Suppose that an object travels from one point in space to hy1::m pqhp2 g f(l7tbanother. Make a comparison between the displa bp7glqphf:t2h1 m y:(cement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous vel -o.:l hn9acsqu*39 6wcf ebbfocity?

  A new car manufacturer advertises that their car can go "from jqp ( qpuef(0wh229xm zero to sixty in 8 s". This iqpqm2f h 0(9p(xwjeu2 s a description of

  An object moving in the +x axis exay;xt 5pe4/ukperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down/g/0 h q:e woab*op,gk as it approaches a traffic lighaokbh gge*ow0, /p :/qt. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x di g)kj-abr7o lq.exfpjymvj .g +*+/p0rection) begins to slow down as it approaches a traffrv7.p/. j*yp )ok0qbmfl+g+ajgxe j- ic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocitymu+5jj uys.n7hj ewiw v5k75g v9x+4l. Make a statement concerning its acc5j5y4.wiv jg vun7hl+ j7+ w5m9kse xueleration.

  If the velocity of an object is zero, does it mean that thz-0 baizkg-z 0n-(5xt)s sqtle acceleration is zero? Support your answer--05)gz0-( zist qzsln kxt ab with an example.

  Can an object's velocity change direction when iggu. )xvh zj7hd jw)*v (,f6hsts acceleration is constant? Support your as)7xh)6dvg.wf u hg* jv(hzj,nswer with an example.

  Suppose that an object is moving with consta 0 tts8zu(2ola5zw6ciuv ,v /pbix5z/nt acceleration. Make a statement concerning its motion w6svi(lzpacoz5 wt u//bx2tu80 i 5,vzith respect to time.

  Can an object have increasing speed while its accelerationwc9k*qtk/x6pmy d 5e2r 1phd6 is decreasing? Support youpeyc* xhd9/5rp1kk6 w6td2 m qr answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of iag*bd k4l4ggg vm f+00ce. Make a statement concerning itsga 4lfb d*gkv4+m0 0gg acceleration.

  Under what condition is average velocity equal to the average of the objectl3,zii6)ywsees8kxpu 7-+ gw's initial and final vep6swk)83ux 7e +islgie-zwy ,locity?

  Objects A and B both start at rest. They both accelera98 j bgml)piw)vi8t7pte at the same rate. Howevelm)i ij v7pb8 9gwt)p8r, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. T l22j4u9ny 0qgo(;hp ngzjg:nhey 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 object B;0lzh 2gjo9 g(yj2q n:ungnp4?

  When an object is released from rest and falls8) hqpjje 7ixm98u kw7 in the absence of friction, which of the following is true concerning its motion?k)we m988x 77pjhijq u

  When an object is released from rest and falls in the absence of hpr36wer6qc; friction, which of the following is true concerning its motionehp 3qrc6 ;rw6?

  Suppose a ball is throwe/1:9 lfyk wp9z* mqo. rv0ehkn straight up. Make a statement about the velocity and the acceleration whe 09v9 :mpkkoezfe1*qhl. r/wy n the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleraxex2)t6b hvc/tion just before it reaches et2xxc6 vhb/)its highest point?

  Suppose a ball is thrown straight up, dokh6s,ub25s33c8i vqaj b z 3htb(n kco+28rreaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as th ud a832z8cokin h3+(325hbcvok rb sq6j,stb e ball is going up.

  A ball is thrown straight up, reaches a maxid-,qj6lcp, ksirr i,2sv u9t0:v(we gmum height, then falls to its initial heightg iri6qwvtvc-, 0k9pe:l2urj,s,(d s. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistatw/itw3m5 y1idn* 6wmnce. Make a statement 6dmmti1 nwt/ww y 53*iconcerning its acceleration.

  Suppose a skydiver jumps from a high-flying planlid.tp btu onn5;6t92 e. What is her acceleration when she she reaches terminal vt 9b.idtu2 ntlpn; o65elocity?

  A ball is thrown vertically upwd) qw(w fgk e:cq+,fm3ard 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 them3,)f g+q(ekww c:dqf 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 from3 warw8, g4 hjbz6fs-y the top of a building. One second later, ball B is dropped from the same building. As time progresses, the diy8,gw-6rf wz j4ah 3sbstance between them

  Ball A is dropped from the top of a building. One seq tvv-wm9mkjtk,)ir8bbvk47c 7 ke3 5cond later, ball B is dropped from the same building. Ab8rjv m i75kbkk-)v3t mw, qct4evk 97s time progresses, the difference in their speeds

  Two objects are thrown from the top ofc)o8 juvbor2f y3( ;d:vnrcbef(*x; f a tall building. One is thrown up, and the other is thrown do(8fev;dj: nfr*rcfx( y u;ovbbc) 23own, both 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 bric9:kw be(edaz-, 3ejcsi8 r gl)q+s /spk is thrown straight down from the same building. They are released at the same time. Neglect air resistance. c pj-z w+/ees:ad83, qrek s(gl9)isbCompare the accelerations of the two bricks.

  An object is moving 5, o3g7au i1otdro 8mhr/-xxi with constant non-zero velocity in the +x axis. The position v5u3i-gmo,d /1xro h7aoxitr8 ersus time graph of this object is

  An object is moving with constant non-zero /c4yvm09wrziie4o 9 pfgy*:y acceleration in the +x axis. The position versus time graph ofr:9zp vyy0i9 ymwg44* /iecof this object is

  An object is moving with constant non-zero velocity d5f jy-wa1;g2- aayvl in the +x axis. The velocity versus time graph of this objec-w yjyfag1;da 2 -v5alt is

  An object is moving with constant non-zero z 0jcmg2;b9o1)rp7,+g-kbx a gx 0wixg 6ndmeacceleration in the +x axis. The velocity versus time graph of this object isbxemxd)g1mz ggi0j70p n+rx 2;,akcg 9ob-w6

  The slope of a position versueoi6 iqrk1i5id, vy d-3gl;/kyl2 lh.s time graph gives

  The slope of a velocity versus time graph i4* 3wrn5vl azc7qp0 zgives

  The area under a curve in an acceleration la5w(2r.)( c.8 fuugej dxfsaversus time graph gives

  The area under a curve in a velocity versus time graph givesja kn( 7 rbqc s(5wma780,srv b:n1iht

  If the position versus time graph ofr9o0 k qf7ey-m5cxcd ( an object is a horizontal line, the object m oc xqkd5cr 09(-e7yfis

  If the position versus t3: gv:smf /ybcime graph of an object is a vertical line, the object isvy m:f3/cgbs :

  If the velocity versus wtb90b:2yn6t:tu cwa time graph of an object is a horizontal line, the object i2:w cw0tb6y:tt9nuba s

  If the velocity versus tiwyx - )( dp2 ry;w9acf( fjb7kpb,gg0lme graph of an object is a straight line making an angle of 30 degrees with the time axis, tfbkjp)y ,;xp0r2lf wbw7a cd9-(yg( ghe object is

  An object moves 15.0 m yxndk 2 m7s7t*north and then 11.0 m south. Find both the distance travelexn2m t*k77 ysdd and the magnitude of the displacement vector.

  A boat can move at 30 km/h in2v4budl * mmxsr3 8v,pvl)+mi still water. How long will it take to move 12 km upstrr3)bv *x dm,4mv8s +u2mllpvieam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =n660ee8t ofh y 1609 m)

  What must be your average speed in order to travel 7pg32g6r kqen350 km in 5.15 h?

  A runner ran the marathon (k(31+rk:+growuqvo k approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runne:vk1+o(qrk 3+krguw or in m/s?

  A car travels 90 km/h. How long does it take for it l qi.i 7ruj ;/m1no1qdf qlg-f*+u7pn e:hzy 8to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The /04ppu-)*si (xjg2yjfkj . nyof1wocspeed of lightffu0y* n/g soyw.o (jpi)x4jcp -kj21 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 aip6y2*jfyp jmmw j,a55v- eg9nd you look to the side for 4.0 s, hof5mviy j,y9ga* 6 pe-w mjjp52w far do you travel during this inattentive period?

  If you run a complete loop a2 , g)bs7.rbxvv zk1xsround an outdoor track (400 m), in 100 s, your average.bvzvs1gb )2xsxr7, k velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km njg)cxme;n ;z+ker 88nyb z8)east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 minz my8 n)8engb;nj x8+;)rezkc . What was the bear's average speed?

  A polar bear starts at the North Pole. It.q ki(irs(, nxbfri:dn/) 4zl travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its startingz.)n/ b( k4iflx(nrid ,r: siq 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 mil2 j;) fe;;1fqtwopolpdxhin+ r s+3;8f ko-rves. It then starts to snow and you slow to 35 mi/h. You d +r f;;k-tjqh)efv;2 pi+r x swlp;n3o f1oo8arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/v5.70gr0vhhfo3d l knj0k c5hh. What is the average speed of the motorist for this57g0v 3j5hvrc h0h l0.df knko trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her b8en-1dyp/ q yaverage speed f - np/qb1yedy8or the trip?

  An airplane travels at 300 me yz4fv xcs h7i2e:4i4i/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed fheiv47c2i4z:ys f ex 4or the trip?

  In a 400-m relay race the anchorman (the p4 codg,)zccv6 erson who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead tho cz4v)cd6g ,ce team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly andrfm 8 f (;jg*1;zsvvxc comes to a stop after 13 s. The car's average velocity during deceleration was 36 km/;fszg j;c 1 *vvm8rxf(h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of f4 eh(a(kx)7nurc1wfj czp 5:wc rh51pe 7 :nzcf()ka jf(x4u$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accele4zg i )dpj/3cc sh24txrates 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 r:nd kwgzs5b2( up,jd;est and accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/sl a)dk(8-. med.daglm for 10 s. It then speeds up with a constant acceleration of e-d. m.(m8kd) llgad a$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.6 m/s experieg; nqqaj8m )yiofy y)j-8:xz/nces a constant acceleration of g x;qq8)iymjo n/jyfy -: )8za$2.6 \; m/s^2$. What is the cart's displacement during the first 8.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 319 m/qpctz+*(hs/v; 5mxq; u bi5h ms strikes a sandbag and penetrates a distance of 48.40 cm. What is th;h5it 5q*;u/s+ vbm zpcxmh(qe average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapultq wgk ;gz*smuhwx) ;-9 on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2. wg*u9;xm)k;gsw- zhq0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant ac ucickv;q0b+:;ljd+ cb( lb9lceleration 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 aveq06jv5sej wr; oh3of 4rage accelefhj 564rs0eqojo;v w3 ration?

  An object starts from rest and undergoes uniform ac pjbjdl5xm-/k8a k lmdm .a* .xy+ qhc67)a;cjceleration. During the first second it travels 2.8 m. H6kdja k/7+ lahb- qx;mpca8cld5y) j j.mm.x*ow far will it travel during the third second?

  An object is moving in a straight l7/es,c: v wkdeine with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later itws c :,e7dekv/ is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformlyz-zv5c 3x2zl p 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+ rhl f a)u+ v0:kwjw2tgo0x4jm1dq /rate 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 gdzwtr sclt86f c6v:/ ll49f6l8yqok, reen, a car that has been waiting at the intersection startw l8/ zlf4docfk6v y tsl69,6l8qr:tc s 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,:,*lcxb -thsf. epovj r3e*q surface of planet X where the acceleration du ,*r-t.ph j:lexqo ,*vs fc3ebe to gravity 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 surface of planj. i ,5jy 9wv71-judrzu ht1 ;pcj9hryet X where the ay57 hd ,v1yj pcuj.;jr-19 i9urhztwjcceleration 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 sptr xh;4* djgkr7j+k//mw8 dm h2ft4 mpeed of 15 m/s on the surface of planet X where the acceleration du*whtkgj m4k2mm8r4hf +x jdpr;/7/ tde 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 uuej w esx3/)3upward with a speed of 14 m/s on the surface of planet X where the acceleration due to 3se/3ux e uj)wgravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10renv yn g)8o4obza1.3 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ru.zn 4 b)8naovoreg y13ler to fall before you catch it?

  A ball is thrown upward a3ia; .pg5,z bvh 7 geayal:yf)t a velocity of 19.6 m/s. What is its velocity after 3. a.l7:z;yghf e a v5abpg3)iy,00 s?

  A bullet shot straight up returns to its starrr/al:u 95l,sb 7l conting point in 12 s. What is the initial speed of the bullet?brn75/olluars:l9 , c

  A ball is thrown straight up with a speed xn :0d8u(0ux hao(pgwof 36.0 m/s. How long does it take to return to its starting point?: gu( hx(d80u0xwaopn

  A ball is thrown downward f57gvv c76 gws6j h w(ukg;0evyrom the top of a building with an initial speed of 17 m/v7c g vyg60gu5 w (;hejv6s7wks. It strikes the ground after 2.3 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fillhm .jye*0)8l iz;rump in numerical value in the jhlre8 m *).muyz 0;ipblanks)
(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 m.)c vvcgbum4**t 3g9n tdfp4of 45.3 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 2 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 velocity as-g:0 rvpa j7nk4(cf ot t = 1.0 s?

  In Fig. below, what is the vel-)vq(jrw hq;i0tf:j locity at t = 2.5 s?

  In Fig. below, what is the velocity at thwe/5ix9m,7 l 16 suykwi/pne// dxe s = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 cfx7b6h45wq d cs-n-h s?

  In Fig. below, what is;oxsda6xb-lpx77 rg q2t 2 vp) the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from ,lftz:5 pv w+tsat3t 30 to 6.0 s?

  In Fig. below, what ,2- 5 fkjx3vjyyl.0 iabyd,agis the acceleration at 1.0 s?

  In Fig. below, what is the 5kh(.whdp f ffi853fnacceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0impp ip4m /-4kk3p4zx to 5.0 s?

  In Fig. below, what ivjm1j f z:p,:bs the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displaw4nnao,n,6y )wn o l0ocement from 0 to 8.0 s?

Does a car speedometer c zpzw -v2av ,(cz,t-bmeasure speed, velocity? {speed|velocity}

  An object can have a vam )xts1g102f e 4uyubjrying speed if its velocity is constant.

  The velocity of an object can be negave45tw9wfrai :/xc :f tive when its acceleration is positive.

  If one object has a greater speed than a seco ul3z2 r, xtp7njx o-0ryoo8i+nd object, the first must have a greater accelerax8t oloxj,nry+-oi73z 2 0urption.

  Two cars emerge side by side from a tunnel. Car A is t i7++fxqgmma1ra8yo:okddc xb ni+t 464yf65raveling 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 acceleraw-n+ b4*s0;rx ym st3beie)g ytion decreases.

  A baseball player hits a foul ball straight up into the air. It lpj:)2j ,ggjpreaves the bat with a sjp jgjg2 p:),rpeed 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 a3*5yzfdoa11c1 tp(w* zj b1a i una+nits acceleration, how does it +1*faua d iyozaznnt(3w c*jpa1b 5 11change if air friction is ignored?

  As a freely falling object.c: woe )bd4gpcm ,c3k speeds up, what is happening to its acceleration, how does i4me) dk3 c,.ccgbwpo :t change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its ori.dw1qf;ljwcd/n.ok s0ha82 iginal position with the same speed as it w w10.sq/fj.dkincd8;2 loh a had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and non2d7nlo* -bq-i 7cozagzero acceleration at the same time.

  An object can have nonzero veloc m9vx2t2n+x:9mtn mfjity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no sti qce4csn3dk7s8:zr7)p hfuzy 0*s7 rops along thrk8sq *7 ie4 cs7)d0nzz:rspu73c yfhe way has zero acceleration all the time.

  A rolling ball moves fnvqz6 0.hfqouz+ f0k0rom $x_1=1.9 \mathrm{~cm}$ to $x_2=-7.1 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ 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 $t_1=-2.0 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile (pfx c1bhejcd(.a vn0r)zu8; ($1 \; mile = 1609 \; m$) track in a total time of 7.4 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 91 m away in 13dlsh,*gu/8d rx-j ijmfil8u3b2b b 7/ .6 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its afhs782/b*j/ux jlb,-mblu d dri8 3i gverage 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 frq-ue0i/inpr l gq5d7 -om $11 \; m/s$ to $23 \; m/s$ in 5.8 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 n9jpd gt2f7qah/w; -n$22 \; m/s$ 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 sphm-*ii )m 3kre4gkkm;eed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top spe/ 2jak xa:a tpp+wnt:+ed aboutaaxj2:+ w k+ntp :/tpa $10.9 \; m/s$ 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 speed o4el)inq- 0f/ ,ziwndyf $21 \; m/s$ to rest in 5.66 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 highwak4detweegiw b 706/s8 y. Assuming a eesdkwbe47w g/ 806tideceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck dh06 9yxz ).bckbrtc- o.d;t ygoing $25 \; m/s$ 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 min. After exactb q :-gajuw9d7ly 27.0 min, there are still 1100 m to go. The runner must theju:ga bd9 7-qwn accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$