Suppose that an object travels from one qo8ywir:qa .63r* rdkpoint in space to another. Make a compaq83 6wr .*rod yrqka:irison between the displacement and the distance traveled.

  When is the average velocity of an object equ-hu,nu fiu9( 7rpxkn* al to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zeroyc wo lnqp/jiv6-)2+o to sixty in 8 s". This i)qwl - pi+o nc6y2j/ovs a description of

  An object moving in the +x axisy c vurtwb:tg.*7 t5s/ 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 4s6(7kkfst : rdcm z;gslow down as it(trk;:6s scdzm k74fg approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the 7yuhykb wi;+ ihk(r;f3 (xjc-West (-x direction) begins to slow down as it approaches a tr hk +y-wiu(h7f c;x 3;(kibyrjaffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a s7ezq3vsbwfo f ,k pd3p.a .8aoez*k69 tatement concernip.z *p9fbf.w8 vk,3aqoaeos6 k7ez 3 dng its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zepc83 yl-1m10 symiv awro? Support your answer 3 am 8ylwv -11ys0cmpiwith an example.

  Can an object's velocity x+ ne way);l-schange direction when its acceleration is constant? Supportxywe- ) l+sna; your answer with an example.

  Suppose that an object is moving with con-yos -py3m mp5stant acceleration. Make a statement cmyp-p3ms5o - yoncerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decr3ym p ksq 3bpjc*l0-p:easing? Support your answer with an example.pb mp y3cj3-kq0: *lps

  Suppose a can, after an initial k4c4byhtqb:l - i,yk -uick, moves up along a smooth hill of ice. Make a statement concerning iqbhy4t4 : c,i ukly-b-ts acceleration.

  Under what condition is avqqk(ahx+ nx7m. ykzwn j) ,*gnxjb 3 ia2d162oerage velocity equal to the average of the object's initial and final velocn*w 2kq2nyqm iox1 ,)kxgb.j nah7a6+ (j3dzxity?

  Objects A and B both start at rest. They both accelerat12t ghc+zo*l re at the same rate. However, object A accelerates for twice the tiro c2+h1tzl*g me as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start fromk6v.;pv +tvov7abses 2, c kd6 rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by tve ;bv+.oksd 6,p 6kas2v7vcobject A compared to that of object B?

  When an object is released from rest and falls in the absence of frictio *j z+(gcsf;gu+; stgfn, which of the following is true concerning iu*g;ff ;gsc +sg+t(jzts motion?

  When an object is released from rest and falls in the absence of friction, 7dz 8o/f5n:ns.ibj le which of the following is true f5/ 8:lnejz7.dobin sconcerning its motion?

  Suppose a ball is thrown straight up. Mar w.p(ckbal 2pt4( oz5ke a statement about the velocity and the acceleration when the ball reache2(rt kl .(wzpacp4b o5s the highest point.

  Suppose a ball is thrown straight up. What is its acceleration justq7br l w iept8(-aoi/; before it reaches its epia;7l8-/owqt ib r( highest point?

  Suppose a ball is throw i6avt u:8if6jn straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direu f6ij 6v:8iatction of the velocity and acceleration as the ball is going up.

  A ball is thrown straighw0mn)eq9h :0a7tuvdn p:u( e ht up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelenh : 97wepqdtn hm0e v:0)(uuaration as the ball is coming down.

  Suppose a ball is thrown downward in the q 7 f7n8ufv c.o9 ivt0h4*fvinabsence of air resistance. Make a statement concernin 7uviqt 7ff*f0iv.8 cnho49vng its acceleration.

  Suppose a skydiver jumps fx: weozu fq t3q 21-0wqd.uyj8rom a high-flying plane. What is her acceleration when she she reacheqq 31t0uwuf8d :2 ew.-oxy zqjs terminal velocity?

  A ball is thrown vertically upjg*m9 ln9 qla;ward with a speed v. An identical second ball is thrown upward with a speed 2vl; a9mn 9l*jgq (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a * vmhcd0(ceb t9j52p ubuilding. One second later, ball B is dropped from the same building. As time progresses, the distance betw d *( vupcj2b0h59tmeceen them

  Ball A is dropped from the top of a building. One second later, ball B b* kvyzi3c/dhhes1 xcuk/., 7is dropped from the 7ishhk*kv/3, xdcbzy / .1eucsame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and 8ra 6rhj5jwp psbp-)l0 m5sv(the other is thrown down, both with the same initial speed. What are their0mh p58)6wpps a-lj(rbrsj v5 speeds when they hit the street?

  A brick is dropped from the top of a building. A second bricklmbfp7bfzbh6 qgt5-m((l6u9 p kl4- j is thrown straight downlku( qj5 fm-l7f49p6 b lt-b mpgh(z6b from the same building. They are released at the 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. The6rg.w ne52lo ip6dwi- *hxbr 5 position versus2d5e*ig5xplnr6w-bow6 rih . time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. 00k0bjzn-tti The positk0j ib0nzt-0t ion versus time graph of this object is

  An object is moving with constant non-zero veloc. ,cwird:x6r:-)7e mc6d2rgg yhofhsity in the +x axis. The velocity versus time graph of this object if s .h rhc,i):2 rmg -xe76:6ddycgorws

  An object is moving with constant non-zero acceleration in the +x5.n 3.z j q9yneex1,vl akm0el axis. The velocit1 lne, 9xy 3lveqk.j.anzm0e5 y versus time graph of this object is

  The slope of a position ) :r4r.ohcav e5eya3z versus time graph gives

  The slope of a velocity versus gt80 bck*3sqrtime graph gives

  The area under a curve 5fu50 t qzfzcu, nb570 )qlyxsin an acceleration versus time graph gives

  The area under a curve in a velocity versus timebn,:wf0. i8ekv0 r+c dbdx7s o graph gives

  If the position versus time graph of an oz, n hoz9 2. j-teo*jtujkl+h*bject is a horizontal line, the object +*zoljjt nukjh92oe,t*hz-.is

  If the position versus tim4tlsc0*5d +q7bnb 8lu, iofis e graph of an object is a vertical line, the object is4,cllbt85nq +s is ou*7 0bidf

  If the velocity versus time graph of an object is a horizontal line, tvy nvh-(64 f46uspcbkhe object i ( 4y46ucvvksh6npfb-s

  If the velocity versus time graph of an object is a straight line mallecnx3.wo2 jcpf n/1w7fwpb/5o: (c 1)yo eoking an angle of 30 degrees with the time axis, the object (pbx yej31fo. /cl1 co o/nonwewc25fp7 :)lwis

  An object moves 15.0 m north and then 11.0 m souf;y :icd631vgjwk mqm5d5p y)th. Find both the distance traveled and the magnitude of 5q: 6gfc3 wyvimj5y)d pk dm1;the displacement vector.

  A boat can move at 30 km/h 0jv8krt2x8eb mx; w4oin still water. How long will it take to move 12 km upstream in a river flowingev8m2rx8 4wx; k0bojt 6.0 km/h?

  55 mi/h is how many m/s? (1 m-syd3g of9bkem3 e76j:jz*qki = 1609 m)

  What must be your average speed id f-pryq eb hu*7bzm n18-)3x kneo+i0n order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. xw hz3+b iu c*i+sgg(6 kxtj/)What is the average speed of the runner in m/sujhis+(3x*/6 w+ zg )tikgxcb?

  A car travels 90 km/h. How long does it take fklt.t8qmm 3x,e6 /dzhn ;u.oyor it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speedbar19a 1sd sr9i1 jl:f of l rlf9isrj1dba9 1 1as:ight 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 the sida (+,uor kwy-a2hc*wor-:kf t(bx z l)e for 4.0 s, how far do you travel during ubf2z -a,r(r lwkx c -+aw(koh:o*)ty this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, y pt xl50wlhxt3hyya d*jy*:8 8our average velocity iylxd:8xl tpw50yyh3*a8 jth *s

  A polar bear starts at the Nori5dev2th5 +.8 jth)vtjlj4 hm th 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. Thiseht5m82+i jl.jd45tv hhv )tj trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole.b 3xn9wmy5 0um It travels 1.0 km south, then 1.0 km east, th 9yummxwn30b5en 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 velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles.o3iib2 -+avxcom6 ry( 2s,ft 38 d qtu0tzwie. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from schoe3 i2s o3b, +i8ut xc f0dt(6-2vaq.m ritowzyol?

  A motorist travels 160 km at 80 km/h and 160 km at (oe2c1wzr5ox100 km/h. What is the average speed of the motorist for t(oz1xcr o5w2ehis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What iehitmg/cm+f3 )10dbz24nyzgymg;:) ldpc9r s her average dif mrz +h9my t4g0:z/g gde21bln3cc p; )m)yspeed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nortr jju0(f8 4ouqh for 750 miles. What is the average speeojur(q fu804jd for the trip?

  In a 400-m relay race the anchorman (the person who o7a* jz l2qhl1runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have w ajl7zh*2oq1l hen 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 11 s. Th (q9d izrs(lz9e car's average velocity during deceled(zi rlszq (99ration was 65 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160p i9gwf .p+fj a,oam *to53si; m/s, at the average rate of p;, wj 35ip* i9mog+ot .sfafa$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceldncey))w*7 b5u do 6k4gte+jg erates 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 acceler963 hbmk+ nciaates 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 sx quff(k)p do jy3j; 0p*8o1qd5tb, hup with a constant acceleratio fjpdfbh(okj0,tq81 yd 3*opqx;)us 5n 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 5.9 m/s experiences a constant acceler *-n b wwf/)f:izg +aq+obk5wadi )zo vz6r36dation of+o3gkid6zb wfw:+z) w)bv rf aia*q/5dzn 6o- $1.5 \; m/s^2$. What is the cart's displacement during the first 8.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) withq9f v3(7iuqd )liizg. a speed of 390 m/s strikes a sandbag and penetrates a distance of 29.59 cm. What i 7i ud.)gq3zfil9iq(vs the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fyl7o nyne0oge 5om1g: e/ak-y( h: +hdrom 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 acceg:y :0ye-hn7 hy (no1edak5moge/ ol+leration is constant, what is the length of the catapult?

  A car starting from rest moves with co4 tal1*dipn*-x0adk:0vfc i /ycf 1,c cnv 2yvnstant 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 its a0ul(aejg+7f hverage accelerationf 0+he7glju( a?

  An object starts from rest and undergop 9yj4 -0m-jyuovy k3fes uniform acceleration. During the first second it t0v3ouyjm 9-p4 yjf-ykravels 6.6 m. How far will it travel during the third second?

  An object is moving in a straight liti/ (gm jux)u2ne with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far doe)t/ij2gmu(x u s it move during this time?

  A car starts from rest and accelerates unicc aaj96s2+x,n +o(p ) xor/ 4awclzarformly 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 deceler/5xmzz *)s slcate 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 toe+mrz18 ao,wlbsf 6 ,hat has been waiting at the intersection starts aheaoz, 1mros la6f+ we8,bd 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 ozl7tg8 l,fpq42h qy4x n the surface of planet X where the acceleration due to gr tp7 2 yzgh4fl,q84qlxavity 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 surfacctb/j i9*6uvje of planet X where thv *jjcbuit69 /e acceleration 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 152:ft;q jbso 1l m/s on the surface of planet X where the accelerattj o;ls q:2b1fion due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the surfacgj0h9ws( s fnfq/ ud(1u6ww nh.e99ppe of planet X where the acceleration dne1.6gwnf q/jps9d0wsuh(9 9fh u(pwue 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 a r940c3 c aaaypouler between your fingers and releases it without warning, how far ca3aa04 o 9ycacpn you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s kag me:p( man4kq/ k*(q6hs)a. What is its velocity after 3.ekkn:)mm sh64 a((akpa* /gq q00 s?

  A bullet shot straight up returns to its starting point in 8 s.oys+(*+bb,qa 9dgf czr.j5jq What is the initial speed of the bullet+yzjs bc5 ar(*qjoq bf.9gd+,?

  A ball is thrown straight up with a spn rye +5dl qd49e,dlop(b3ij7ml 40g teed of 36.0 m/s. How long does it take to return to i5mr0y3dd 7egllnot4eq (b+dl,j i4p 9ts starting point?

  A ball is thrown downward from the top of a buildinv ac*o6ip u-*sg with an initial speed of 25 m/s. It strikes the ground after 3.0 s. Howv u-i6*ca*o sp high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numer6n p zwqf-)8q)d 0i*.(jpyxybq hzm9dical value in the blanks*p)whnpj .qqmyx9zqz(0d fbi6d y)- 8)
(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 48.8 m/s. d) 49g0b 1yjxd2 plwns(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 3 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 *z)rm2z4 fgvkn)8bomi1fj) f velocity at t = 1.0 s?

  In Fig. below, what is the xdapex8t:.yi37mb/ is0bu *mvelocity at t = 2.5 s?

  In Fig. below, what is 6u r ,cwx)j,xi4qs /buthe velocity at t = 4.0 s?

  In Fig. below, what is the /+ vqtmwy t,d,0 v(21vpz vuuuvelocity at t = 5.5 s?

  In Fig. below, what is the average j +eokhgy7n ozz1w ):m5o7 k(lvelocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6mv *k6a7,r/)ogrxevh .0 s?

  In Fig. below, what is the ac (v*j9- cjo zwa)5 axsxd) mhc6zj3cz9celeration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 s?(ilw nahp(6l1 m1 r kc2yr;1uz+a i-ab

  In Fig. below, what is the average rvp+a5 ebv sju--:iu5 acceleration from 0 to 5.0 s?

  In Fig. below, what is thersd dz) ;lx h+zhay3,3w 3)ddk average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement froi0t6nt air a5m-9xz7pm 0 to 8.0 s?

Does a car speedometer meaft m8tqk- i1-tox.u f7sure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is consta*hmysgm2x n ;6nt.

  The velocity of an object can be negative when its acceleration is xuc40uq,buv 0pj *u6:tpe+ kvpositive.

  If one object has a greater speed than a second object, the )pw6o /1mb whrdn4(kf-srl(j tkc 9;tfirst must have a greater acceleration1 s tpc;wftko4 6rh-w)(njrkb/9(dlm.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed /u teh,v.z+us(xxhn/ 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 increasin* c7hb ) j z.lgkar j7cjp/c*7mu8bxc6ol(u/gg in speed as its acceleration decreases.

  A baseball player hits a foul ball straigae3 sp/o muvls9h00/xht up into the air. It leaves the bat with a s /vsle3 0ou/h0 pxm9aspeed 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 speedsc 4 axv ,cl2oju67pwh( up, what is happening to its acceleration, how does it u2whx(,cv4a6clop j 7change if air friction is ignored?

  As a freely falling object speeds up, wvqjscj i:z/f m580t 2w.8pdnphat is happening to its acceleration, how does it change if air frc8v8jpz.pqfj:dm5tw i/ sn02iction CAN NOT be ignored?

  An object that is thrown vertically * 5cv;fq:ke2 m;o-5gwhvh m: q0 ee kne,w8wtlupward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this r0v h *q l;m,25tw;wekwcfvghen: 5qm:8-koe eesult be altered?

  An object can have zero ve7h g ;nj1/fkp3wx6d silocity and nonzero acceleration at the same time.

  An object can have nonzero velfead/r-ss8zqa,i xf 9qr)pe2 mdz3+ 0nhk+ p3ocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth flyqnp ia0 92k(coor making no stops along0n9qa2 k ycip( the way has zero acceleration all the time.

  A rolling ball moves fro /hlw1j kq8uu xx8y,1mm $x_1=2.5 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ 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 $t_1=-3.5 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ated9p;xcotzz xl(1 :5round a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, moving 94 m away if:5n ,r fq xv1 yw;n4)a9olqijn 13.0 s. It then turns abruptly and gallops h ,onarf ;159injq:fy4xlw)v qalfway back in 4.6 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 frondu12 9y xmm(4-v) e6 gnraxffm $13 \; m/s$ 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 from l7elety b(u 2)$22 \; m/s$ to rest in a distance of 80 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of 4bblfl0 7p ,xt$28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed /6nm5 :mkb7nnfzpards z5; e e0.o9bhabout enksn.o;6e:d5n rzm9phbm 705ba/f z$11.2 \; m/s$ in the first 10.5 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 uniformly from afp9r4ge: zd8 o,qa(si6. ybjv speed of $17 \; m/s$ to rest in 5.74 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. l fi*c g2;kis2Assuming a lc 2g i*2f;sikdeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trfpt78ejzs//)ir y7:ik tb:icj 7f/wjuck 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).    $m$