Suppose that an object travels from one point in space to another. Mak;wuh 2i5-g9eo92 igx xkcrw 2he a comparison between the displ k2ugxrhi5o w;2chg2x ei-w 99acement and the distance traveled.

  When is the average velocity of an object equal to thokh*4+wly g4be instantaneous velocity?

  A new car manufacturer advvqv1 qx -,cjt:yv(af: ertises that their car can go "from zero to sixty in 8 s". This is a descriptionvqx:ay-c(t1v :vq jf, of

  An object moving in the +x axis expyjecc3qjk1.mik-dpak5l i-6 nk l(h/*rz-d 2 eriences 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 down tpp2 uyt0gbfn7z -, dh,uvu2n*pi/ m5 as it approaches a traffic light. Make a s ut-p /m 2iu0y5vfdg,p7ztu*h2 bp,nntatement concerning its acceleration.

  Suppose that a car traveling to thelz 9nuz l gi3e/m/b:a( West (-x direction) begins to slow down as it approaches a traffic ligh9llu/n (a: zeb3/im zgt. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity(ap87 0 hw5obrs5qb (v3jnf ny. Make a statement concerning itsp8(b j(3r ayo qv50snw7hn f5b acceleration.

  If the velocity of an object is zero, does it meanxxx k,;fe82p)qko;ly that the acceleration is zero? Support your answer wi ;lex)28,xk;ok qfxpyth an example.

  Can an object's velocity change direction when its acceleration is constant? Su9z4 n8vqceva5yio 6 okm/,eg 0pport your answer wit nvei8,aok6y5/g q 40m zvco9eh an example.

  Suppose that an object is moving with constant acceleration. -t 2f vt*qq7se-w2doyMake a statement concerning its motion2qdw7 *eyotqs2 tfv- - with respect to time.

  Can an object have increasing speed while5 g14f8a53ycztxgrx y its acceleration is decreasing? Support your ans 8 ycyztxg143r5af gx5wer with an example.

  Suppose a can, after an initial kic3 r-uv3rqjb a 1qpe),-lvxr3tk, moves up along a smooth hill of ice. Make a statement concerning its acctj3r3uqr e vl axqb prv-1,)3-eleration.

  Under what condition is average vel(ct *uw5t7k;scj6tc0c l10t) h:k scxab efa9ocity equal to the average of the object's initial and final velocityt acf0wae( 5ckjt*klc:hbt0 96 custs; x71)c?

  Objects A and B both start at rest. They both acceler4)ol(oe,lh8gz+ z :rq*/asv)i7 a crq zfq.uqate at the same rate. However, object A accelerates for:*/l(4,.azei8zq7 zo qsq+ror)a)vg quc f lh 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.3)/ta -nxzsr d However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of objec 3)t ds-r/xanzt B?

  When an object is release71-tl u4er bkkd from rest and falls in the absence of friction, which of thlkret7- u14 bke following is true concerning its motion?

  When an object is released from *dm 3g bzs glyn4m3-7arest and falls in the absence of friction, which of the following is true * 3as ld-yzm3g4g7 nbmconcerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the vel91+tshy/ xe.cn/a.1colxrz bocity and /a osezyhcbxn91c. +l1rt.x /the acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up.z/ +qmpf ;t-ue What is its acceleration just before it reachmp et+uz; fq-/es its highest point?

  Suppose a ball is thrown straight up, rea stpcx+w:* t0pches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity *+s ptw 0tp:xcand acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its 3391iinrh kj5njk3 b2kc+f z linitial height. Make a statement about i93ikn b+3f5 h3jrnk z21ljk cthe direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resi pu 8kgyr 2 dp8w1)p1bsa2hw.qg1zuh8h p 7i/nstance. Make a statement concerning 8zb) daypups/82i kqhh17 8g2 pr1u.hpgn w1wits acceleration.

  Suppose a skydiver jumps from a tl. j7aj +-nmthigh-flying plane. What is her acceleration when she she reaches tetm-+n7 jl. tjarminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball )9vqyj ( ajzw;o43zus is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the o9(vqsjw z 3u;4)ajy zsecond 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 seconinx 2bzc h9+*zd later, ball B is dropped from the same building. As tim*2cb +hx9zz nie progresses, the distance between them

  Ball A is dropped from the top of a building. sz:*8del6c b irvi r)-xat2ppk 8k6k. One second later, ball B is dropped from the same building. As time progresses, the difference in theiri8 tdr:l.cr66 k 8apkek) bx*z 2-isvp speeds

  Two objects are thrown fromlwt ftw5 4 + :d5jze,h8yoytd) the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?h,wl8ed+5jz4ftw5:ytt y )od

  A brick is dropped fromd x a*9lbn2zci -gc-n: the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks -bclngx9din* a:-2z c.

  An object is moving with constant non-zer4f w1m ,+ai.c k;ixiyn-jzv7g o velocity in the +x axis. The position versus time gra-mfjz xii1,aik +.cw ;y4n gv7ph of this object is

  An object is moving with constant non-zero accelerati3 7 1ptx-5rq)t / v(vgzwszaajon in the +x axis. The positionj1w3 sqzp5 )xg-v7ra/azv(tt versus time graph of this object is

  An object is moving with consts h) -+y hi0bjcd.8l:fxcfrlf rbex v:h6e393 ant non-zero velocity in the +x axis. The velocity versus time graphhb x.de9 38r- i ff+hhj:63slbxcyfce0:vlr) of this object is

  An object is moving with constant non-zero accelerationm./ij b*,c8ri p4yabu p7w2ku in the +x axis. The velocity versus time iujb,i7b *y2ucrp/a m4p8.kwgraph of this object is

  The slope of a posit 2p1ibqeqx jq ie kb f:o)pg1in:02iq:m7hb02 ion versus time graph gives

  The slope of a velocite wkjru,ppo ,(i m*(+my versus time graph gives

  The area under a curve in ake3 py7 e1chnfy04b;k n acceleration versus time graph gives

  The area under a curve in a velocity versuhzfh7kxfz-d0 -9r9 xms time graph gives

  If the position versus time graph of an object is a horizontal lioi8 sci1 yso/b) otf8:ne, the object icy osi/so1:8b)8otfis

  If the position versus time graph of an object is dcg+z;,4vf*:rhhvbrr x)a m : a vertical line, the object isb+h vfgzr,:d4 m*;rvh rxc a:)

  If the velocity versus time graph of an object is acl lfd(2 1m4m pxnjm;3 horizontal line, the object i p2mdf (lm mjc;43xln1s

  If the velocity versus time graph of an object is a straidalo7(o k3mx 86ivw m.ght line making an angle of 30 degrees with the time axis, xk6a.im3mvlw 7 8( odothe object is

  An object moves 15.0 m north and then 11.0 m south. Find bothciq+sc b(sf gbei40l; 7 2sd1j the distance travelq+b 0f17cids becs gslj4 2;(ied and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 k4ic8osa n 0eg .y9wc)xu6cg2gm upstream in a river flowing 6)c6sgx gw4 cc8u2e a.ogyn0 9i.0 km/h?

  55 mi/h is how many murex)u++nx pf9s2 h zuzb,31rj jl;s 3/s? (1 mi = 1609 m)

  What must be your average speed in order to ba:gv4 4laqs:15ny/2u pdwp e abb*y6travel 350 km in 5.15 h?

  A runner ran the marathon (ap 9qpzt+nk(s1/;3fs rebz tl6qc1 x r7kproximately 42.0 km) in 2 hours and 57 min. What is the average speed or6b9(zqk3 el7t s1frx;/pct 1k qz+ nsf the runner in m/s?

  A car travels 90 km/h. How long does:;q n bcbqg,,ef 7(adgher/8m*qrra- it take for it to travel 400 km?

  A ly (light year) is thei mz k+j(snv /e2che78 distance that light travels in one year. The speed of lig2ni7 sk v 8+e/cmjz(heht 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 an aw-p;sj*w ,fyd you look to the side for 4.0 s, how far do you travel during this inatte*ws ;a ,yfp-wjntive period?

  If you run a complete loop around an outdoor track (400 m ;yrun-k j9*rc), in 100 s, your average vel*yu ckr j9;nr-ocity is

  A polar bear starts at the North Pole. It travels 1.0 kzngb5zmsn1tzp mf05e*8 h-/ 2pm5v8v(zmm ew m south, then 1.0 km east, then 1.0 km norezf p552/108( -nmb5 sp ewzmvgv*hnm mz8tzmth, 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 south, then 1.0 km easnf*,zuq)e- h slfr/x-t, then 1.0 km north, then 1.0 km west to return to /),fzls*x-e-hunr f qits starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/ bmlwxmr), -dug00u;sh for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far 0m,rbu-xu;ls)mg 0dwis your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 k9 p7+fauvjg /hm/h. What is the average g+u vaf/pj79h speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 wfh-wvo7*piw r,j;n o04: r ajh at 100 km/h. What is her average speed for the tr;f wo w*4ip:jahjv ro7w0-,nrip?

  An airplane travels at 300 mi/h south for 2.00 h and t3y,qzqyv y0 h.hen at 250 mi/h north for 750 miles. What is the average speed for the trihz qy3.yq, vy0p?

  In a 400-m relay race the anchorman (the person who runs the lasggyno2ugcx3.g(- f f,fz6kq0 t 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for tea0xcoq 26.(nyf,fugf gk gzg-3m 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 unifo45 *embq di;eqgcsh*7rmly and comes to a stop after 14 s. The car's average velocity during deceleration was 55 km/h. What was the car's deceleration while slowi;ghqeb5c4e *i*mq d7sng down?

  An airplane increases its speed from 100 m/s l gfw8sa2m m++to 160 m/s, at the average rate of gma 2s wl+8f+m$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at tyhqst-flf*gjr;+(e+ he 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 ps3/lgye. pjs 1s4b5p $4.0 \; m/s^2$ 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 4*f/7,s fteh u isdyf4-b. bvkup with a constant acceleration o */b-kyieff.uss 7v,dhb4t 4ff $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial v8e eob 8lon9:)ixv9gm elocity of 3.6 m/s experiences a constant acceleration ofbmo9 8e)i:evon 9xl8 g $3.7 \; m/s^2$. What is the cart's displacement during the first 4.4 s of its motion?

  A bullet moving horizontally to the right (+x iw4r4(a p2mkl8ym 9zul :g2isdirection) with a speed of 341 m/s strikes a sandbag and penetrates a distany s2i(2:4r4m9agkmlw8z p ilu ce of 82.66 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an m czd-* *1vzhcydbpf 6s kdr0dh-3:n*aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and thi -cd*p3 6- 0 s*hdd:yv*dzfhzmbc1krns requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constag a6r) b2vgo11bwe7h snt 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 ;yqdy.ev (usnm69 u8a its average accelerat dynu9.y8ae qsvum (6;ion?

  An object starts from rest and u*c3gxde0g o1 ( l,v4r4y2 3aibiizim mndergoes uniform acceleration. During the first second it travels 8.1 m. Howa2yg eb*v migid(4x 0ol43 r,i i1m3cz far will it travel during the third second?

  An object is moving in a straight line with constant accelel*i6zhlz p5* wq ;,gibhs6z:zration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move duri6*swl;:ph*6 igbz ,zizlq5 hzng this time?

  A car starts from rest and accelerates uniforg vtpzgs1h/ .u e.bk)+mly 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 cph2bfi h01rn+3cmnd:f ) )t mqan 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 waiting a 4()s1qmqqv5s 9p l1 mvs7 5eybm*dfgat the inter7 4pdv *ev(s1mga ms)915qybf sqmlq5section 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 surface of planet X wheo.r2-4hrthc l /pj /azre the acceleration due to gravity is-/rpzcr .hhao /l24jt $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 1ls;/g/4 po4o4mhzgv h -vkox:2 m/s on the surface of planet X where the acceleration due tohzmghop44sxokl/ovv g;- :4/ 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 surface of planet X slrb6it+05:mlt4gku kz /.svwhere the acceleration due to gravg v5kk/s6b m4+zrlt.li 0:sutity 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// lt -rzmjx1)os on the surface of planet X where the acceleration dr1j/x)loz mt- ue 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.)+okp6 2i/h0 sirscis If your friend holds a ruler between your fingers and releaskc0ris +/o2p s6)hisies 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 9 my9sta m/vj:+4w kvx)ma4sum/s. What is its velocity after 3.00 s:m sk/ +wx49myvt9avj) u4ma s?

  A bullet shot straight up returns to its starting point in 9pcw( qewzimf) t9 w5zy )rn28anb 98r12 s. What is the initial spepz)9r r 5t( nw9anifcqbw8yze2 8m)9wed of the bullet?

  A ball is thrown straight up with t5ubn kz:g 2/c 5msop:vw2qy,a speed of 36.0 m/s. How long does it take to resqubn5/5m: 2z,k :opt v2wycgturn to its starting point?

  A ball is thrown downward from the top of a building with a6ta pqz h(t/4um*b p7nn initial speed of 11 m/s. It strikes the ground after 7.0 s. nb/6m *aptu4z 7hq pt(How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fi+d5emayq*10 rjfh sx93q2nqdll in numerical value in the blanks)xdn+ j2dy5q39m s 1qa0f*rhqe
(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 nd0lp /66-aq0:/jqibetk anr)ok b )l34.4 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 at t = 1.0 d3w( 6d1(u9gddlbx1xnlmqe; s?

  In Fig. below, what is th u2pcga 9sh;2de velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s?t bqv 0a50up-oxh,d+ n

  In Fig. below, what is the velocity at t =q2j 1 uhw/7ptm zc,fqmt(zc8- 5.5 s?

  In Fig. below, what is thy2sm;r4w ln a)e average velocity from 0 to 4.0 s?

  In Fig. below, what is the avera*59m9 3ltek *qked8colt 0z: e tfwvm*ge velocity from 0 to 6.0 s?

  In Fig. below, what is thz+n ev,z17byee mf 0-ae acceleration at 1.0 s?

  In Fig. below, what is the acceleration at wi4sw j b+8mi,3.0 s?

  In Fig. below, what is the average acceleration from3v wm u3,p-rh cv3mf5y 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 ( c+35e7sw o0:ka sri un kyaes;c/ah(s?

  In Fig. below, what is the displacemen zya(1;eyc 5x2ncw, tdt from 0 to 8.0 s?

Does a car speedometer measure speed, velorou vrt 2 5.;g*q( xe2yud;vfoix 0um.city? {speed|velocity}

  An object can have a varying speed p2 a kcl4d);obif its velocity is constant.

  The velocity of an object can be negative when its 6jnm 9k43vuga6)w:1 u qmetqyacceleration is positive.

  If one object has a greater speed than a second object, the first muyp3pcj :f:vkmoc3( x6st have a greater acc3(:jofvx3mkcc 6p :py eleration.

  Two cars emerge side by side from asfslngeqfkx 6-.p2i77up 5/ f 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 acceleration dej2dqh0+a6 wsk9l1w2;g8 m y) dktdpl ncreases.

  A baseball player hits a foul ball straight up into the air. Ii:n m2t4,ieonzzk2.wt leaves the bat with a speed z2i.n: oz,iwkn4tem 2of $120 \; km/h$. 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 it:)gn,wa+x0xdh y qj 1,sne mm,s acceleration, how does itgn) q ,w1amhnx , ,:js0dxmye+ change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerat79l33qo d dnkiion, how does it change if add ol3i39q7kn ir friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its tw /g4-or,s aroriginal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciablsoraw r,4t/-ge, how will this result be altered?

  An object can have zero velocity and n) 9xya9bkphvhi3 3 n2uonzero acceleration at the same time.

  An object can have nonzero velocity and zero accelsc oy p/tv1,t:(z3ndoeration at the same time.

  An elevator moving from the second floor to the x.m tityogh+ pupo3g1,32wz n02o jn 6fifth floor making no stops along the way has zero accelern1 iop uzp0g2,tj2o3gx. 3+o hwy mn6tation all the time.

  A rolling ball moves fromtex x9y :di9q nic.h7s4nno: : $x_1=1.7 \mathrm{~cm}$ to $x_2=-6.4 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.0 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milgt (0dd.yp 2zoe ($1 \; mile = 1609 \; m$) track in a total time of 12.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from.d nq 4h)+z .lq+hyipx its trainer in a straight line, moving 115 m away in 11.1 s. It then turns abruptly a l+p+4hi .y zx.hnq)qdnd 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 8kxoy//4xjr w$13 \; m/s$ to $22 \; m/s$ in 4.8 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 fromn3du:c0f50y-wzcproje:lzc eh * .- s $22 \; m/s$ to rest in a distance of 85 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a o:0eg(v uu id t0:0fdcspeed of $29 \; m/s$ 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 the bl ldhzy8dl2y)athl9icf5, 32 hocks to essentially top speed abouhd2y839yz2f i a,tllhhl5cd)t $11.3 \; m/s$ in the first 11.9 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 gf7ar, s o;7nhof $19 \; m/s$ to rest in 4.42 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leachiwjus3 ax5kp8o1on e+c2)4 ves skid marks 92 m long on the highway. Assuming a decelscx8 +wu2ok5p3 jno4c 1hei)aeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru.fz 7 ,sew d;gep uzjm,uw22:hck 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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. A 4 5 m if2uzvriwg:p0t:j)wz/qfter exactly 27.0 min, there are still 1100 m to:4t ziju 5rz qivwp2g:fw )m/0 go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$