Suppose that an object trav3kxyn:mff f9ezm,(f 4z*y4jq n:3ufj els from one point in space to another. Make a comparif nfy ,:qxffuzm94 f4 yj*je(3nz:3mk son between the displacement and the distance traveled.

  When is the average velocity of an objec5(u ff,7d+ncn4gbja) wgmu x j:ph5 o2t equal to the instantaneous velocity?

  A new car manufacturer adver (97,ofgqt,mw)aqv j mtises that their car can go "from zero to sixty in 8 s". This is a description m,gq)otj9w 7mqf(,va of

  An object moving in the +x axis experiences an a4oqf,1na tzm7wtz.x)cceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to th58f/ a( spzqyce East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleray/ pa (qscf85ztion.

  Suppose that a car traveling to the West (-x direction) begins to b8gm+4f ;xz-igclxz1slow down as it approaches a traffic light. Make 4-lb+m icgzf1x x8gz ;a statement concerning its acceleration.

  Suppose that an objectlqlxiis y:(6aa (s(c; is moving with a constant velocity. Make a statement concerning its (y(i: 6aql( casxl; isacceleration.

  If the velocity of an object is zero, does ik;dx- -tnva( pt mean that the acceleration is zero? Support your answe;pk xvadt n--(r with an example.

  Can an object's velocity change direcmo r0 x9-u1p:.mcc(exi*e mqg tion when its acceleration is constant? Support mcxe-p0r x(cuo:*ige m1q 9m. your answer with an example.

  Suppose that an object is moving with constant accelerat ze9p9klw ww;+m:(7wmnggher- + op0cion. Make a statement concerning ipmnem +(;-:990zw egpckwwowhg+lr 7 ts motion with respect to time.

  Can an object have increasing speed while (v6yt*gpfox 2its acceleration is decreasing? Support youpf*v 2yo6x g(tr answer with an example.

  Suppose a can, after an ipp5 9ohx :-xwenitial kick, moves up along a smooth hill of ice. Make a statement concerniex-xpwo hp :95ng its acceleration.

  Under what condition is average velocity equal to the average of the object'i w s5o8m/j82 t6iridos initial ito w m2irs/5dj88 6ioand final velocity?

  Objects A and B both start at re*zri2-3 h7fqtcd v/luhu o2+ xst. They both accelerate at the same rate. However, object A accelerates for twice the time as objec2d-zrl3q * u 7oc /hft+u2xvhit B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They bohk+, 4/q/uctb8*h( 2 behiq j2lcrz wbth accelerate at the same rate. However, object A accelerates for twice the time as object B. 4/ 2 b8,bqkh hrq+wlj *cih(2 ezctbu/ What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absef92u.f fa 9eu-8yalv ,tpl)ez aebaq5 scn476nce of friction, which of the followin)u9.bc6 5-y7a4l9aenf8lpv aeaf ufqze ,2st g is true concerning its motion?

  When an object is released from rest and falls in the absence of friction,3nta x+u* cds2 which of the following is true sadnu*23tc +xconcerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity a84q(te7rfybt9sqqzg 8 z( r,ind the acceleration when the ball reachebq (g8qstqzr 89e4yfz7i(t,r s the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just b au *uom-aur n2qb246yefore it reaches its highest point?quy 2maou-b*r ua6 24n

  Suppose a ball is thrown straight up, reaches a maximum height, then favum3e/)0o7no,yy x) g lm/uzi lls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going uuyi,3 muymo7/) e)/lo 0xgv nzp.

  A ball is thrown straight up, reaches a maximum height, then falls5/v1hbyo w 2yb to its initial height. Mw1 25 /bhyboyvake a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown dow m3kkc8uk 3v:f.o 2r.1sp8l at 6sjoawnward in the absence of air resistance. Make a statemelv.k3koca k1 spfa wojs26t.:r 38u m8nt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration w:y8cdis,hx : zeoay6; .4t4lx x3yku fhen she she reach4uy,.t: x kyx3xa:elo8yi; d s6 zch4fes terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical seconxs4ecm,ey. oo4zd a l+p,s (hzu3e.vhav 1/u2d ball is thrown upward with a speed ,da pe1/om ozva ee. ,hu(43+yvl huxs.s2cz4 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?)

  Ball A is dropped from the top of a building.x8jh,(:rk ntf p:xwo 7:lr(kx One second later, ball B is dropped from the sa(xhjkof rt w:p xx::78l kn,(rme building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later,3)qi7k m/xrxz dwb1t0 ball B is dropped from the same building. As ti7wxq1dk3 )/xmtrz0b ime progresses, the difference in their speeds

  Two objects are thrown from the top of k; (so5et0*ouery. es a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the str.s;e eokru esy(5t0* oeet?

  A brick is dropped fromhcnebu z8 f p*;32jec, the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. N *bn z3h2j8eup,fc;ceeglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with co5 u)mo.9pekv7ghclh 7(k j9ydnstant non-zero velocity in the +x axis. The position versu) d7 k .9jg(5hm7leypcvok9uhs time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis.z*uy/ 1zqr4h0ysufz1g d/ 7rp The position versus t7sqhygz zr y40 d11r/zf*uu/pime graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The vpainh,g eqg srr-tko-2/( a pp06.w-eelocity versus time graph of this obj (0- /wnop,-apai6rk .hre2g-pegqstect is

  An object is moving with consta*y;5 95xnzqi ms8knh 4gvxi1)bowhc9nt non-zero acceleration in the +x axis. The velocity ver4g8obx*nhm q9x5 nwhci;5 ks)zi 91yvsus time graph of this object is

  The slope of a position versus time graph gives/n: utp kp+d2z

  The slope of a velocity versus time 5)7z6.j k g lwj(ba*zxcw cx2fgraph gives

  The area under a curve in an accelerationuk /w-m ,r 4y5t5baqcc; wmg/r versus time graph gives

  The area under a curve in a velocitvli2 8iwu8ym1 y versus time graph gives

  If the position versus time graph of an object is a cc5p 5(w 6vayznn77uhtdkf j6g*y.7s horizontal line, the object isdc7 n nktsw76yc5hz5g.fypa*( 7j6vu

  If the position versus time graph of an object is a vertical lineewap5zy,o3g 7, the object is,z aye op57w3g

  If the velocity versus time graph of an .to p:: z/n hxp3(s0sandldx5object is a horizontal line, the object is5xz: s.pp3ln0 xdtao/ hd(:ns

  If the velocity versus time graph of an obfd/c66 f oy*nlg8 u0qz 1h8hsbject is a straight line making an angle of 30 degrees with the tifh uq/ *6zsgc8 ld0y hb8o61nfme axis, the object is

  An object moves 15.0 m north and then 11.0 m south. p:wod0yp9i b38b e)ebFind both the distance traveled and the magnitude p)be :9oe p8byb3diw0 of the displacement vector.

  A boat can move at 30 km/h in still water. How l,dgiuam h*;o if/+g* yong will it take to move 12 km upstream in a river floy*dfi +mgho,/*igu ;a wing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 z +vvlorr-p4 ;oq*da *m)

  What must be your average speed in order to travel 350 ke /p8x;vh6i1 ( epequkm in 5.15 h?

  A runner ran the marathon (appqm.br8 b5 opdug.qa ;8roximately 42.0 km) in 2 hours and 57 min. What is the average speed of the rum.dbq b8.;5qar8pug o nner in m/s?

  A car travels 90 km/h. How long does it take for it to tjv 7p;i.l vz-fravel 400 km?

  A ly (light year) is the distance that light t (ce) (;(eorby5cqtxlravels in one year. The speed of light((yxeelbotcq5 r ) (c; 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 roadf5owsz( )d0 l vai)m 3(rdp(m,)bm fff and you look to the side for 4.0 s, h)lo,df)z p)m d sffirw(fb( vm(a05m3 ow far do you travel during this inattentive period?

  If you run a complete loly jfxk0jg 9ghw1,k9. op around an outdoor track (400 m), in 100 s, your average velocity iwkyk9gg.xj1 h0,j9l fs

  A polar bear starts at the North Polecg:kt vsh +, (9c(bgn:f, qblp. 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 poin(csvq(ghbkgl c,:b:+,9pt fn t. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then sub 8w.*zjgl-1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. Thibw8l u .j-s*gzs trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at+z6n.5zkx(qkqk +n 0u 5zhofcapo* 4fuz82ly 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 frop+k0k5 y*xf8u qnlz okau+(45 fz6qhz.zc 2n om school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 kmhf:uy0w 8 t tylh,6vq e(n:,hm/h. What is the average speed of the motorist for this tripm(,yhhwu 8 yt,hf:e0nv:l t6q?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her ax0kx lyn6)2 -au9yqgaverage speed for the tl2y gau)y-9 a0qxxn6k rip?

  An airplane travels at 300 mi/h south for 2.00 h and t-r z*d18gudt lhen at 250 mi/h north for 750 miles. What is the average spd ru- z*tdl81geed for the trip?

  In a 400-m relay race the anchorman (the person who runs the lhudpy kduli) 6z-))kk 5g/y+ nast 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 when the team A runner starts the final leg of the race, in order that the team A runner not los kd-i5z pu y)un)gdlh)/k+y6k e the race?

  A car decelerates uniformly an+zbecl9rv w0gc4/ ;rbd comes to a stop after 13 s. The car's average velocity during deceleration was 44 km/h. What was the car's deceleration while slowing do/r+ 0lb 49cgrbvew cz;wn?

  An airplane increases its speed from 100 m/s to 160 e+qx kpw a*2-om/s, at the average rate of a x-q+*oewkp2$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at tz;k rn3 4iayp*he rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest an7pr-/bb /yqrmc4:hg i d 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 s. It then speeds up with bi(i/;f qgd 0; r- ivxweug78ca constant acceleration o7g(0b/fcwrq;;dx-v ig i8 uief $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.8 m/s experiences a constant accelera-u((z ui/e- ,uz.n xoivm: 8bdjxmj zw-i wc15tion o(xx nw.zz1-w 5-: 8 j d, buioi/jzevuumm(i-cf $3.3 \; m/s^2$. What is the cart's displacement during the first 4.4 s of its motion?

  A bullet moving horizontally to the right ya6karl a..3h (+x direction) with a speed of 272 m/s strikes a sandbag and penetrates a distance of 41.05 cm. What is the average accelerationly 36.kahar. a, in $m/s^2$, of the bullet?

  A jet fighter plane is launched f9b.z:3n4bde gw+8 ihqacdi9 irom 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 +i: g8 n9biewazd4qh.dci b 39the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleratio(s v q-c4 dwc9d7orj0sxyi4z5 n 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 aunteq -ho-u og*)e1 )jpe *b4q distance of 200 m. What is its average acceleratio) *g1n-*4upjeqo-e ) uotbhq en?

  An object starts from rest and undergoes uniform accelerationi/ k acf(.yfyia1o;1k. During the first second it travels 1.7 m. How far will it travel duryaak /i(f1fko1 .i;ycing the third second?

  An object is moving in a straight line with constant acceleration.a88-l.jdd qa cd0.ohc( 01zutzm red( Initially it is traveling at 16 m/s. Thrqdoj .ld08.c z (0aeca(1 -ut8dzmrdh ee seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleratesdqnwc(n7;0w,.e yb a7w.9 rpipxira2 4.kkom 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 dryr2q cx r:5y5lk road 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,4)c+c a, m7 zrqe,vcngi8 rg +3xjtkt has been waiting at the intersectiont+,c7me c3r t, 4ng +qrka,x )civ8gzj starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s on the surface of planet uw+2u- uq ija1k7oel+X where the acceleration-uk+q+e1lujw7 2 i oau due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward w10mag8 u r6 :ic5kkuggith a speed of 12 m/s on the surface of planet X wheg1u k cr5g:uagi06k8 mre the 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 15 m/s on thez)f o;ufo(0 d,1o f4nwd epy6s)5pmzs surface of planet X where the acceleration due to gr s6dze(sozw),;o yfo )mfd0nup14 5pfavity 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 141a*4)tjh ax oy m/s on the surface of planet X where thya x*4oja 1ht)e acceleration 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 a ruleuvai.y9xcfr*o3 *) 1 l o/srfir between your fingers and releases it without warning, how far can you expect the ruler to fall before yo x9lo/1o)aic i **s.rvyur ff3u catch it?

  A ball is thrown upward at a velocityp :.vydy fb +7mb5a2qs of 19.6 m/s. What is its velocity after 3yq+ 2s57p.:mvb bdfa y.00 s?

  A bullet shot straight up n) 9dkjg:xc )sreturns to its starting point in 6 s. What is the initial speed of the bulletn9))d xckjg:s?

  A ball is thrown straight up with a slm4we ; uvl2+:tjk4c 6ekj qp0/fej2qpeed of 36.0 m/s. How long does it take to return to its starting pointjkl w/tv 42q:ek u0;+cpl2 fm eje4q6j?

  A ball is thrown downward from tc4g*; 8aip6o7 xk)e9qcrf qdjhe top of a building with an initial speed of 15 m/s. It strikes the ground after 4.0 s. How high is the building? cxd7aeo64ij9 pfqkq)c8r*g ;

  A ball is thrown straight up with a speed of 30 m/s. (only fill in np8ilf:br3p+ vumerical value in the blib +:ppvlf 3r8anks)
(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 35.3 m/s )o3zx;quje.6j 2xh,*oiigbh. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 9 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what i2- rdr4s/ mgvts the velocity at t = 1.0 s?

  In Fig. below, what is the z)9-y a0ep)bvx1*cddi0mfbt velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0+a )e- vcoiez hy;n:s) s?

  In Fig. below, what is the velocity at t =ga:+( mc2pqf+zim p7e 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.*2v 8c::vo hajb-0kv ;a cazjj0 s?

  In Fig. below, what is the average velocity from 0 to yq;dlc*e0 -g0ude+xg6.0 s?

  In Fig. below, what is the accn4 nx c6x;dcrwc4(:daxu pj, 1eleration at 1.0 s?

  In Fig. below, what ;1/h;wuk1wo 4.yw s q,pywiebis the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration ,tj wb.ssqd* 3from 0 to 5.0 s?

  In Fig. below, what ispgd yc9 ilsintyh5r/.: :ppx,i ht.62 the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement/i8 *b umhq. 7yev47u ypdda;q from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spee8 cv:y ws3n4nzd|velocity}

  An object can have a varying speed if its velocitytgkt* 9g 9m)e jmzs8e.;2eha l is constant.

  The velocity of an object can be negative whenbfjf(9, id9 -h5hj9vk x bp0xl its acceleration is positive.

  If one object has a greater speed than a second o (wktq+k+ 6lcqt:-ek dbject, the first must have a greater acceleration 6-kw+l(c:qtt ke+dq k.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed k2-vaccd/gw 5-:g+ rvpprj (tof $60 \; km/h$ 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 dedxdd0b wsj6:di0.iuj, v ce l4y;3ll)creases.

  A baseball player hits a fa/ (ysoxkzo0 fnqqg()b b6b1p(ut d1.oul ball straight up into the air. It leaves the bat with a speed(db1(q.1zspabny6 xtf) kogb u q(0/ o 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 acceleratih f,cz;u4qnr9rjv ;e:on, how does it change i rqen4jvhf,;r ;9uc :zf air friction is ignored?

  As a freely falling objxkn 2luhaxs9()i e(0;vq zjt *ect speeds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignored?iv;(*k ue2 z)n(h9q 0x ajlstx

  An object that is thrown vertically upward will return to its original positi+h( 6the2 uzmyk m ,1jgluc)8bon with the same speed as it had initially if air resistance is negligible. If air resistance is appreciablc1m28(emlykgjh)6, h +tzbu ue, how will this result be altered?

  An object can have zero velocity and nonzero accelerat,-s.qha+i odo ion at the same time.

  An object can have nonzero velocity and zero acceleration at the same tw7cj*ay x v7/lny+zb/ime.

  An elevator moving from the second floor to the fifth floor ma:s eobusoqrd/c++1 - jking no stops along the way has zero accele +-d/1 bqcru+s oseo:jration all the time.

  A rolling ball moves frj r/1m1sj9llsb i7nz 9om $x_1=2.4 \mathrm{~cm}$ to $x_2=-6.3 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milyf/vq9bb (vn9 e ($1 \; mile = 1609 \; m$) track in a total time of 7.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trw8lf85 va2(- yn 6prj-ghkol gainer in a straight line, moving 87 m away in 11.3 s.vwo lljhf8682p5- arg y(-gnk It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates frot)rm af.v(az03wk;fy m $11 \; m/s$ to $22 \; m/s$ in 5.7 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.3 9*p ogoiuqf :y awf(+5hktl)qoak, $20 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed8 q4ymbs,a+ qvam9 3vl of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abo:(j)snwc3n9) xma+g p xrjkx rcocy*823p4zo ut )xjxpc:kp83n) o+o3c2jyrsazxm9 *n (rw4g c $11.4 \; m/s$ in the first 13.4 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 uniformly from a s 73ux1w qgv o h7e*pkpq((ur c:j8ln)cpo om/1peed of $17 \; m/s$ to rest in 4.27 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks4bu h0*zt2pffu4ow k6 92 m long on the highway. Assuming a decelerati*fp2 0ob6 wk u4fhutz4on of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckj)qxrra *hbr4l a xu+ q6a+7+c going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 mtqbh n--:) dw+/mkymo-jogub -/*o edin. After exactly 27.0 min, there are still 1100 m to go. The runne-yk/) :-udq+og/meow-b njbt- om *dhr must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$