Suppose that an obje6,xgu/n if)gect travels from one point in space to another. Make a comparison between the displacement and t ei,xgu6/n)fg he distance traveled.

  When is the average velocity ot w z8bcvf4p17f an object equal to the instantaneous velocity?

  A new car manufacturer adver1 1/cae+.e q5nv.rhorfq tpb7tises that their car can go "from zero to sixty in 8 s". This othfv/a +nrp cq7e 5. 1qr.be1is a description of

  An object moving in the +x axis experiences an acceleratio+9*rcyb+ferl 9 i3dion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directioq:0 de,eqbzi,y oy) e4n) begins to slow down as it approaches a traffic light. Make a sta zqe), yyoeqd4be:,i0 tement concerning its acceleration.

  Suppose that a car traveling to the West (-x direcpm ok 9:63z hssj)r,j3o cwn,ation) begins to slow down as it approaches a traffic light. Make a statement m rhna 9w6oc,z3 :oj p)3,jsksconcerning its acceleration.

  Suppose that an object is moving with a constant velocity. Ma*di .v-g m:;wsgi.hb yke a statement concerning its acgbmivy-si. : dh.;g*w celeration.

  If the velocity of an object is zero, does it mean that the acceleration if4 4uht 1n:)dnjw-z mis zero? Support your answer with anufw4:mn) 4hijn d-t1z example.

  Can an object's velocity chacmwg(4os s)6w8i 4gqlnge direction when its acceleration is constant? Support your answer with an example. i8sgws44owmqgl (c6)

  Suppose that an object is moving with cowit8cw cvsb0)uqihnf-vd 2 b h*;,u 2 u(;uyk:nstant acceleration. Make a statement concerning its motion with respect to t h (w *2 :i,s8dkvbcwyn-;bu)tu0;uu fhi2cvqime.

  Can an object have increasing speed while it0f y35hg;bq7m*k kdyws acceleration is decreasing? Support your answer wi7dyqw;my 03bk k5 g*hfth an example.

  Suppose a can, after an initial kick, moves up alo-bh3r)xa8cx tng a smooth hill of ice. Make a statement concerning its accec)h38ra tbx-x leration.

  Under what condition is average velocity eq zg7c99x/jzubi-l :tp ual to the average of the object's initial and final veloci9-ilz gj/ 7 9zu:ptbxcty?

  Objects A and B both start at rest. Theambk6xw.a2ge8j2d m8 +b3 zy9vh/z/ mjyz pk9 y both accelerate at the same rate. However, object A accelerates for twice the time as object B. wbembzz 8y26.mvamk ka dhpx y3g //+8jj992zWhat is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They sj7wz81h3+x7hxttc 4j5 g qyl)c,chra g/3siboth accelerate at the same rate. However, object A acceleratecqt rj3 g/a58j 1s h,lthcz3+gcyi sw4x7x7 )hs for twice the time as 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 i wu 1ch3ft*zkx.9b1d vn the absence of friction, which of the following is true concevwh91xcdz b1 kt.u f3*rning its motion?

  When an object is released from rest and falls in the absence o zlyb b 5 wpaq+17.tpr:(w6weof friction, which of the following is true concerning its motion?:+qpz5.1t (lb r6waoypw 7bew

  Suppose a ball is thrown straight up. Make a statemq1*-gib b ocy(ent about the velocity and the acceleration when the ball reaches the hyq1 ib( c*ob-gighest point.

  Suppose a ball is th,nlp) -o89ekizbpre( rown straight up. What is its acceleration just before it reaches its highest nr8o(-9e,lezik pb) ppoint?

  Suppose a ball is thrown straight up, reaches a maximum height, thenz)+bjwc gi8 ( :ft;s*msspv n5 falls to its initial height. Make a statement about the direction of the velocity and acceleratiob js gcivn;(m f8 s:pwz5t+*s)n as the ball is going up.

  A ball is thrown straighvc, cs: e-3)0y9wh mvybf aa,p+xo4zlt up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of :, mawl-vba4+oy0xs 3e h z fp)cyc,9vthe velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of au.ohqtxm/j1s5 f) tb 1ir resistance. Make a statement concerning its accelerationb1fo5s1jqth./ x m) ut.

  Suppose a skydiver jumps from u,y99qsiun t( a high-flying plane. What is her acceleration when she she reaches terminal vel,s9ui(q yunt9 ocity?

  A ball is thrown verticalpv(p.6x rctex hj86 z9ly upward with a speed 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 s 6v .jetxpxrh(p9cz 86econd 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.1mf 1q0:pnz,kx79ah lnfsqv 5b/ln8i One second later, ball B is dropped from the same building. A 0,nn:p b 51mqi/z1v xhaklnq7lfsf89s time progresses, the distance between them

  Ball A is dropped from the top of a build * 7fqr w3kmth4ju0 w9rsi;uf gz70xo7ing. One second later, ball B is dropped from the sam u fxrik079sqjfmhur7w7;34z*g o0twe building. As time progresses, the difference in their speeds

  Two objects are throwq6gxxb i.pqh l+7 4y5rn from the top of a tall building. One is thrown up, and the other is throw yr x 7h4xg5qpl+.ib6qn 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 second brick is thrown straiofzzi(2* ll.tght down from the same building. They are released at thetll.zz 2(ifo* same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Th8xnhfwr) lqk 11g;w1ijc* t8 ls9fb7te position versus time rfwb8wic9kx)j1ts7flq *;g 1 h1nt8 l graph of this object is

  An object is moving with constant non-zero acceleration in the +lz(+v4(l lohwum f4 k/x axis. The position versus time graph of k(/ vf( +ulw4zllhm4o this object is

  An object is moving with constant non-zero velocity in the +x axis. The veloc; 2u glinr.u2o(u. emcity versus time ;.lgr(ie c2uu .mnu 2ograph of this object is

  An object is moving with constant non-zero acceleration in the +x j y7os mp.c(09p, ; vxry )k/l7rg.nzfgpx-nm axis. The velocitypg mpg nl;fsx7 ,yc /nrxzj. m0(9)vykpr-o.7 versus time graph of this object is

  The slope of a position versust5bj- mv+w r/g 0i.dte time graph gives

  The slope of a velocity versus time graph gi z+pcdzy ho.cp* +u,*i6. xlxlves

  The area under a curve in an accel y+druws 5j9b3bgp4 c-if.ibnnm8(j4 eration versus time graph gives

  The area under a curve in a wzhv2e;8 cj0 xdrt0zhz+n.0e velocity versus time graph gives

  If the position versus time graph s dc lp/n::-abv4b0ng8 )hptj/nyiap u 47lb:of an object is a horizontal line, the object is tb4 )i hdnvyupp/ps8:: b4/a7agjnc b0l l:n-

  If the position versus time graph of an hbm r.rtz)xs9 lnnj00;wh, q,object is a vertical line, the object isrjl0;n9qr zh.wbn x) ms0h,t ,

  If the velocity versus time graph of an objec u x v ugut/77;z42psyah6.jhys2b4ae t is a horizontal line, the object i2 jvxs. p u64g4a ty2ub;uz/hya7h7ses

  If the velocity versus time lpm :xjut,g n j,f3u3,graph of an object is a straight line making an angle of 30 degrees um, pf ,jgxt ,33jnul:with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distanctva/2o92 emj se traveled and tj2aet/ sm v2o9he magnitude of the displacement vector.

  A boat can move at 30 km/mw2kz7 goft,8njc.cg3 x7do7h in still water. How long will it take to move 12 km upf z2 om8.d77ng 7gkcxj3wc,tostream in a river flowing 6.0 km/h?

  55 mi/h is how many mgmingt 57o-kmw1 bq/ zbxpv 0)9t)bk9/s? (1 mi = 1609 m)

  What must be your avfz*x on* jwb3qz4+7zcerage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 vlfoko)j+,)x52h ai nmin. What is the average speed of the runnh 5xlnko)vfaj, +2)io er in m/s?

  A car travels 90 km/h. How long does it take for it th1wmi/0j95pz. ;zrh ykoiyj+ o travel 400 km?

  A ly (light year) is the distance that light trazhtehf e*gxtmdm. yd74 m6.t,4k- 7kqvels in one year. The speed of light is6y 4t m7x7hh,dtte.kkm4gez*fq-m .d $3.00 \times 10^8 \; m/s$. 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 y:d*kpu :aqa z,ou look to the side for 4.0 s, how far do you travel during this inattentive perioup :d,q ka*za:d?

  If you run a complete loop around an outdoor traf g65he;ux/ eeck (400 m), in 100 s, your averae5f; euxh/6 gege velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0af3dw:wz9cp e)d- 6/ z hh/;oic8xp dm km eas9) cz/a6hho;/ifd d cp8wm-xzp 3d:ewt, then 1.0 km north, 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 Pm ghl,w(x3 zdz6ih.t;b)mu q 0ole. 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 wasm.x3 ,wd)bhi0h;mz6lg (quzt the bear's average velocity?

  You are driving home on a weekend -s -btqsoly8:from 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 h:l-qs s oyt-8bours and 15 minutes. How far is your hometown from school?

  A motorist travels 1os-ysl8u5m+zccs:9wq uw.xi13z* e p0;i swy60 km at 80 km/h and 160 km at 100 km/h. What is the average spew5p:ms.uyww 0 +8sci; zi q*o lu3sxzc1s9e y-ed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What ishl uv7rfp)th gv-e*x63as /a0 her averp3- 0tv g6h)r/aavf 7h*euxlsage speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and thelk2.0 wrpsd-.vq-/g q r(w tmnn at 250 mi/h north for 750 miles. What is the averaw(ls/p0mn qwrkdrv2.--qg. tge speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for tl1wuoc:i74 - ;ozfx1 -2zypnmfoo2ypeam A can run 100 m in 9.8 s. His rival, the ancmpcf 4:-y72z1 wi-2lonf u xoy1o;o zphorman 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 uniformly and comes to a stop sfne+zwj 6:9tafter 9 s. The car's average velocity during deceleration was 63 km/h. What was the car's deceleration while n6:ztfs+w9e jslowing down?

  An airplane increases its speedvsr9-s sj19w,b v ej2w from 100 m/s to 160 m/s, at the average rate of 12jvjww9v 9r b es,s-s$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerat127+9s25jtn 5jj5p;s iq afftjjkz sx es 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 accele+k2ctswo h:soak //1frates 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 with0 atgrjgh5wgr/78 axb (es),x a constant acceleration of g(7rag xwht8,xsr) /0bejg5 a$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity o.)rm7e :,bzkui;c6uoushu;z f 3.9 m/s experiences a constant acceleration o u6s.c ebmz7o u;);uhi ur,k:zf $3.5 \; m/s^2$. What is the cart's displacement during the first 5.9 s of its motion?

  A bullet moving horizontally to the right (+3 k2cmot*rq tz(7xr)6 .ujsxlx direction) with a speed of 249 m/s strikes a sandbag and penetrates a d2q(rsou k j)7xxl*z.m6 ttr c3istance of 68.29 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is lh-wvq ;:oh6 qw+1sh94 e frebmaunched 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, what is the length of the cat-9bh6 w;qvs+h1r q feo:4 hmweapult?

  A car starting from rest moves with constant acceleratio5k b .dfe3noab-6.c3i (b. ycyt:ols ln 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 distq 8s; ,:mpcairance of 200 m. What is its average acceleratiqrm,8pa:s ;cion?

  An object starts from rest and e 3:mvi:0 yylnundergoes uniform acceleration. During the firstmy0:: 3enlviy second it travels 2.1 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initially it7wv q+qj*vwbky.ba g:. ax+d2 is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during thwq 2+xyqba *gjd.+v.ab: kw7 vis time?

  A car starts from rest and as;g) n2pz6yth s tk u/e2ih3*pccelerates 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 : 7bulqzrkamp 06zl9oth 1l19at 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 car2mtj0h wz :k4q qj);zk that has been waiting at the i k :z4mq)kzqjthw;02jntersection 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 plankdqog)y g w3,m13 sw(ket X where the acceleration due to gravimw3g3sdk) go1wq(,ykty 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 surfagm;y p,(y6 klnlw:b.p xceo2. ce of planet X where the 6;lpeclm.(x y,. w y:bp2onk gacceleration 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 o5qc;mk,q4f9;tg4go 4pyd d q bn the surface of planet X where the acceleration duqptdqgcgbf q;m44kd,;5 y o49e 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 plao ( k)4lygu-7ui ;teywnet X where the acceleratiw4igkey )l u;7 yo(-tuon 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 friend holds c84akk1y+rau a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall aa1+4ru yk c8kbefore you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3d mblbn-9l1e*(ges0 wtw2 q( w.00 wt(*gbwe 12( lemb-0q9d lswns?

  A bullet shot straight up returns to its starting point in 10 s. What is f 8h++7ejv t.j yboqk)the initi+7htybjf8ekj o )q .+val speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it takerl;cdo*:v aa: to reto:ar l*; ac:vdurn to its starting point?

  A ball is thrown down e.*;yrje1f dyward from the top of a building with an initial speed of 20ed.j yr y*e;f1 m/s. It strikes the ground after 4.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical m-hxga /m)oz yr76g6g value in th)6g6 z oy rmamg-hx7/ge 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 spwp;u r;uv.osm*(mu g(eed of 32.0 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at tduzp667mi.81t+olf h o 0tuox = 1.0 s?

  In Fig. below, what is the velocity at ttktt1 ltu,w 0:z4wvl6 -zrpg2 = 2.5 s?

  In Fig. below, what is the velocity at t = 4.x0* )veo rgbg r2jyslp4d)m:(0 s?

  In Fig. below, what is the veyx5 (+4a,w+-eosj sw;iu y krvlocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s2.odpoaccru )zv2qwb 7.4l7w ?

  In Fig. below, what ic+6sd 7ri fnsppz2+h8 vh8d6 ws the average velocity from 0 to 6.0 s?

  In Fig. below, what is thez 4fu *d15anst acceleration at 1.0 s?

  In Fig. below, what is the xys5vv+1l n :/psa5nsacceleration at 3.0 s?

  In Fig. below, what is5cs*c;i oc ivof*46kt the average acceleration from 0 to 5.0 s?

  In Fig. below, what inl*a u1m4, 0aaz pp*cms the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displad:u q od,h1-accement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|vellfuj*7 z.-/pot d gps7ocity}

  An object can have a varying speed if its v4,kabc1 lti40;n3tjl h+ mhw qelocity is constant.

  The velocity of an object can be negative when it+kwaa-z+qi: r/ :ypil s acceleration is positive.

  If one object has a greater speed than a secon4yxfodu6vd. k e-+xp50lbwr +d object, the first must have a greater acceld+ w0fp64o .xvy-u kxr+eldb5eration.

  Two cars emerge side by side fro/vwsx*r *0(6 zgnekx,-udapu) ) kfaum 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 increasi )tvl;h1v v*2usu t)cih*mls)ng in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It le/9( 6t4 mrujuf8cmnvhaves the bat with mm h8jn6(/uvr9tf4c ua 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 acceleration,6lf2b+t lxdlc2a 8:0x4zltnsu 6 /ef l how does it change if air friction is ignorednd0txz6l6fbl e:2as c ll f+u2xt84/l?

  As a freely falling object speeds up, w3; )x5)v ojsoypdrxt; hat is happening to its acceleration, how does it change if air friction CAo )j)5pt3v ;osx ;yrdxN NOT be ignored?

  An object that is thrown vertically upward will return to its original auu90y ca 67a:gu3rt) uq,tasposition with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this ry9su:ugt0,cq7 a rta6a )au3uesult be altered?

  An object can have zero velocity andnxfkmyzi.6, y(c ( 3gu nonzero acceleration at the same time.

  An object can have nonzero velocity u p z/eok1o8j3and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops alonbci yz*l7 /5mig the way has zero acceleration a/*ibmz 7i5yclll the time.

  A rolling ball moves f9qrc gpf:l h(-qvt2z+ ecn)6 arom $x_1=2.3 \mathrm{~cm}$ to $x_2=-4.5 \mathrm{~cm}$ 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 $t_1=-2.6 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a5 yboc0,rvh: ground a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.1 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 lt+sqc u l61awbk (5ym1ine, moving 104 m away in 13.7 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a)ys+b5qm1(k6aw1 l tuc 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 froj i(e(ikpn9r ;m $11 \; m/s$ to $22 \; m/s$ in 5.2 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 f2-dg8bjb8xr4whj 8hm8 uv8w$23 \; m/s$ to rest in a distance of 81 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacb -q yb(jaynuz1b 60dn*n:7h 6n1b2um bzpxo+h a speed of $27 \; m/s$ 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 essentially top speed an(u8wsu9 r0ovzh2fo) bouts9ru o v82uwz0 h)fn(o $10.6 \; m/s$ in the first 11.5 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 unie.wqiat-7.o 0 ctfw pih )7,dhformly from a speed of $16 \; m/s$ to rest in 4.89 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 hi b5+ -rfpx4c n)rs nzw.9phe)cghway. Assuming a decz9-hnbws.n 5 pccr4e)px )+f releration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goinga6ow hr -61 m2qwh1 eax/0gcd)8b enwc $25 \; m/s$ 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. Afwzz)n 5qlm. a6zoug.ec0 z 06ater exactly 27.0 min, there are still 1100 m tz0law60cagem q z)5zu 6 o.zn.o go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$