Suppose that an object travels from one point in space tov px+yr--m 4pp another. Make a comparison between the displacement a4y p- px-+mprvnd the distance traveled.

  When is the average velocity of an object equal to the indmvn(,z pnj50d. -mfustantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to odu5xkf4sm8,smb2rl+o , pi (sixty in 8 s". This is a d 58(fmsl4s oxmuio+pb ,2krd,escription of

  An object moving in the +t5:y) i+ d6b9j-dmo;ridqhhox axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow downjqrkp01g(z - lxf rx9tik) 52t as it approaches a traffic light. Make a statement x t)r pqx2t5z ikgl(91r-kfj 0concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins tw,r+u 1*yy- hdmr )zoeo slow down as it approaches a traffic light. Make a statement concerning its acceleratione ru+ -ywo1,ryz)hmd*.

  Suppose that an object is moving with a constq ,i/bw f8d -d ckvou+2t,;gvmant velocity. Make a statement concerning its acceleratmcvudf-v2gio btd 8k,,; /wq+ion.

  If the velocity of an object is zero, does it mean that6y:4yddea p- l9hj 0kv the acceleration is zerojh60lk:4 avy9 -ed dpy? Support your answer with an example.

  Can an object's velocity change direction when its acceleration is constant? pn s 46gd:vz/9efn)ylt ,vs(z Support your answer with an example. y4pf)l(s/9vzndnz v,est: 6g

  Suppose that an object is moving with consta.gt 4(1 x:dc+ fpxidwynt acceleration. Make a statement concerning its motion wgyxwf1c d+dix4p(:t . ith respect to time.

  Can an object have increasing spydx gmr;ye,9ode.l e(4:x 7 y jn7fx0eeed while its acceleration is decreasing? Support exe9d;7l7r fe(xjemg: oxyy.y, 4n0dyour answer with an example.

  Suppose a can, after an initial kick, moves up along;q)0 j1vgj,fe1guk1zi5), v y bsnw fo a smooth hill of ice. Make a statement con;j1izfew y1f)gujv5, okv 1)0s,nbgqcerning its acceleration.

  Under what condition is average velocity equal to the averktf19 dn-l lvwra;br;35; j ezage of the object's inirwz3bjfk; ant;;1ld vle9r 5-tial and final velocity?

  Objects A and B both start at rest.cz2zdh0))+p 8ivovxx --g,ilzgack 9 They both accelerate at the same rate. However, object A accelerates for twice the tim di cic,-)a+g2v9ox0 glhz)xpz-vkz8e 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. k4r928+ h(f khv rdffr However, object A accelerates for twice the time frhdvr2k k8(9rf+4hfas object B. What is the distance traveled by object A compared to that of object B?

  When an object is relr(ru0q zj,l mx1/,o 4lv*aaff eased from rest and falls in the absence of friction, which of the followingar0u*ja , lqm(v1,rfx fo4z /l is true concerning its motion?

  When an object is released from rest and falls in the absence szm ,0wmaj: r i 67ovh9qe(9reof friction, which of the following is mq9 oz0m,s7ejr(rih vw6ea: 9true concerning its motion?

  Suppose a ball is thrown skqu bc ox(ztfq 6 4.bz*0l+pk2traight up. Make a statement about the velocity and the acceleration when the ball reaches the highest poq.fk2t4pk b culzbz + 6q*o(x0int.

  Suppose a ball is thrown straight ucn2 y1z4hg 5pvp. What is its acceleration just before it reac2y 5gnhv14c pzhes its highest point?

  Suppose a ball is thrown straight up, reaches a maximum heighz cln 2/yz)9crg 8w/kkt, then falls to its initial height. Make a statement about the direction of/8kck) l2r zc9gynwz/ the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, the7k 5a atljo9in3,, z*0kds bzon falls to its initial height. Make a statement about the direction of the velocity and acceleration a kois 97anlb 3,zkj5od,zt0*as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resioax9w,- wn9y u6i3kko stance. Make a statement concerning its acceleration nw i,u k9wo3o9xky6-a.

  Suppose a skydiver jumps from a high-flying plane. mgse0:(slhrh +20b wjWhat is her acceleration when she she reaches terminal b+2:hm0ejlgs(h rs0wvelocity?

  A ball is thrown vertically upward with a sp64. aqyd7i zwn.bnm s/eed 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 bal wamb76yzq. n.s4d/n il 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 buil2qerp3zg16zc wd5u,hu z wbzs *)0l+vw9-zklding. One second later, ball B is dropped from the same building. As time progress)kh2z 5w,zec 0u6+*zvzlu1g bwp93qrld- zsw es, the distance between them

  Ball A is dropped from tn wfhh831gz-iqzx:2z7c jy :che top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference1zq: z7z:2 fxchjc- 8i3nhg yw in their speeds

  Two objects are thrown b xa o4p) g*xgao(z)l:x li.3* k3opkxfrom the top of a tall building. One is thrown up, and the other is thrown down, both with the same initialg*a3zk : (ox4)*oxx)b oixgkp3ll.pa speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A secon1owfzjlc o+ 5.rgfs(b(oi 38id brick is thrown straight down from the same building. They are released at the same time. Neglect air .o +izw5s or gi(1l(b 8cj3fofresistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocit pkte/z) f8sj0pk7ld3jk5 .s )f3mfify in the +x axis. The position ve 8 3)js fkk0i5)fe.mlkj 7zfdpf/st3prsus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The po ,b10g)owq7p,ug7 u;rjqh g6+gr cehb sition versus time graph of this obpqc0g)w+g 7u;re1 qb,r7hu6 ,bgh gojject is

  An object is moving with constant non-zero velocity in the +x axis. The velocity 7:n0lti: cixg(y: cyq ve 0:(i:cyn qcli xyg7:trsus time graph of this object is

  An object is moving with constant non-zerowa5ab vg)a57pff aw+7 acceleration in the +x axis. The velocity versus time graph of this obja+5 fawgw) afa7p5v7b ect is

  The slope of a position versus time grap gd6o+lyzy- df z4oa (*w;s+wjxgze6, h gives

  The slope of a velocity vjpvy5ru 1rk 5lg+l-5f ersus time graph gives

  The area under a curve in an accelerak9a c(euvs,gdvi5b6v mc; o:9tion versus time graph gives

  The area under a curvcwujo7)+ p 1cne in a velocity versus time graph gives

  If the position versus time graph of aifng7tz8 zh*i9 a-sjk7 xw, .an object is a horizontal line, the object i a.kg8-*its9hxn iza ,fzw77js

  If the position versus time graph of an object is a vertical line, the c1 ogdem*7)wl object is o*71)wmdec gl

  If the velocity versus time graph of an o k/m kp.qaaz* r/fwhmlt /5kyv0 n;1m(bject is a horizontal line, the object alf( kw*v0pkm 5h//krt/amq;zyn .m1is

  If the velocity versus time graph of an object is a straight line maeg7*p9.bsdy+cqi 0p 9f:ppcfk43 wgnking an angle of 30 degrees with thec+gkd903yqen:7wpffgp p * c. i4bs9p time axis, the object is

  An object moves 15.0 m north and then 11.0 m iek5hz 2h7 2lmsouth. Find both the distance traveled and the magnitude of the disp l2ie25kmh7zh lacement vector.

  A boat can move at 30 km/h xgaewhu /+h tr) f;+r6o7cr7h in still water. How long will it take to move 12 km upstreaftrw ah/+ +7gehro 6 );cx7uhrm in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 139dlw88r bsbf 609 m)

  What must be your average spa)nvsthno7 r8l1pcf:kb254h eed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 kmgw/qc-ywyo )sd;- j/*uzd 7 w fgjfr+:) in 2 hours and 57 min. What is the average speedzcd/wy-jswu w -*o :rd7f) /;gjygf q+ of the runner in m/s?

  A car travels 90 km/h. How lon*q10 mdz xzg;eg does it take for it to travel 400 km?

  A ly (light year) is the distance that light k bg xc.3s-ict32ama(travels in one year. The speed of light ic.bcikma xat3s3-g( 2s $3.00 \times 10^8 \; m/s$. 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 ).)ypt/v vm,8ummejdthe side for 4.0 s, how far do you travel during thj tp ).mm,yvdu/v)em8is inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 2mxcf ej 039 .ssf3 txn3(nvrs100 s, your average vel2x3fsmsnx3sn 0 rv 9(tcje 3f.ocity is

  A polar bear starts at the Nortgu sy45opj84 xh 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 st uyo4s5g8p 4xjarting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the Nortw: 3p8u l7fa kxvag3) 88v -e9bqumvqkh 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 trip takes 45 min. What was g e:v v78qa-ul3)x v 8ak39qukmbpwf8the bear's average velocity?

  You are driving home on a weekend fro;9)r hegn+scp m 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 angc; hpns er+9)d 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h y4uy3x 8uu pm1and 160 km at 100 km/h. What is the average speed of the motorist for3 umx4u1py8yu this trip?

  A motorist travels for 3.0 h at 80z.zwj h/,t8 up km/h and 2.0 h at 100 km/h. What is her avera puj,wzt/h8 z.ge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then ;3g-9 l ltkzveat 250 mi/h north for 750 miles. What is th- kzte93gllv ;e average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) 2c0pf2n 6whmw+kta(ifor 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 runner not lose thtnmhi wwpk02c (a+2 f6e race?

  A car decelerates uniformly and comes to a stop after 12 s. The 4 jkp8ref:nc +ds, a1e sh.w/ecar's average velocity during deceleration was 69 km/h. What was the car's deceleration whisceeer,/w8 p4k. fajsh +1:dnle slowing down?

  An airplane increases its speed from 100 m/s1b+s h)ks uv jfm:rpo;1toa*5 to 160 m/s, at the average rate of o1;5fa ph)j1k*ous+bmr:t vs$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate o.ut3 60eos-zxjgo nb s,x3)uuf $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelera paz: l*0h3q i 9+/zrvt,6/hxrsbhtektes 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 w3j7l7locat 9y6un ;yconstant acceleratioctayj7 7u9o6 3nllw; yn 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 3.1 m/s experi5 z84 bcyrgnb+ences a constant acceleration of zgy5b84 b +cnr$2.2 \; m/s^2$. What is the cart's displacement during the first 8.3 s of its motion?

  A bullet moving horizontally to the rightxm)6c- lb-phjq)ym*94a rbpx (+x direction) with a speed of 474 m/s strikes a sandbag and penetrates a distance of -qxhpy-pbx 6 ca)mj r4lb)m9 *22.79 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrierf2:xb6fj6tpeu*2n l. 6o dwxt. 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, what xpofd 2wnj 66.f:6*elt utbx2is the length of the catapult?

  A car starting from rest moves with constant acdmia3x(ek(dy +aeq:/h :waw:celeration 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 adp:ufs.v s1wvd a5 0.qjz +pyn7:xu)qverage accelera u xdnd0:: pz+wpu 7)vsf 5js1qaq.yv.tion?

  An object starts from rest and undergoes uniform n1plv(o( sm5wjy qi.1acceleration. During the first second it travels 3.6 m. How far will o.i(l1v ysjp w1mqn5(it travel during the third second?

  An object is moving in a straight liner yhgay.2 /fv( with constant acceleration. Initially it yv2. / hyf(agris traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from re; 3t*jcf4p * kb4ovkubst and accelerates 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 road can decelerate at about f4za xuzmq3; -$5.0 \; m/s^2$ 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 +0jufgii4y y0 waiting at the inters4f+y 0uij0y giection 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 the s .g. jl;:7t dt-ia3yw ewykkg2urface of planet X where the acceleration due to gravitky gkdw:7tegiay3wj- .;l2.ty is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of voi u/z40c5 1qo,hfzzvc4 k+w12 m/s on the surface of planet X where the accele1vvuw/h ,450o+z co fzi4kz qcration 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+s8iwix i5 kmt0*fc(b/s on the surface of planet X where the acceleration due t8fmb i(x*ksw0 5t +ciio 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 u)thzo;;u;3smfm qbdr s8q .( upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity f)s u hu;qmsr; od.zqb;(83mtis $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usual0k )3hxs uu-(u5 jmz5)b: yll3kcaasuly greater than 0.10 s. If your friend holds a ruler betwe )l)bls5u:3ay 30khumuu5-z j(cakxsen your fingers and releases 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 19.6 m/s. What is its vt4u( 0gzm* dquelocity after 3gqu u(mt4*d0 z.00 s?

  A bullet shot straight up returns to its starting poinbxhckldny g:0 z/msbqv4l rw ,w(+q1 ,rq; v;4t in 18 s. What is the initial r xd4mwkr;bqg:lsq ;+c yq,h/ nvvb1z0 4wl(,speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s.2d sn /z ytdgxo+k16g- How long does it take to return to its starting point+ 2nzo gkt dd61g/-sxy?

  A ball is thrown downward from the top of a building witm,6ushmuq if:y z 7:m-4s t-uwh an initial speed of 18 m/s. It stri : y -6swm,4mui-7zm uftqhus:kes the ground after 4.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fil) qn5 yzf8m+xe/g nlo.l in numerical value in th8yf+qln)gzx/n m5 .oee 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 4rf/vp4q ck-j; 6.6 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 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 velo817myifforzs (s xi92city at t = 1.0 s?

  In Fig. below, what is thehp wl3u+guv4 7 ,/3.3ofp-adpgu kbzf velocity at t = 2.5 s?

  In Fig. below, what is the ve.xe4dhsn x)yzin*3;-gh3oio locity at t = 4.0 s?

  In Fig. below, what is the ve:)3 bgv5zuh felocity at t = 5.5 s?

  In Fig. below, what is the av :qhvml (n:r2.mjy;tqerage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 4v,h c z:x7zbm;hauc5to 6.0 s?

  In Fig. below, what is the acceleration at 1.0z6b ;n2oj/uqz s?

  In Fig. below, what is the acceleration at 3a3gshqcr 5l+jr,v2(c1zjunym 12c* g .0 s?

  In Fig. below, what is the average acceleration from 0 to +ki3m(;nhax 4zab;l v 5.0 s?

  In Fig. below, what is the average acceleratiz.ioi:cr+v9 chx+ry bz(wvw s x/ q()+on from 0 to 8.0 s?

  In Fig. below, what is thz.c, xv0g w.tu/.awak e displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitu l dg i)i7qw(:tyg25ty}

  An object can have a varyingtjqs5( l,v)o n5/3wzs8kasmc speed if its velocity is constant.

  The velocity of an object can be negative when its acceleratibm6 xisq nw*03db:o6lon is positive.

  If one object has a greater speed :ouj* e2teg** byzf2hthan a second object, the first must have a greater accelerat2u* ebh2g z*oeyj:*ftion.

  Two cars emerge side by side from a tunnel. Car A isx8ya i.m6 i347 8dp4xbvvy;cot9cm t t 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 acceleration decrea bzko3r , 9f;owuec4i(j2 ij1fses.

  A baseball player hits a foul ball straight up irx/*p3 idc;i:ijpko 5elx- u.r : nbj8nto the air. It leaves the bat with a speij;3cd* /:orx5j un-8.el :p bi prkixed 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,0rg(ucl kjt*j th3,1r p4d v0s what is happening to its acceleration, how does it change if air friction *(gd 3crsr0uvpl,k4j10t h jtis ignored?

  As a freely falling object speeds up, what is happening to its acceleration,(je x8q(cpv a+ id ja;9x.iw4n how does it c(.ndj(i8xj;eq +c v9awx4pi ahange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will bw;a: vm hwkr ;.4odq6return to its original position with the same speed as it had initially if air resistance is v6; qhmwkro dbaw;.4: negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero iw(4uo8+upzyq bb4q +velocity and nonzero acceleration at the same time.

  An object can have nonzero veo15ld x,,demtlocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stopsj 9;0adunbl kk mr.kv63 8t:cx along the way has zero acceleration alvab3u0k 9t.d xcmn8;l :k kr6jl the time.

  A rolling ball moves from5yl2 7gntcmywe(0 1kv $x_1=2.4 \mathrm{~cm}$ to $x_2=-8.6 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quartev 39i6gv,web6 6kgkly bv /dv-r-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its tgugs n26ibbr036+l , gcy*dz m0g reak7m*:kv rainer in a straight line, moving 88 m away in 10.1 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate* cg3 a6gblr7kye,ig *vm6 sug0:z2b+dkn r0m (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 fro+ux35x,b,d bfs;d bmim $12 \; m/s$ 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 from qc6 s5f)b+fr8 qxz(nx$17 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach crwy 0b.z/-r 4 5bfn.j+butxqa speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to esstjcbs qn7,0a g(4zgb-entially top speed abou7gjb4z n s0acq-t(gb,t $11.0 \; m/s$ in the first 13.8 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 from a speed op/:h s/gw2hkap3 n0 kpz0a eyr2+wqd0 f $20 \; m/s$ to rest in 5.40 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 on the hk4-d.8*fygy0bx i n mhighway. Assuming a .- xbi4y dfnhm*kg08ydeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truwmwlm, e j2f*(ck going $25 \; m/s$ 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).    $m$