Suppose that an object travels from one point in space to another rxz*0-qxm up 5bghg*0. Make a comparison between the displacement and hm*bpur 0g* xg-qz0x5the distance traveled.

  When is the average velocity of an object equa w;/mju5 njc1wl to the instantaneous velocity?

  A new car manufacturer advertises r6p3 dwl; uij,that their car can go "from zero to sixty in 8 s". This is a description p 6ilw3jrud,; of

  An object moving in the +x axis experies8rbd2a ,*e bfnces 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 dowc6 85lx4il8s jx xfd*ln as it fx *l46 xl8d xslc8ij5approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direb4evz-y)zwzdl 6v2qk (h,7ggction) begins to slow down as itv2,g)(-7 q6 ekzyvblz gzwd4h approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant veloci nvdax ))d2nwd)d7 5b jt:2ohyty. Make a statement concerning its accelerationd h w)yo)d5:jnvdxn2) 7b2 adt.

  If the velocity of an object is zero, docez)x l(v(b1k73e(+ blatmv ses it mean that the acceleration is zero? Support +b3)z7(ks((vellb t1 cea mvx your answer with an example.

  Can an object's velocity change direction wht3+y auwns d7,en its acceleration is constant? Support your answer with an exampl,d nu+ty3s wa7e.

  Suppose that an object is moving with constant acceleratiouori30la. x6an. Make a statement concerning it aau.lixr0o63 s motion with respect to time.

  Can an object have increasdelk d) 52z3oxing speed while its acceleration is decreasing? Support your answer withedd xol325z )k an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ices1 /wxw6pih1z -ndyajys 0j ;5oim 3)g. Make a statement concerning is3 5o/wn6i; jp- axz)1ydhg 1iysmw j0ts acceleration.

  Under what condition is average ve zt,0;hm.iy1svq j4az2+l dfb locity equal to the average of the object's initial and final velocity?t4y z,f2b.a j;lhv1qd s0m+iz

  Objects A and B both start at rest. They both accelerate at tht .rb(s0crm9jb/ ylm 6e same rate. However, object A accelerates for twice the time as object B. What is the 9sm 0.ry rm lbcj(b6/tfinal speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rm/kfs4ciw , 4 b*f3i7t +adwq(ic2teu .i,zesate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of 74tcw4smz*f,/uistiai qdk2. 3ewfbce,(i+object B?

  When an object is released from rest and falls in the absence of oqo.76v9 ,y s9pjwdr afriction, which of the following is true ca, vpydor6 w9os 7j.q9oncerning its motion?

  When an object is released from rest and falls in(uwz e 8 z7./1qfpnt/quj-xsr the absence of friction, which of the following is tru8(qx1uj r. qu/zs/p 7e-fwztne concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and ) i/jl k+uogatqh :zc d7g(i5)the acceleration when the j5lq gkoa g)t d(:h +iiuc7)/zball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleratien ;+x3*)l4wrkg/1mhsx 4 xcvykxa8 ion just before it reaches its highes1ki+x8 )*lgynarx hxk/ s3vcw 4m4e x;t point?

  Suppose a ball is thrown straight up, rev5;+udtvdd3h kgy v 4cct: 6 -ze5w2lms .ib2raches a maximum height, then falls to its initial hdw352245i; t-yvehd.6g:sz vldtcu c m+ v rbkeight. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reac4gkfmt1 nu *bp-a d3r)hes a maximum height, then falls to its initial height. Make a sa p1dfg3 nt*r-u )4bmktatement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of au jly(khrzh*9; mc*r4 ir resistance. Make a statement concerning its acce;klr j zh 4y*hcmru9*(leration.

  Suppose a skydiver jumps from a high-flying p+ bn*xj7nz5c*4krd8ouvj; 2dhrfdk 2lane. What is her acceleration when she she reaches terminal velovo5*2 +c7nudr 8z2 xd;h4jdk*rjb fkncity?

  A ball is thrown vertically upward with a speed v. An identic t:by8) 13 yvirumbvk+ 0twspyjek8)6 al 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 fir k:k)1jp) tv+vye 8m6uytbw830i bsyrst 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 second latezd5km+ ,2tt;mcci be n qqwa5y*q/v*vclw;8*r, ball B is dropped from the same building. As time progrev8 et vylwcdkcc,tn wm25a*b*m ;q;*i q+ /q5zsses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball ip)lfg* pvjl-,e j*iwp g0)l2 B is dropped from the same building. l wg) 20*fijplvj,g)-lp p ie* As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, annybhb4qz k9gq5v:8 *m d the other is thrown down, b *b 4myq5n9zh8bqkgv :oth 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 bjs; ,6qgo6 l 0zknkv,888dxp.hvtv zyrick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acceleratx. g6vt ,q0o,6yh ; zvks88zpvd8lknjions of the two bricks.

  An object is moving with constant,)yr2ad kk6n u0jo4so non-zero velocity in the +x axis. The position versus time graph of this object isu k0koy,4d r ns)2aoj6

  An object is moving with cons*x7idp8qgj zk +gwg .5tant non-zero acceleration in the +x axis. The position versus time graph of this w+kg7 5qgp8.xz *idgjobject is

  An object is moving with constantmkflp.p b6xvk6zhb 6 30p --tk non-zero velocity in the +x axis. The velocity versus time graph o66p3mh-bt.v0 xp -kzkl6pf bk f this object is

  An object is moving with constant non-zero acceleration in the +x axis. The vfii*8 29tgj icp619: jm;jl6b onefnlelocity versus time graph of thisim1fcnf98il6oijgjn j;l t26ep *9b: object is

  The slope of a position versus timqt u1 /,i;fme hjqn/q1e graph gives

  The slope of a velocity c pht pxm,81n7versus time graph gives

  The area under a curve in an acceleration versus time grap73hev 6 mt- hl9lg9ombh gives

  The area under a curve in apd0e,+* f )ff73cx iuelbk-yx velocity versus time graph gives

  If the position versus time gry t*rwjtn9e;/eb(n5t aph of an object is a horizontal line, the object i( r;9nw5ntbtte *y /ejs

  If the position versus time grapyl86 6tvmc 7pj (gq,ebh of an object is a vertical line, the object iscj6gypl e(b6 ,78mtq v

  If the velocity versus time graph of an o v3 r+p clscf5 i. (wspnjd,-h4hi9r4ibject is a horizontal line, the object 34i hrcn-9iiwrs5. l h(, +4vdjfcsppis

  If the velocity versus time graph of an object is a straight line makin gsarmeo9qswr*oa5gi /30 +)tg an angle of 30 degrs or wo /5*ate9qg+0s)a3rmig ees with the time axis, the object is

  An object moves 15.0 m north and t e;:.z8fah kvdhen 11.0 m south. Find both the distance traveled and the magnitudhd ;ef zkva.8:e of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to mov387k//8gaiip b t4v5sh u erbve 12 km upstream i/tb5b3v i/87ia urevh4kps 8gn a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (o vb5vgi yviere)h4:5r3 0al51 mi = 1609 m)

  What must be your average oj26* tklfcog 4(9aymspeed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 a7okkks67amcm1 + +hj min. What is the avmk sakhmoa 7k++617 cjerage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel(knmsv1 8 ozz+ 400 km?

  A ly (light year) is the distance that light travels in one year. The sp+0gy9 cga/ay p)a d7vpeed of l/+a7yydap 9a0 )cvpggight 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 and you look to .:a(fr(:p b6a mbyafothe side for 4.0 s, how far do you travel during this inattentive perio.ya(r(p abf::om fb6ad?

  If you run a complete loop around an outdoor track (400 m), in 100 s, ydf zycmr6z/*-our average r-cz*6 z fy/dmvelocity is

  A polar bear starts at the North Pole. It travels 1.0 km soutkosi;x6c mezq;2 a c(5h, 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 thee(i 2ko;5 sac6 zxqc;m bear's average speed?

  A polar bear starts at the Nogu)z5zs u+vib*h,l l4rth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west 45ib zzl+sh vguu*l) ,to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend frov r;-63msyfxx c5du.4 lx5wd rdj: 4vvm school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You ar 4x- u5sflyw5:v;6d vcvd 4x mrr.jdx3rive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the ave1 f)vr d+epqr-rage speed qv)e+r1 -fprd 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 is her ave4c+lmbs ny,0wky1wcj..ac. k rage splwk.b4 s0c ma.w1y+yccnk ,j. eed for the trip?

  An airplane travels at 3yeu 7nwokd. ep2no kk6+of(4/00 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. W.4ko(wno/y p6n7eku fo2k d +ehat is the average speed for the trip?

  In a 400-m relay race the anchorman (thu - mtsp:c +ren8f64sde 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 coversfmp:de crt8+6 s4u-n 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 after 13 s. The cac42cn 7ao0lzur's average velocity during deceleratio74 ulncz2a 0ocn was 34 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 mhyq3 efib7n :rhe/am8xs8z3 sqo:o; , /s, at the average rate of obz8f:a x3m h: 7q;ies3 s/8,eryq hon$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kmp*e92qa )iuasm dz9p0/h accelerates 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 resxk*j fzzo/ pv /yig ku.88pa.,t and accelerates 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 znd .hbe/k 8vz9*cvz)s. It then speeds up with a constant acceleration of9dhk *cvz zv8/zbn). e $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.4 m/s experiences a cop4;p chhjgqr)l14u64ibu 7 /j pjkg) vnstant acceleration of u;hpj4p6r 4i gcjuqpg)/7vbhj4)k1l $1.8 \; m/s^2$. What is the cart's displacement during the first 6.6 s of its motion?

  A bullet moving horizontally tz9h kz,3l t5aejckpvkyw06fa: zv*pmh:d 7 78o the right (+x direction) with a speed of 287 m/s strikes a sand3z:a7f *v hm ypz85 cjw9h, ltv6zp7a0dkekk:bag and penetrates a distance of 49.79 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched frqlwiqy9:6f4vgo,9xz.o gu 1 som 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 len4:zox w 1o. q ,6igl9vs9gyufqgth of the catapult?

  A car starting from rest moves with constant acceleration of*sox dd 1-soj8 $2.0 \; m/s^2$ 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 : np6sls sbevt97y51b80 m/s in a distance of 200 m. What is its average accelerationy9ts 17bpblv6s5e:ns?

  An object starts from rsam(q ;ryn1h *est and undergoes uniform acceleration. During the first second it travels 5.5 m. How far will it travel duh;rmqnys(a *1ring the third second?

  An object is moving in a straight line with constant acceleration. Initially/itu1bw x0.sk*b i*)k rrrg p2 it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this r xb*.turkk1)ps bigrwi/02* time?

  A car starts from rest and accelerates uniformly atm1+ubm .pux cq96ik*os8:jjg3s(zu h x6c b ,t $3.0 \; m/s^2$. 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 r 1/ff.plx xkebuv0gm w0t *x14oad 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 hasg (ht wknph uz,i3h9r *h-r47f been waiting at the intersection starts ahezwhhfngh4 *93 (pu 7 -htirk,rad 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 whe19tcw)sesq3 ik jhj-d1k(r4t re the acceleration due to gravity isct4tikhr)e(3 wq9 dkj1s1sj- $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on was8+llnqz5g1 w*ng 8 the surface of planet X where the acceleration due t+8n sl*w ln85wzqgag1o 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 s 3nju5ym2)o nwith a speed of 15 m/s on the surface of planet X where the accn3onuyjs ) 25meleration 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 w;ze n:2k l0vjqll 0b;a speed of 14 m/s on the surface of planet X where the acceleration due to grave2 :k lbwn0lvq;z l0;jity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time i+z1lga6) dcdns usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning,1)6 ag dc+dlzn 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 iso58 /d*pazdj/vu n7zh its velocity after 3.00 s/d7z 8vujd hz5/*opna ?

  A bullet shot straight up returns to its starting point in 12 s. What .qgz by- 3y/(g/kkyu85hrobi 6pr (cb is the initial speed of the bo y(/-kz6 qhu.5ib 3krbybr gc8 /gp(yullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long d)c0bh8 xyep,x:(tb pj oes it take to return to its starting x,py8c(p bex)j:t0hb point?

  A ball is thrown downward from tuo,;ojy z/0bakim qrp7dcgk,y/ ++jsm*p ,w7he top of a building with an initial speed of 17 m/s. It strikes the ground after 1 yygokmz+,p,bs /jm7aqwo+7d/* u pk,0;ijcr.8 s. How high is the building?

  A ball is thrown straight up with a speedhl1(y1i:p ivhx+0 zzw of 30 m/s. (only fill in numerical value in the blayhli x zw0+ i1:h1(zvpnks)
(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 the07 ctar* ,i bmak;(tr- rybwg8 air with a speed of 22.1 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 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 velocity nmqmcqz0 pm1 e* ;;k)3g4pdxb at t = 1.0 s?

  In Fig. below, what is the velocity at t = 8; h5bmt7/,p la uktsi2.5 s?

  In Fig. below, what is the velocity at t = 4.4oc a8xg 5tag80 s?

  In Fig. below, what is the velx+1qq o 9h*c: rfonwmk58w d1bzq:m,1lbezw7ocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 7ylechez l(w:pt9 )i0 s?

  In Fig. below, what is the averagxfb9ok1p *3 7g ucn,w)a6zz kke velocity from 0 to 6.0 s?

  In Fig. below, what is th88mcy 6bf gyy kty686+;bnx pze acceleration at 1.0 s?

  In Fig. below, what is the d: )d:5 ;z3af ovbiwx2aqo )dlacceleration at 3.0 s?

  In Fig. below, what is thpqv hd7-8j3 kjqcx3x(e average acceleration from 0 to 5.0 s?

  In Fig. below, what is thehg yp;*q*+p qco2 ec5b average acceleration from 0 to 8.0 s?

  In Fig. below, what isn12 tb wsz4y0(bomy1 o the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velts, 2 dm/jrm7tk.na( focity}

  An object can have a varying speed if its etz3 1+nkron4 velocity is constant.

  The velocity of an object can be negative when its acceleration is posie (ccb(u s79tmtive.

  If one object has a greater speed than a second object uwmhe5*j,a 0s, the first must have a greater accelerati ms,weu0*j 5ahon.

  Two cars emerge side by side from a tunnel.s mq; ;/h,g1tsg0idzc 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 ,b 3 bze3opoc:acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat xl58qk e2,r3clv +wbbp(vb y/ with a speede 5, 2vcb38wxk y+lp/vlbb qr( 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 ou6pf 4xqz .xy4bject speeds up, what is happening to its acceleration, how does it change if air fricti x4uqfy4p6z.xon is ignored?

  As a freely falling object speeds up, what is happe)6rg 0c zxtkua1c7j ,bning to its acceleration, how does it change if air friction CAN NOT be ignotccjuarbg) 1,06xz7kred?

  An object that is thrown vertically upwar)o(x) qao,cqzfa9 (fg 2nwng-d will return to its original position with the same speed as it had initially if air resiso,gc fwa(n - q(na)f)ozg9x2q tance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the samef pn 4 ght(/rm5j.i/hh time.

  An object can have nonzero velocgm p32z;rzlu5y8zu 5 1j-:prf8b rhkaity and zero acceleration at the same time.

  An elevator moving from th9golzl .,8s:ioj7ja t6 gn*jday5va6e second floor to the fifth floor making no stops along the wz. dlv no 6ggasi,al*5jaj98: to7jy6ay has zero acceleration all the time.

  A rolling ball moves fn2 ruvl/, ti 5r8 qdpp45wr,y m8nmh:from $x_1=3.4 \mathrm{~cm}$ to $x_2=-7.9 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps y k2vc5 ,m+ ifq(eec1yaround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.8 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 strjo ivndjnc.l) o121o hk(e*s7 zl6ql ,aight line, moving 96 m away in 8.8 s. It then turns abruptly and gallops halfway back zq c6)jvl k,7i.ol(o 2oeljndhn* 11sin 4.5 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 frokio4vr )ikf+.g/gcz 8m $13 \; m/s$ to $24 \; m/s$ in 4.5 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 frocd .no.jj* 3qtm $15 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a h l4ebnf9k3h5 ( e k(97erdjsyic0cu3 speed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the bloi5ezdll .s2gxf2x )qp4j*m:ap wjr))cks to essentially top speed aboutz)a pfpl:*r.dxl)ij5 4jg2qswe2)x m $10.4 \; m/s$ in the first 14.4 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 uniforly:n:y+gxk )r +q)cnx mly from a speed of $18 \; m/s$ to rest in 5.29 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 highway. Assuming kxfpa + 9jx,tj-mn8zvo)-a/ a a deceleratij)apj 9am8t,z+v-/- x oxna kfon of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goins7x imedb 5aaa1i6tma qzp-:wj0/t 9 0g $25 \; m/s$ 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 lec881zqg + lzqi1,zukb ss than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The,glc z8+bzi1k qu qz18 runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$