Suppose that an object b gntk+lson7sa01 k57 travels from one point in space to another. Make a comparison b0ba5nso7gn kst7 l+k1etween the displacement and the distance traveled.

  When is the average velocity of an object equal th*pw7y hnwg9sd;s:2po the instantaneous velocity?

  A new car manufacturer advertises that their carl:z/s oz0d 6kd can go "from zero to sixty in 8 s".z/dsdlo 0 6zk: This is a description of

  An object moving in thezj bg54hv6mro-h59vd +x 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) begins to 5:vmlse;8 ,bnxwparfc-l/ s/ e-k3 fwslow down as it approaches a traffic light. Make 5ef8m/-l,wfs: vbsaerl; n- 3 pxw/cka statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow hcsfsj y ;d (bm:;lz,bn/q c93down as it approaches a traffic light. Make a statemen;9s(bbc:n fcsqdlh/3z;mjy , t concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a stateme,x8 lo0 o1bov(c6id- h.sj3h 3td2iciqe/lzl nt concio8slj-iocq3 b 6clx30z.hti/l h, 1ddv2(o eerning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration isum;q .x** uqdd zero? Support q *dd.m*;xu quyour answer with an example.

  Can an object's velocity change direction when its acceleration is c:cq,sgj 7gic7i op.w1*ne n)p onstant? Support your answer pc :ggqo i)i*wj 7. ncse,p17nwith an example.

  Suppose that an object is movi2w ft2sgm*a7ob ew p*t,oio1,ng with constant acceleration. Make a statement concem o e22b1f,,*iswto oat 7gpw*rning its motion with respect to time.

  Can an object have increasing s vnje(m(t5 ,4jsni uc+peed while its acceleration is decreasing? Support your answer with an exampu ,5jvt nn4 (ise+(jmcle.

  Suppose a can, after an initino2ln7 rp9o1f al kick, moves up along a smooth hill of ice. Make a statement concernin1 opo fr7n92nlg its acceleration.

  Under what condition isjwth+)9nr0k hv o;a8f average velocity equal to the average of the object's initiah nwv)0h8or;t k9+jafl and final velocity?

  Objects A and B both start at restv lz3-zq :4m cx+v:u.lq:qecx6op9b o. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to vp9mu qx-:co43:qzl.:lq o vezxb6c+ that of object B?

  Objects A and B both start from rest. am: jlouo4 xq.99ii 6z r2xrg,cd v7h4They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of obje6qolz9jg, x:i9.r 4 aom 42dhu7rxi vcct B?

  When an object is released from rewfe: xnxs :)orbtkz*08 f0l6 zst and falls in the absence of friction, which of thx)ff 8*o eznl: 0bkrzs0: 6xwte following is true concerning its motion?

  When an object is released from rest / s;vd-- gsifqand falls in the absence of friction, which of the following is true concerning its -/sq g ;if-vsdmotion?

  Suppose a ball is thrown straight up. Make 2-k hy7 rwn*aqa statement about the velocity and the acceleration when twyr2- qa7kn*hhe ball reaches the highest point.

  Suppose a ball is thrown straight up.rxmf c jjx3/lw ;hs7n (6db:0l What is its acceleration just before it reaches its high x7fsmx( ;nhllj3wcj0:6 rdb /est point?

  Suppose a ball is thrown straight up, reaches a :q f(k9pl f9ogmaximum height, then falls to its initial height. Make a statement about the direction of the velockoff(: l 9pgq9ity and acceleration as the ball is going up.

  A ball is thrown straight up, reachj 5, r4ph)tayje./btkes a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is co5ya4/)jp,trb etjk. hming down.

  Suppose a ball is thrown d3oy5lw/rk y 5l7t9d elownward in the absence of air resistance. Make a statemen7y oy l5trl/k59elw 3dt concerning its acceleration.

  Suppose a skydiver jumps from aoe.-7vs) ban pgbaa;ed1 (9gt42 em uy high-flying plane. What is her acceleration when she she reacaobee4pn bdu m1ag2(97-ts )g.v; aeyhes terminal velocity?

  A ball is thrown verticallaf;h/ u +javfi:l/p.py upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does th /fa+:u;avlfp.pi/hje second ball go than the first ball?)

  Ball A is dropped from the top of a bui s/lt qj5zy(u q3daz8ps9a1d9lding. One second later, ball B is dropped from the same buia dy/3sl qj99sp85q1z dta(uzlding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B o9zgvf9baodi( bb81q a;x 0at.j sf,- is dropped from the same building. As time progresses, the diffe-089afs(jgbz9aqtbi o1.bva x d, f;orence in their speeds

  Two objects are thrown from the top of a tall buildia1-0 p 1skcn tcvy3e(nng. One is thrown up, and the other is thrown down, both c-c(pkate3 n 0v1sny1 with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thx y-bkd;gj 2/8 kn4hwkrown straight down from the same building. They are released at the same time. Neglect air re2 4;ykb gnwxhd8-/jkk sistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Theyx (.0pf6hk pup(ovn7 position versus time graph of thn(( vyp76k. hxpup0fo is object is

  An object is moving with constant non-zero acceleration in the +x ax.2z0opb im j+oa852pd/ftk vw cu6 eg/is. The position versus time graph f/+2tk2/ejwg i5vu.op6 0am8po bczdof this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocio6tjt7yo6j7c c162wxe f4 jxaty versu 4626c71w cjxjot oja7fxt6yes time graph of this object is

  An object is moving with constant non-zero accel 76orji 6 ,armwxct)r8eration in the +x axis. The velocity versus time g7xirr a6) ,8m6octjwrraph of this object is

  The slope of a position versus t z pegd9; gv9fal2z5s*ime graph gives

  The slope of a velocity versus time graph gzelj*wz 4 7-x 8rhuq*mives

  The area under a curve in an accelerationjp-,,dyo rt/ essf*q ) versus time graph gives

  The area under a curve in a velocity versus time grap:cf*cv 7hm (huj,pt n(8kdv:sh gives

  If the position versus time graph of an object is a ),pvm3 uqq )q+;gic5vvlqo( l horizontal line, the object p+; l vl)3uq5v c vqgi,)qmo(qis

  If the position versus time graph of an ps1 cn h(0gyh1object is a vertical line, the object isyh1 n(scp g0h1

  If the velocity versus time graph of an object isfqa 7.3kox8; 0dswuz y a horizontal line, the object i83s.dk uf7 oy aq0wxz;s

  If the velocity versus time graph of an object is a strai8hqbuojw * .d4ght line making an angle of 30 degrees with the time axis, the objectq8*bd 4ohj .uw is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trav u 1*:hv)qf*trzv.bjzeled and the magnitude of the displacementhr. *v1 fb)ztuvq*:zj vector.

  A boat can move at 30 km/h in still water. How long will it takem6 f g( er.no*fdt)yj1 to move 12 km upstream in a .m d6g)*ot(ffe1 njryriver flowing 6.0 km/h?

  55 mi/h is how many m/s? blg( un8.5t ua /dsv(g(1 mi = 1609 m)

  What must be your average speed inru fb ,)5k18xryo;sz t order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min.i*c b*gr5u9 bdzg9u6wcz5u ;r What is the avera69uu55ci9*z;urg*wd zb brcgge speed of the runner in m/s?

  A car travels 90 km/h. How long dy;7.jwbvm2.m oj3 r rqoes it take for it to travel 400 km?

  A ly (light year) is the disi ),,;48z c6ocvggav bnegx :ntance that light travels in one year. The speed of li: c)6,vxzg,gibo vegc 48nan; ght 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 k f )2s1:ul.iepbzn4tg9 +uvialong a straight road and you look to the side for 4.0 4le2)1f+: nuk u9i.svz pgbtis, how far do you travel during this inattentive period?

  If you run a complete loop 10 qf+7rlsk enk o2gj)2e,7c zbd+v tuaround an outdoor track (400 m), in 100 s, your averag o21dg)fn+vczu b 7kr,2 jle7 s0+kteqe velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south,au 3dgegt269z /.ux vnzo4zbe7 v. li/ then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its stab46exz/.gnl v9udiotvg/ z .u7ea 3z2 rting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at tnwpsy ;vv7y i y8p r(.zjg*y-2he North 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. This trip takes 45 min. What was the bear's7gpi*8pwn;vryy-yz yv.(s2 j average velocity?

  You are driving home on a7ydd +rvkyg, -*hn:x j 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 afkxyn,: yvg- h*d +dj7rter 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 c/7k um sw5u- ji;cq2iis the average speed of the motorist forucu k5s jq2;7-ii/mwc this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 10o-gcfxe) lgyk;s ;y; *0 km/h. What is her average sl*;yx-;sgco f g;)ey kpeed for the trip?

  An airplane travels at 3yxgf jhhmq()t.- +wc ,00 mi/h south for 2.00 h and then at 250 mi/h north for 750 mil. cf,gx(qjyw ) mhh-+tes. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person +.(plo a9j i3jajc wvb7 ,n+wdwho runs 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 when the team A runner starts the final legv ++c jjo(,i7ad3ab lwwnp9j. of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 12 s. 1v51;aql( eh9ytnk n sh ih1/z The car's average velocity during deceleration was 78 km/h. What was the car'skh1 /es(ny 1v ah znhqlt95i;1 deceleration while slowing down?

  An airplane increases its spee*z )ozwmjt mvrhs9)oc 7tj363 d from 100 m/s to 160 m/s, at the average rate of m3zhs3m6*jw7)orv 9z t ) joct$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerati6xju8n; yntb fs9-r--sjd -tes 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 q vcgd+8 usqi 0 gu/t/-oj(/nxv4h *jhaccelerates 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 a constant acb)6x*5 qix;qna/;or9n hr v/at pua *jceleration of q/j;p6 aqb uaran* ro)vxh 5;itn9/x*$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.9 m/sp4( t :xignp80fufh;c /7 nga*e*de xn experiences a constant acceleration ofpcx*n x487e f( 0nnidp ;tegahf*/ug: $4.7 \; m/s^2$. What is the cart's displacement during the first 5.7 s of its motion?

  A bullet moving horizontally to the rv6 k6/;jnp k5hhe/aeo1melc 1ight (+x direction) with a speed of 494 m/s strikes a sandbag aoh1kka/;e5 mnlh6 /eejp6v c1nd penetrates a distance of 52.07 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. It rxx 7lb)or v5ai57 t6kweaches a speed of 42 m/s at the end of the catapult, and this r lv 7atkbx57 )6w5rixoequires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves witigz 7th*8 wyh0h 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 distance of 200 m. What is its x8rqs qua*qnwd8)i4 zb0t)tz x beu,*w(46nxaverage accelerati )uebi8an *ur8xq, zq4)zw q6sxtwn40bdx*( ton?

  An object starts from rest and undergoes uniform acceleration. ivx ) vxp5r-h :n -:xfchv-cw2During the first second it travels 6.9 m. How far will i 2xvxf5-pn c )v:cxv-hw-r:hit travel during the third second?

  An object is moving in a strai),:enckdas7a;. zt uoght line with constant acceleration. Initially it is traveling at 1uoa 7t:d.en k ,zas)c;6 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly a8yp i2bkg.- rpb994rm eofzw 6t $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

  A car with good tires on a dry road can decelerate at abou/w7e+/ve qpmr5gl4 u+dyvx2gol5( ipt $5.0 \; m/s^2$ 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 has been waiting at thedh:s pq-+tm)k j3sa8i intersection starts a 8 ):-+jmas kshdipt3qhead 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 mbe4v6p k/ +n c*z.v rmmc)ws*planet X where the acceleration d */m .s+cwnr*czk mem6vvb)p4ue to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown 4uq:2pfzn* 1fe8yq upupward with a speed of 12 m/s on the surface of planet X where the accez qp8fuey* 4n p1uqf:2leration 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 the surface 8vo fp*5l7oojkwl8,/h b coun52ktf 3of planet X where the p55l23k,uh/k*oco88 7 tfvfnjbwo lo acceleration 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 m*72nc *xp w/c m5vlna rw(k,qon the surface of planet X wherenw 7*cnxm 5r,l/aqckmvw p(*2 the 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 g:ffa+x s-+bch 6jw6lsreater than 0.10 s. If your friend holds a ruler between your fingers and relealfw-hsj+c:f+ 6s6ba xses it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 ,ni6ag +k:y a nuf3v*zm/s. What is its velocity after 3.00 +vaz:,6*agnf nkyi3 us?

  A bullet shot straight up returns to its st68iyx/mdw0ma i0r(fh arting point in 5 s. What is the initial speed of the buif6 (iw/r dxy08hma0m llet?

  A ball is thrown straight up with a speed of 36.0 j*eg yxpcn* i244ht8b qk5l2qm/s. How long does it take to 8hk5l 4xntic qeb2g* y2p4*q jreturn to its starting point?

  A ball is thrown downward from the top of a buildo*7y66 v7pp 9nodgek sing with an initial speed of 20 m/s. It strikes the ground after 3.2 s. How high is the build7goeksvy dn*67p69 poing?

  A ball is thrown straight up with a speed of 30 m/s. (only; 8p9fl8hj-vn7v7duntl2 tdo fill in numerical value in ; od2vnp vjt79-ndl78 h ult8fthe blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up intoy;ov wgsdv+5h/ lc n(3 the air with a speed of 22.5 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the v68pf b8ar1vs3rif(fk elocity at t = 1.0 s?

  In Fig. below, what is the velocity axt9 s5*q amj 5y6hcqa*t t = 2.5 s?

  In Fig. below, what is the velocity gm j2r5rhd9-b at t = 4.0 s?

  In Fig. below, what is7nvy)sbh1. xob8 62a ,jvydig the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 t kg6r 7ux6 0bravrrs0uhh n(7;o 4.0 s?

  In Fig. below, what is the average velocity from 0 t j8wb+a*hx5iaoi5i2 o o 6.0 s?

  In Fig. below, what is the accsho3 og0im4v6p*o2ec eleration at 1.0 s?

  In Fig. below, what is sh* (raw359an kh73dbnmg2ae the acceleration at 3.0 s?

  In Fig. below, what is the average accelerationgg2+ tk wugs3upa.: -v from 0 to 5.0 s?

  In Fig. below, what is the average acxk6 gmqvf/v 88celeration from 0 to 8.0 s?

  In Fig. below, what is the displaa12 hq (gjj9 ct7 7ivco vs4rzzkx0e75cement from 0 to 8.0 s?

Does a car speedometer measure speed, velocityni32 1.rihiqt? {speed|velocity}

  An object can have a varying speed iioy98 doh5 ueie lf0l1zi* r1ekh(w:6 f its velocity is constant.

  The velocity of an object can be negative when its acceleration is pos (ur0q,cd ;kfsitive.

  If one object has a greater speed than a second object, the first must have b.5dd--cwf fc yra; y -mf7h30 /uvolka greater acceleratiod rw/y; fckvfbdua .-y3hm ol0-5-7cfn.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed 3* 9m(ojtsulhof $60 \; km/h$ 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 increa jmcb ks1w7wef2,m2h t)tx2b )sing in speed as its acceleration decreases.

  A baseball player hits a foul ball5+ho99sr ayle+ibd b: straight up into the air. It leaves the bat wib5oyl+b 9es+9:a hdrith a 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 happenie) wq89v6c givng to its acceleration, how does it change if air friction is igw8cv6i vge9)q nored?

  As a freely falling object speeds up, what is happenin1kkkd8;( nmbj9udia8fh/6uh 1qk qo (g to its acceleration, how does it change if a8qmh/i1(9bhdukuf6 k k(d oa8; jnq1kir friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its or; 0,m:qss /qlt xkjs3qiginal position with the same speed as it had initially if air resistance 3mk ;0s:q/,tsxs qqjl is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelerays3 fxa 5o (/(n-rcaretion at the same time.

  An object can have nonzero vel8f-9f m b/*cmkny, uqlocity and zero acceleration at the same time.

  An elevator moving from the se w t+((fajhs;twx s08ucond floor to the fifth floor making no stops along the way has zero acceleration all the timeu(tfh8w s ;wsta0(x+j.

  A rolling ball moves from :rjvonly0ea-k wn;3+ $x_1=2.7 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight qhy 7:klo5 x0dcomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.5 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 a4l+c4z0ntp7zfez;s:wg+1 l r/w1 efcm,cupf straight line, moving 103 m away in 13.8 s. It then turns abe +p wz; n1 smtp /1l,cr :f0uw4fz4gz+ec7cflruptly 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 fros(xbt w+pmxt f k7c,4/aj1yb q-3wvt. 1xxfe)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 fro,l0njx +dtuktm ,329)c eqhkmm $19 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speetr9tn x4xi69pfr73:+ dyleqy d of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially tok5(glswcrin 0r-wt8g7e+w4 8x ; c;si)tyrdc p speed aboutd; r0 i;gy788ccre+ 5k g)iws cl nt(rtww4-sx $10.2 \; m/s$ in the first 11.0 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 unia48e;vhu-u6 lev :t-z 0g9ux8qxyximformly from a speed of $19 \; m/s$ to rest in 5.67 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. Assumhjlf9aa(s(d j m7ad y6h:+5fk ing a dek69lfd7jd yf 5j(a hsaa+:h (mceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trumrmeb9fc 8.n776 qm vxck 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 com6g fkf1ori2y:rsci b -7i 12rhplete the 10,000-m run in less than 30.0 min. After exactly 27.0 minf-ryb7g2i1:o s61f rhi2i krc , there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$