh/;oan wt5b 4 (est 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 35bz 8yypzf-ptravels 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 trip takes 45 minzpbpy yzf5- 83. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It y1k 70;d+2 und)oos h+vvcfmiv-pn g)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 home- ;v +vghs)k17vu+ ydcom20noi)np fdtown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/ab:m5tb xv :yg5czi4v.2;pfx h. What is the average speed of themp xx.i;fa:bt452 cgybv:z v5 motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 ;bl klx0c+t .sh at 100 km/h. What is her average speed k + ct;llsx.0bfor the trip?

  An airplane travels at 300 mi/h south for 2.00 hjzy mxo 2i8wj4ay: *z1)lu7ei and then at 250 mi/h north for 750 miles. What is the average speed for the tripii j12u7*j m8xayoz zy:4 l)we?

  In a 400-m relay race thwmc awn:l1jah6 zx;-zu- g7 v-e anchorman (the 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 team A r6;1hl cwvw m-7- az jx:nz-augunner not lose the race?

  A car decelerates uniformly and comes to a stop/ kj.4sb*ljxm after 11 s. The car's average velocity during deceleration was 57 km/h. What was the car's decelexj4j./ kbml*sration while slowing down?

  An airplane increases its speed from 100 m/s to 160s6ht )o3h9yljb04vcay 1yy 4u m/s, at the average rate of sjh 96yyat) yhb 3lv y104u4oc$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates (ge; 9 qqs4pc1*ie kzvat 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 acce, dpzv6w,s) 1f0:yd n;pbmre cua97be lerates 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 speeds up with a co)oam/v +kew:8 dqt1 dnnstant acceleration:8tdd1 mnako ev+)/q w 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 ofi*i bvu ik2s/1 5.6 m/s experiences a constant acceleration of 12v/iki ib u*s$4.6 \; m/s^2$. What is the cart's displacement during the first 9.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) w7z dc,gvdzhq ,qb63gj )t5srda..d( vith a speed of 492 m/s strikes a sandba, c( .zdq vddz)b65jt7hr,vd.3 gsqgag and penetrates a distance of 62.25 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult oxd:3v 5agg 8kon 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 accelera3g5:gv d 8okxation is constant, what is the length of the catapult?

  A car starting from rest moves with con 3phv)scgz .7vstant 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/hl iyy:5* t9 lme/b;jis to 80 m/s in a distance of 200 m. What is its average ach je5byymil*;/9 t :liceleration?

  An object starts from res eh i*,mjo8e+6gumca+z; r :tst and undergoes uniform acceleration. During the first second it t*miu+ mcs, 6 8;ez:g hja+eotrravels 1.1 m. How far will it travel during the third second?

  An object is moving in a2 bz,d ) dhps5ds09youo k:mq,t9,uj5 sj1ig m straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does ih q1j sio),m s umj:5uodk9dz5p yt,b 9dgs,02t move during this time?

  A car starts from rest and tdp:7tyb igzy1i*p3; u,rx5jaccelerates uniformly 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 roadh)r;zb c d8;ds1d hg.q 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 that has been waitu6qxsr.tz9 n ,+igf8ning at the ing9rsu8n+zin, 6 xtfq .tersection starts 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 upward with a speed of 12 m/s on thew9t) 7l owcpm. surface of planet X where the acceleration due to gravitpw.co9 )7 wltmy is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwarifu8p1n(p g l h4-qj5)g exfq;d with a speed of 12 m/s on the surface of planet X where the acceleqg)45n8xe -i f g(qjp;fpu1h lration 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 with a speed of 15 m/s on the58jg(mhett7:wj( 8a1m.nu eq p 3 zlgc surface of planet X where the acceleration58ceqjza8m :1wnl humgetj(.3 7pt(g 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 planet Xhv .gigg.1 p aq54+7h:hrng uq where the acceleration due to grah qrgg5h7nvu+gh4 1: qi.g.pavity 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 fzkt z2 919rrvqriend holds a ruler between your fingers and releases it without warning, how far caq2z9kt9r1 v rzn you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s tyo *6 u2mqkn; oprdnp5+*r*a. What is its velocity after 3.00**n otdk2 r; ap5ou+ mqpr6y*n s?

  A bullet shot straight up returns to its startingjo,h;7o.jhgto v. z;c point in 7 s. What is the initial speed of . zo;ctgoj,v7hojh .;the bullet?

  A ball is thrown straight up wf6mev(d76jxj ith a speed of 36.0 m/s. How long does it take tovjj(67d6xe fm return to its starting point?

  A ball is thrown downward from the top of a building with an inko/q:l1a,u yk p p6c8citial speed of 22 m/s. It strikes the ground /o:1k c68,y lk apqpucafter 4.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fiu+lmxtm.2v0g0 f :ks cll in numerical value in2lc0m:xm. 0t+sukgfv the 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 2sg p5z+8lvmo6 a.;z zq)o0nwd3.1 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 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 velocity a3 l(s /fxl(flj gyyl ((:owwl/t t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 j)7q,-n t ed:dm*kewss?

  In Fig. below, what is the j+ r2+mbb5 icesx* kqm*:ve/ rvelocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 u+ bcrpklwa1n77 q.hz6 g l,f,s?

  In Fig. below, what is the average velocity fru4ehgq qf. j92mxthn4foi899h q vy :3om 0 to 4.0 s?

  In Fig. below, what is the avea*.ogvt h7e;h rage velocity from 0 to 6.0 s?

  In Fig. below, what is the accel 3 +cl 1bgomur8jm/ 1p1f3himveration at 1.0 s?

  In Fig. below, what is the w10jfedq:0lp/ ) -ggohd8bv 7vmk as4acceleration at 3.0 s?

  In Fig. below, what is thmr , v ,gejmxr0j(8u4t0vk2ioe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelybm( i1 k:ugw0v z2znz;rumvc72 4s kctw +91seration from 0 to 8.0 s?

  In Fig. below, what i3 8tq phwu9wn/s the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, kysf/osg i)zsukxk*nr 0(117 velocity? {speed|velocity}

  An object can have a varying spe + mr-rstmo4)med if its velocity is constant.

  The velocity of an object can 3im we ch ,4odbea8:s)be negative when its acceleration is positive.

  If one object has a greater speed than a 9 6e;hj wq9l37aqrgxpsecond object, the first must have a greater acceleratijh9wl x q;69gae 37prqon.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spec06nmdpdx xn 2/u9f2jed 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 acceleration decreadsuh;zqp/ tf5gcrjwv.; ;l 77 ses.

  A baseball player hits a foulad+:-/ey tywhko-,adbm z m -)sd 5ob+ ball straight up into the air. It leaves the bat with a speed of +ao/s:h, -mb- bky)5wd dzoadt-+mey$120 \; km/h$. 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 objecs (d, 2vxm3guit speeds up, what is happening to its acceleration, how does it change if air friction is ignods2vumi 3,(gx red?

  As a freely falling object speeds up, what is happening to 69b;1ceitm.yjfd fe3a7+a cz its acceleration, how does it change if air f6fceb 1dzfyei7 tcm;a+ .9a 3jriction CAN NOT be ignored?

  An object that is thrown verticalx8/6 udq9:zgft4ivub-5 em)d vge2xs ly upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altereb6e/gd:qvg) xf5v29z e8u-td 4xiusmd?

  An object can have zero velocity and n nrw 4qpkd-c31dkdz-( onzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at8oz x1s0wa(k, vn3 opj the same time.

  An elevator moving from the second floor to the fifth floor maokeutyy0z .25 (xj 4acking no stops along the way has zero accelerac 0jk(uyx o2 ae5yz.t4tion all the time.

  A rolling ball moves fr*bx ( -;7zhwqwzntu ,bom $x_1=2.7 \mathrm{~cm}$ to $x_2=-7.9 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. 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 $t_2=3.3 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around zde(y1k k+oe,c0 (f4l qzh8 eva quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.6 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, mouisqbr4w, d0r8b 6/vkving 90 m away in 10.4 s. It then turns abr/b4qsrk w80, uv6dbriuptly and gallops 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 from hv) zabg ,g;.j$11 \; m/s$ to $24 \; m/s$ in 5.4 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 fromuroo/mdbf+r 4 fi9;j xdaj*3 2 $16 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s. nwyn +mnwc1huyf 07l7whd*5peed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprint+hrfb)c1z64f xr/j- w bzct3fer can burst out of the blocks to essentially top speed abou-rc/ f bfbz1+6fc4x3h rtjzw) t $11.1 \; m/s$ in the first 14.8 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 fro3 3 c4(pmrlnl;qevcz 1m a speed of $18 \; m/s$ to rest in 5.54 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long*lx5d7jg+( vcn.10rzfk pcu k on the highway. Assuming a dpvk nug j f*dx( 1.57l+kczr0ceceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g /3g tt3(8g11yusj-lok 7 pps)aep aysoing $25 \; m/s$ 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 10b2 8iwn2t2ihn ,000-m run in less than 30.0 min. After exactly n 2ti82ib 2whn27.0 min, 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?    $s$