Suppose that an object travels 2p.ob4kruph d--c/ xi; scw3ofrom one point in space to another. Make a comparison between the displacement and the distance traveled.s/db-r xw.ku po2 4-i3cop; ch

  When is the average velocity of an object equal m(*1 wadnnao+to the instantaneous velocity?

  A new car manufacturer advertises that their car can/ajzq1hd kpl+ uf i.6r-h/z s5 go "from zero to sixty in 8 s". This is / j-ia/s 1 hl rzph5dfuk.+6qza description of

  An object moving in the +b:ez61snl mrks1al-a3g w8 zl:m06y kx axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) d4x.,dx:3:bu97ofcddl1 cwq da er5wbegins to slow down as it approaches a traffic light. Make a stateu 4d9d17d3bcqwc:e o. axd5 :lwxd ,rfment concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) beginsv) ;uo1b7e z,6f at 7ulqijq,i6i- umk to slow down as it approaches a traffic light. Make a statement concerning its;jo-7,qm6ub qiu tz )aiv1,ufle76ik acceleration.

  Suppose that an object is moving with a constant veext7dnfd853 31 uexc jma-/ imlocity. Make a statement concerning its acceleration./ ixant md1j7ex5 e8-33dmucf

  If the velocity of an object is ykn,9p:2ba ano- bb, vzero, does it mean that the acceleration is zero? Support your answer2ay:o,-p abknv bn 9,b with an example.

  Can an object's velocity change direction whekdoul tkf1g3078h+ 1/je0rlhn 9h cp dn its acceleration is constant? Support your ans/8 dheljp3 +chkf 79ntdg1h0r0k1 louwer with an example.

  Suppose that an object is moving with covv f) 4yxb u6eb*2)pugnstant acceleration. Make a statement concerning its motion with respexeub 4f)vb) vuy*62gpct to time.

  Can an object have increasing speed while its acceleration is decreasing? Sib pa:5o nrzl7jdfh 31s3)d5xupport yor5f5o:1azspji n hxb)d 7d3l3ur answer with an example.

  Suppose a can, after an intj2z+ i 8drmh-itial kick, moves up along a smooth hill of ice. Make a statement concerning itst dim82+z -hjr acceleration.

  Under what condition is average velocity equal to the average of the object's i; pgrs420k ;q /qk4onvxylak) nitial and final velo/0gr;o nk;44xqa )2 kvkql yspcity?

  Objects A and B both start at rest. Thz, /r-anlljp/w 9x.e tey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of-lj/ax .nl /ew9z t,pr object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at ,ydcwz(ihu. gufy2 xh 2c5n7-the same rate. However, object A accelerates forh25g,ycc ( u-hn7 zw.uf2xiyd 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 in t)5ysh nash1l-he absence of friction, which of the followinsa5l)n-y1h hs g is true concerning its motion?

  When an object is released from rest and *is;wq ;*uflxki7a9u falls in the absence of friction, which of the following is true concerning its motikf7lu xs9a* wu;iq* ;ion?

  Suppose a ball is thrown straight up. Make a statement about the velocig 60qmxgmjc0 3-0lmr nty and the acceleration when the ball reaches the higqj03g0 mlngm 6c-mxr 0hest point.

  Suppose a ball is thrown straight up. What is its accelerati:0k,p hmfpx-ahij: 5zon just before it reaches its highest po5h:x mf,zpk -j 0pia:hint?

  Suppose a ball is thrown straight up, reaches a maximum height, then3lu+6aj j l lgmfx263u falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goijf gaum66ll33uxl +j2 ng up.

  A ball is thrown straight up, reaches a maximuma e ws:nq) dl1jqr:d.um *-c*y height, then falls to its initial height. Make a statement abouqq:yawel*mr nuds: d.) j -c*1t the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resis-a p*m zrbtq,8jj0,tm10e xaktance. Make a statement concerning its acc,-jqarzm* ej0atpm1 b0tkx8 ,eleration.

  Suppose a skydiver jumps from a high-flying plane. z7tivo+ i( cxzza7.fz8mj- n * What is her acceleration when she she reaches terzzzx.78 * tvaifozjin7+m(-c minal velocity?

  A ball is thrown vertically ftb263vf) +aal gu*n(q/ure dupward 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 second ball to that of the first ball? (How many times higher does the second ball go than the first ball?3d / l (*aavqrbu+fn2 g)e6fut)

  Ball A is dropped from the top of a building. One second later, ball B is dry 7vpst1(knoxr 9ml9.pg98z mx4qxb : opped from the same building. As time progresses, the distance betwbq97( m8op9 rl4 :xtmz.nvxgpx1k 9yseen them

  Ball A is dropped from the top of a buildin2 p (j8jqrrjpqd--ys*g. One second later, ball B is dropped from*jyjqp (-r28r-sdpjq the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrwct dzr2 y4+/5f e- u;eoep;il,rv9 qbown up, and the other is thrown down, both wt4rz+,e-y/ c;led 9 f ;ep biuwvr2oq5ith the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second8r;upt4eshfqd 3k*e* brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the ac h 4*rqpk*edu3;fe8st celerations of the two bricks.

  An object is moving with cq3ufbeu-1*0y06fws// fm xb koz+fr u onstant non-zero velocity in the +x axis. The position versus time g0um1q f6kbs uwz0*/+r3off/ e- yb uxfraph of this object is

  An object is moving with constafm:ijim uh00 4q2kb i;nt non-zero acceleration in the +x axis. The position versus time graph of this object iq0i2mmk0j ;iihf u4:b s

  An object is moving with constant non-zero velocity in the +x axis. The vi kfjk lldjx2 ss/05m ,*-dhw5elocity versus time llfhj 5kx /05skdi-mjwd,*2 s graph of this object is

  An object is moving with constant non-zero acceleration thpd uz.5i9hz*/xw0s co1 e2vin the +x axis. The velocity versus time graph oz/1ct0zsxh9uoh* 2 v p5 id.wef this object is

  The slope of a position versus time grapr v9tb(,9 idswh gives

  The slope of a velocity versus time graphztno 11z9g1gu gives

  The area under a curve in an acceleration t;zdn,-eqhn d ys5w+9(sq8+zl6 sv yfversus time graph gives

  The area under a curve in a ve n,d;zpp(ue/p locity versus time graph gives

  If the position versuse69v- b /pve/vvd8izr time graph of an object is a horizontal line, the object ipe /bvr -vi9d/evz6 v8s

  If the position versus time graph of an object is a vertical line waj350j wp6yf, the object iswfyj3 05wj6ap

  If the velocity versus time graph of an object is a horizofbcs(o2w):ibhpylk 59 xz/d * ntal line, the object *y5c:h(dz l fspb kw )x/o29biis

  If the velocity versus time graph of an object is a straight xwuk ehveg9rq.*-0v9 im x24l line making an angle of 30 degrees with the timqleg2imk40xe9vxu*whv - 9. re axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Fi vf .f)us6qg) bre2yph:1x5synd both the distance traveled and the magnitude of the displauv2) fp 1): y6sryqehf5bg.xscement vector.

  A boat can move at 30 km/h in still water. How long will it take to mca+hc.1d-;+db8qncq oo 9 cbkove 12 km upstream in a rivckaqqncb;h +d 9.+ 1co-bocd8er flowing 6.0 km/h?

  55 mi/h is how many m/s?:d(2duaj i.xt,hixm 4;f lc6n (1 mi = 1609 m)

  What must be your average spee+6-fs4y5guaw5 ig ro ed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximat/g2mvunn 2 /tkn)(sg uely 42.0 km) in 2 hours and 57 min. What it/2/ k(sugnvnun m 2)gs the average speed of the runner in m/s?

  A car travels 90 km/h. How long dt ),5aazgu8p ooes it take for it to travel 400 km?

  A ly (light year) is the distance that9w6ibvj((l :-p 7ewa. .qrnvzj) iouj light travels in one year. The speed of l-)vvwju l(jen.bi prj6o (q9w:. i7zaight 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 kuz3dbfxv 1 yilwxn4.7 4jh(6look to the side for 4.0 s, how far do you travel d6 wv3jb. (z7n4kxhyf4i lu 1xduring this inattentive period?

  If you run a complete lx omcwsl+ :.//d)/sfz+8 jfpnoh5 go poop around an outdoor track (400 m), in 100 s, your averan:pzl8p c oog.xs j s+h+//w) 5ffmd/oge velocity is

  A polar bear starts at the North Pole. It trave iacg) st6 nxqx+0b-4n.+ ztldls 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its stdx q)+4ns tnl6+bca0xzgit. -arting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the N wd(:;czryn0cw4 kd/ 5mu.wr, opei0zorth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km noro yd5p; mc r .:/nk0zewuww0,rci(zd4 th, 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 ak1w 3.vwsn lvbv ktg3s59:c+z weekend 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 hours and 15 minutes. How far is your hometown from s czklw n+vw t 13:3s.gv5v9bskchool?

  A motorist travels 160wm0r1ji3vztm b,r t x/ qgg.gd-hs/ v,mu/4 +i km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?htgm i rw/b/jimq,sgrx+3zm vtgd .vu1 /4,-0

  A motorist travels for 3.0 h at 80 km wmixiwh; g739/h and 2.0 h at 100 km/h. What is her averaw; ixg79wmhi3ge speed for the trip?

  An airplane travels at 300 mi/h so( 5.-xk pry gg1 g4t9zqjnggr4uth for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?y q4t.z 5g9xg 4rngkg1-rpgj (

  In a 400-m relay race the anchorman (the person who runs the last 104pldifb1es0p1en c;l0(: lxqks w5g70 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 when the team A runner starts the final leg of the race, in order that the team A runner notk7p;x50q1bw 1i 4l e cs0spg(nelf dl: lose the race?

  A car decelerates uniformly and comes to a stop afkw+ae sf6.ck)oc .:ke ter 11 s. The car's average velocity during deceleration was 62 km/h. What was the car's deceleration while slowing dok.e)s:k ck wf6eoa+. cwn?

  An airplane increases its speed from 100 m/s to 160 m/s, at the avly*a+e qb7igs/ (d sfnb(rs1vq1k d/* erage rate of 1d bqiysag1s*/vkr l(7(* s+bnfeq/ d $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accel0 cap+ve*urw9erates 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 acc( aodjl0z ugl42n) ua:q4w(dgelerates 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 i5hj dhdy.w3- -ott 7n0:diru m/s for 10 s. It then speeds up with a constant accelerationy -7 h0: dohdjntt3d5wi -ru.i of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocitynuwuc0trd782 xi3wip nh(yr( 1 wqd1tr. b (5s of 1.1 m/s experiences a constant acceleration o3(xurnh d(w.8i rdn0 tsw57ptcw12(u1qb iryf $3.9 \; m/s^2$. What is the cart's displacement during the first 6.8 s of its motion?

  A bullet moving horizontally to the righttvaaw./ -8 hd(mcyhb: (+x direction) with a speed of 471 m/s strikes a sandba. avhc:(dy /8-w mhtbag and penetrates a distance of 44.45 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier;4l* ,cs 0i9;msuez3lrfuykr. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. l; rfcsuirk0z 3* e;ylm 9s4u,Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest move1m.xmx7p *hot s with constant 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 dis8 vhp5x9bj0f6 bz3znrh +mk.ttance of 200 m. What is its average acceleratikf r6 zv5xnhb bmht0.j398p z+on?

  An object starts from rest and undergoes uniform acceleration. During the firs7 1z,teifpsg,u x5q)lt second it travels 2.5 m. How far will it trav7f,i )5 tpsqzlu ex,g1el during the third second?

  An object is moving in a straight line with constant acceleration. Ininuk n ;l4 3sbbfo* kjj80qekob179)q etially it is traveling at 16 m/s. Three s;q*)oq 0 bjbe k19bu38 kn7ofj4kne lseconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and ac gfbc,r6izr ma-n5d8ud (16pucelerates 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 roat8 ( +ga3pxomrd 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 gre2bkml7)9ija8 ni y.nk nqm*+s en, a car that has been waiting at the intersection starts ahead with a constant acckn8b2*7n9qi)ks mnm.ly a+jieleration 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 planqy ) spm;me13hfvd46e et X where the acceleration due to gravitym)qhv16y4 ;mp e edf3s 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 ofu/ 268:r cif f8pnrv wgz.2dxn the surface of planet X where the accef 2d28f irn:rwcp .gxv8uf6z/ leration 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 withao(k9s.::ea h7iyz ibxzvdb w ;k9-a. a speed of 15 m/s on the surface of planet X where the a d :9wo.-a(b;h7e :aviay.bk sz ki9xzcceleration 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 surface of planet X whei-x p;s.sijwb/ac.w: re the acciww:s.;baj p i/.s-xceleration 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. gtv4e h e8l3.;nnjdq+10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch itn t3 qeh+4.dvn;elj8g?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after *yp/2xccev 3f 3.0vce/pf3yc*2 x 0 s?

  A bullet shot straight up retu,sx ywwoez7kt 24mx0 0rns to its starting point in 7 s. What is the initial s04 o27smyw,e kzwtx0xpeed of the bullet?

  A ball is thrown straight up wit-vc q pm0:h5ijc ely0/h a speed of 36.0 m/s. How long does it take to return to il -yvcjem/0p 0ihq5:cts starting point?

  A ball is thrown downward from the top of a buil x *wab 1,0/ljwqxnwyi/8fml- ding with an initial speed of 24 m/s.l, x/wjymw- qx0ln/ bfw8*1i a It strikes the ground after 7.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only l9s/ mo:pv idxmir ;:,d hq(p4fill in numerical value in the blankp lm :px hior9/ 4:;(vmsdid,qs)
(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 ikb avmx *g/z15w 2lj ,)rhg6gspeed of 31.6 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 3 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 at t = 1.0 ylg*9 ox7y, 7rlfq8gus?

  In Fig. below, what is the velocity at t = 2 wu(0gh2z-uv v5nk)g42 ga fsllk ;ym).5 s?

  In Fig. below, what isvb: f0cff ol,f0h+)ys the velocity at t = 4.0 s?

  In Fig. below, what is the velocigd i1* 2gporx+ty at t = 5.5 s?

  In Fig. below, what is the avera d1+ izp5,njsgge velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 c9hpsw4cc 2knue+/ n)to 6.0 s?

  In Fig. below, what is the accelmbb;t6 yh:n h9eration at 1.0 s?

  In Fig. below, what is the acceleration aau vvs+1u2hx+t 3.0 s?

  In Fig. below, what is the average acceleration from 0 0pn2cv1- kek8cn8vb qto 5.0 s?

  In Fig. below, what is the yd l92bo;d q-haverage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0*nus0-n1 bx b 5dd4tli;p pe-d s?

Does a car speedometer measure speed, velocity? {speed|veloc:gzs)tr i6 s-u6cgcf-ity}

  An object can have a varying speed if its vel 0+lypq0 bw*n2, cxiccocity is constant.

  The velocity of an object can be negative when its acceleration0fp ut/zps w+x9hfr+ 9 is positive.

  If one object has a greater speed than a *6ut6w xfchx 7txu6-v 3eq2rf second object, the first must have a greater acceleratv h3-fr 6u7 tc*x6fwexuq x62tion.

  Two cars emerge side by side x5t *a*lxp(uwfrom 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 increasing in speed as its acceleration decrea:uh (p :gdbqwt:6,ohd ses.

  A baseball player hits a foul ball straight ka xeoe+3e0k-w +zso0up into the air. It leaves the bat with aaw e+oze+-kkx0e so3 0 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, u:22n yahg oa;nghg8,how does it c8 hyh gg,nna2;o:gau2 hange if air friction is ignored?

  As a freely falling object speeds up, what is happj6t2xh4uf7g r ening to its acceleration, how does it change ifh6gf 7x4 ut2rj air friction CAN NOT be ignored?

  An object that is thrown(pkc1p7 0- r ui0apoapoew6 o4 vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If 1oaap470ip0e(rk oopw p c-6uair resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the sam +mfql6dlvvb3e)5 0 ts; wy7pme time.

  An object can have no34 d; fvkl*bzonzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth flo uf:4k-es+gtxor making no stops along the way has zero acceleration all the tis ke:gtu- 4+fxme.

  A rolling ball moves fry;v 5u8mnwe*k om $x_1=2.0 \mathrm{~cm}$ to $x_2=-7.7 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qu);bj3c+zkmrv arter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its traiw6; (t 3n.k,vs ofsfbxner in a straight line, moving 96 m away in 11.1 s. It then turns abruptly andk w fv(3n;s,f6.tbso x gallops halfway back in 4.8 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 froljtejo2f- ;h :m $11 \; m/s$ to $23 \; m/s$ in 4.6 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 jwljmn93e0h)ksgfu/j1 l-s 2$15 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach 7hhe/l p m,tzsd)pf/2a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abour0 z2m0p)s n 65z, v0spagqwjbrlx 41ttpzpss0a,t2r1l b m5z gvrx6)j40wnq0 $10.8 \; m/s$ in the first 11.6 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 oie8pb/s 0jyu3 f $19 \; m/s$ to rest in 5.30 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid sy/r( yjv 1qmypt80 2itu ,c)fmarks 92 m long on the highway. Assuming a deceleratiou ,yspf/ymj vty c 2)r(08ti1qn of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truci4h*an ;s5mgkqq tx2/s y.e 5f uqv3n/k 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 30.08 sbht)lf -uw- min. After exactly 27.0 min, there are still 1100 m to go. The runner must thenls- hwb u-)f8t accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$