Suppose that an object travels from one point in space to another. 29 zqqw i+pbxru7wom7(0,tgjMake a comparison between the displ p2i9w u 7o,+xrzmt b(wq7q0gjacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity?v8iva v+wa60g

  A new car manufacturer adver 8yxhbogq03c msl35; jw-vs m+tises that their car can go "from zero to sixty in 8 s". This is ;ogmw5-l 3s0 qx +y83mcjhsb va description of

  An object moving in the +x axis experie6.atssfvf+i5qm e.y 1nces 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 slo fo+kv qft)r43w down as it approaches a traffi o)vqt4f3f kr+c light. Make a statement concerning its acceleration.

  Suppose that a car traveling to tc)u-)ooi. 9tf*6p g1dh:zht trwull2he West (-x direction) begins to slow down as it approaches a traffic light. Make a statement -. 6 tdtor2uzhlg)1foct u9 ):wl ih*pconcerning its acceleration.

  Suppose that an object is moving with a constantv gw/y(:gfov 3:lwr 8n8h t5lu velocity. Make a statement concerningf t:wvlr83: onywl g5(8/v uhg its acceleration.

  If the velocity of an object is zero, does it mea1:9 xl +9egl8tfhyaw,p xb3h cn that the acceleration is zero? Support your answer cl3b p y,xh1+w ea:fg8hx9 9ltwith an example.

  Can an object's velocit1 43qnnxrwlmm0t s p0(jzo(9; kc n7vly change direction when its acceleration is constant? Sun0w p ;ktx4z0 9lmc 3(1(mn7orlj qsvnpport your answer with an example.

  Suppose that an object is moving with consxip3u 3zcr7 ye:d kw807pg( nvtant acceleration. Make a statement concerning its motion with respect to :p83(rp7nd0 7zwigkuevcxy3time.

  Can an object have ipq.iffq2 e39ge7 mcc fd09i o:ncreasing speed while its acceleration is decreasing? Support your answer withg2fm e c qif.39c9ep:d7fqoi0 an example.

  Suppose a can, after an initial kick, moves up along a smoothw mzl f9h.;/c5tw s5vha;pmj2 hill of ice. Make a stateme9m;sch/.w5 hwva5t;2 zmpfljnt concerning its acceleration.

  Under what condition is average velocity equal to the average of the obj uz4qhh5 yv/t*5aypp 0ect's initial puhv0 * pz/yty45haq5and final velocity?

  Objects A and B both start at rest. They both accelerate at the sand0 :oq3 qzal* 6m+5q(n ahurhme rate. Howevn :oulh6 *+ram5 q3h0qndq (zaer, 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. They both accelerate at the same rbbw2tb .9nbur4/vcx:ate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared vtbn b/x2b :u9r4.b cwto that of object B?

  When an object is released from rest and falls in the absence of frict)py0wl78djecmk9k1x ion, which of the following is tyw9jk)e7dm0 k c1xlp8rue concerning its motion?

  When an object is released from rest and fallsz9c o9+3 jmlvw in the absence of friction, which of the following is true concernw9zvo 9m3l+cjing its motion?

  Suppose a ball is thrown straight up. Make a statement about the veloci vpkw7u j.sk(3ty and the acceleration when the ball reaches the highest pointvkk7.upsjw ( 3.

  Suppose a ball is thro qr.a.vg 4+x8peibik5wn straight up. What is its acceleration just before it re+ai45bq.xegpv8k r . iaches its highest point?

  Suppose a ball is thrown straigh) q,te.h3 zx*oru(lu bt up, reaches a maximum height, then falls to its initial height. Make a statement about the dr3)x,ze( lou.htub q*irection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heighi:ciz,kq - 8 2mkhrx4fjb,ag0t, then falls to its initial height. Make a statement about the direction of 4ih,fr8b-k2mc k,:xz a0 jgiq the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a sblm a753575onjc : xieabmje*tatement concerning its acceleratlbixm 5nje a7jm55 bac7*e :3oion.

  Suppose a skydiver jumps from a high-flying plbk(ub6nau1w70 d9no fp)g+ x aane. What is her acceleration when she sheg wan b0uxaf u9nb17o()6+pkd reaches terminal velocity?

  A ball is thrown vertically upward with a speed v4f e5 :vciz6z0psecq.. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height oqec5:zfse .4v 06zip cf 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. One second lat,5qro lpg)ad9y) khd* 3jk0 eoer, ball B is dropped from the same building. As ti qdjrp5eo903,* h) )o kglykadme progresses, the distance between them

  Ball A is dropped from the top of a building. One second laaw;g m:9n5u1*5thqeyhp y8 x ater, ball B is dropped from the same building. As time progresses, g*hmy h9a x tn:ew1q8a5;y5 upthe difference in their speeds

  Two objects are thrown from t( w(sgj p+w2bs+3vx fvhe top of a tall building. One is thrown up, and the other w+wp( +g jb(fvv 3xs2sis thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from l-rb4pno lt:(the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. C(rot-bpll : 4nompare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The bfkl 5px2 yf,5hs pb29rw-/p lq.ewi*position vexpe2-iw/ b9 p,l5 wq pbrf.2shl5fyk*rsus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x a4ty9jxjv 5o-d0jzf d2xis. The position versus time graph of this obje54fzd0 xd-j jt vj2y9oct is

  An object is moving with constant non-*n q(d mg)h ,sfy8wv2jzero velocity in the +x axis. The velocity versd)q* j 8h(vmfgy2 nws,us time graph of this object is

  An object is moving g3 cjff,1(co clnvhn96 pe8 m4with constant non-zero acceleration in the +x axis. The velocity versus time graph of this o nnlgcj18pfmfeccov4, 6h( 39bject is

  The slope of a positionswl-x + u,85 xx9buloi versus time graph gives

  The slope of a velocity versuwd.(8kxx. ioglj s/.u s time graph gives

  The area under a curve in an acceleration versus time 0, +vegbdy f*rgraph gives

  The area under a curve in a ve0q(dcrz; -b zxlocity versus time graph gives

  If the position versus time fx6nc 7gik c)o(mt .v+graph of an object is a horizontal line, the object ismcv 7gct(i xnf)o6 +k.

  If the position versus time graph of an objxel0jodtqs73 9 z5iz7ect is a vertical line, the object isj 7d tei0l37z9z5oxqs

  If the velocity versus time graph of an object is a horizontal line, the ob6tkfa6jvek02n kx; .n(r k/*umx yq(fject ij2 k k(k nr*qk/(x axf umvt0ynf.66e;s

  If the velocity versus time graph of an object is a d) u u-7j2bj(w ej//g p/pysggstraight line making an angle of 30 degrees with th)(ujb/su 7 /gp/pge-yj jw2gde time axis, the object is

  An object moves 15.0 m north and thedqgyazh ; np (ua,cqih43 xv5g/+bn)-n 11.0 m south. Find both the distance traveled and the magnitude of the displacemen)q4hicng n(+ba-u3;dy,hv 5a gp/zqxt vector.

  A boat can move at 30 km/h in still water. How long will it 4ielk)k t3zi,5. k1 itbd0/cg rg u;vqtake to move 12 km upstream in a river flowr)b gt 40ecvdi /3k,1gkii.;utz5lqking 6.0 km/h?

  55 mi/h is how many mf-r6j7;e ni f7q nj0u*wvh;z d/s? (1 mi = 1609 m)

  What must be your average sp roimo1z(s/0c eed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (appro* ehs2v)ug :4m.gd lhwximately 42.0 km) in 2 hours and 57 min. What is the a) : 4lhe2wmdvu.*ghgsverage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it tohdy a *snc3zr:yygmse13 /kehat;:4 - travel 400 km?

  A ly (light year) is the distance that light travels in one year.u/t hesd ) :9l9xxgm,lz xz0*n The speed of light ix n 0:m*9l/zel9)d,xh stx zgus $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you look to the side for cc3lvrgd+l .-a o u:.2+s0w0rqgl ch z4.0 s z 3u+ accowdl.vs.:00-q+g cgrhr2ll, how far do you travel during this inattentive period?

  If you run a complete loop around a8/znxr+:-s pez;qt s un outdoor track (400 m), in 100 s, your average velocity i: eqp /szz-+s xn;urt8s

  A polar bear starts at the North Pole. dx)a0;t.y oir/n6 h7ip fukn-7le q 6aIt 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 wa;0pu7a6eo t7idfa 6n/niqxy.hk)l -rs the bear's average speed?

  A polar bear starts at the North Pole. It tra j4*;hl 8f5jli .a ygv-br wd-;pxc3ywvels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west tjd8-yyl3f-pl*; acighw jw5vrx;. 4 bo return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110jyd: p0a4izj-,a r)ly 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 yp : 4,0r-z)jyaidla jyour hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the avepxe35 uozy0n u)j z5qnb*0;kyrage speed o0e 0quypb5)zuk5n3y*x;zoj n f the motorist for this trip?

  A motorist travels for 3.0 h xp)qe+*ptcv 2vpn 2)h at 80 km/h and 2.0 h at 100 km/h. What is her average speed n2 p pc)vvh+qx*te2 p)for the trip?

  An airplane travels at 300 mi/h south for 2.00 m wilm ;s 0dvq0q6z735g0gu6v qfibr)h and then at 250 mi/h north for 750 miles. What is the average speed for t s vd0u;g0f6q)qi5r7miz03 m q6lw bvghe trip?

  In a 400-m relay race the anchorman (the person who runs the ,zd*((ppa qhblast 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 thata( d,b *zqpp(h the team A runner not lose the race?

  A car decelerates uniformly and comes to a si:wga;qz fa8q r39mo. top after 9 s. The car's average velocity during decelerat:qqwfam ;.89o zir ag3ion was 50 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 16-: ps;18hfaihhi -b8fh hyv7c0 m/s, at the average rate of apiv:8i1-fh7y ch 8-hh;hbsf$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratm:e2ll gb zu.ksxsb;g8 6z:9 kes 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 andrrw7am;yc 6f x/54n6edz0w;r q-mglm 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 uaec40 6i)ijc2yx/4 drcc 4 juvp with a constant accelerationa6cy4 jc44vccuri/0 )idxje 2 of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.4 m/s experiences a constant acceleraypol w.wm /n93t7rf o3tion o3 7rwflpmoot/w3y. 9nf $2.1 \; m/s^2$. What is the cart's displacement during the first 6.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 2 6oxpm r3*p z4tmdz()u49 m/s strikes a sandbag and pem3o4(t6u *pxdr)zpzmnetrates a distance of 37.18 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is 2b 9p:l0f gagln:sf5w launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at th0:9ngfsl wb:a52 lpfg e end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleratitld1)gozgjz3*ax f2gf6y ))5 ocf lj1on 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. W/5hho( srxj avm u204vhat is its average accelerr24/sahovmhj0 5x(v uation?

  An object starts from rest and undergoes uniform accem46nuv :m vz6vleration. During the first second it travels 4.9 m. How far will it mvv6mnv4 u6z: travel during the third second?

  An object is moving in a straight line with constant acceleration. Initially,wy 87low et/qs*hd0c it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s.odw78e*0whcy tq/ ,l s How far does it move during this time?

  A car starts from rest and accelerates uniform.ek8brf : )gw.x.r2v:dku c r rft)un+ly 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 decelerate at abouee 1p7l :nbg2yq3bh9m t $5.0 \; m/s^2$ 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 ligh8o7-g eunp h8dt turns green, a car that has been waiting at the intersection starts ahead wh88o neu7gd p-ith 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 .xo+ji mop : f1tl,:) iph;qdlwith a speed of 12 m/s on the surface of planet X where the acce+:i1;)mx lpl.iodqt :pohf ,jleration due 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 ofiq/ u,oh x nfx:vs)mp( ;d/zr) 12 m/s on the surface of planet X where the so)/h:z/xmv xir()q;n dfpu,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 zb5a t:3bc3.mm ukgqv*(vkc5 upward with a speed of 15 m/s on the surface of planet X where the acceleration5zm3g3: mtkckav.vu 5(c*qb b 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 ( of4uo,ya:r:(zpc bjwhere the accelezca 4:u:r, ((pyofjboration 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 hof/x jz*8gi f7klds a ruler between your fingers anfgzi7f j*x /8kd releases 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 wa1)r*f lh 6wp2b sh3vruk)53z) mxso 19.6 m/s. What is its velocity after 3.0k)m )f xr5*shaohwb62vp1l)3 rus3 wz0 s?

  A bullet shot straight up returns to its starting point in 13 7-1q 8 i qodpfy4bi+gytzx4 ql2+ewi6s. What is the ini-8i 1t by4o2gw q7ifq6yx+i4zp +deql tial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. H6jdjbd (a/ tqjql **ro4 g+vq(ow long does it take to return to its st 6dobqtrlv4j*qqj( /a+jd*g( arting point?

  A ball is thrown downward from the top of a building with an initial speed of 27(/; 8n;z ;dconoh 4ga hrfrd380kt ;at+qkcfx m/s. It strikes x;o /;384 naft 0;d(rk kzfctqgch;d8ahnr +othe ground after 4.5 s. How high is the building?

  A ball is thrown straight up wqnm(cv)mp6c h c6g) 7a)u09ciyklz 7 with a speed of 30 m/s. (only fill in numerical value in cci)kg6zq0y6)mm7la(cpc) 7wv9n uh the 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 into th/*t c afixfd;wa3b7m5 h 9a9 y5,iertre air with a speed of 37.4 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the dyjjp) c3qx: 6/ (abbevelocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5xqss) b;ic .4r s?

  In Fig. below, what is the veloci:3az aklll 6 /t*bvs7rty at t = 4.0 s?

  In Fig. below, what is the vsvurmd.x j g*ys5h4.+yu +t/helocity at t = 5.5 s?

  In Fig. below, what is the aver)m( zxbdm g06gage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fnk+yi; sj+l 8trom 0 to 6.0 s?

  In Fig. below, what is the ax 4c5 ydqnnla3m 6ialz(o5g/5cceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 o. *ojejxr;8a s?

  In Fig. below, what is the average acceleration from 0 to 5.0 am55vvd iw zozf.6/y 9s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s?ye2h u/nny3*w,lq .ovbc4)na

  In Fig. below, what is* zk.o5cg7aor0l77t a ybvt0mj9 xo 3l the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {p8f 6d- gmufb+speed|velocity}

  An object can have a varying speed if its velocity is constau547rhb /qqfypth., z nt.

  The velocity of an object can be negative when its acceleration 33 xyg/:xhfm ;xi2si p-s-f/l eq83ljm ptg2tis positive.

  If one object has a greater speed thamuf5u zl2+s,e8lyk c2 n a second object, the first must have a greater accele zu2k yu,ml8sc5fl 2+eration.

  Two cars emerge side by side from 5sk6dp l 9pmu9a 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 incre :72ne0imr+w6dxxq ir; gk8flasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leav/0 0 jkj+/z xhx3g lf;b8tssqyes the bat with a sp0t sh/ yz3sg+lj8k q;fxx0b/j eed 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 hap9 n- l7:bkkxe-gvva0lpening to its acceleration, how does it change if air friction is ignorel-k-nel90k :vx bga7v d?

  As a freely falling object speeds up, what is happening to its accuobsgw+t) :n/ x s.ch: )2vpdwul4/w zeleration, how does it change if air friction CAhcw //lt 2w.:d+zpu)guov)ss 4bxw:nN NOT be ignored?

  An object that is thrown vertically upward will return to its orin0migq8 thnr6(ox .- iginal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will h 8 m 0t-r(qin.oxn6igthis result be altered?

  An object can have zero velocity and nonzero acceleratio/x :/.ccejbfoz..dpu rop/h;n at the same time.

  An object can have nonzero velocity and zero acceleration at t3 hx n3;ltnfhvo 60*x4in;h wahe same time.

  An elevator moving from the second floor to the fifth floor making no stop2xa87k exq,s1pj dmb28 g;nswo9,c wzs along the way has zero acceleration all the timwa8;7xw2 zjbsm,8pdqe co sn g,xk192e.

  A rolling ball moves lkzp 3p5 )cc9cpn l2 oq4n(fgcg)9+fc from $x_1=2.3 \mathrm{~cm}$ to $x_2=-4.8 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.6 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complet qro+-4ap,+w6ou eegze laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its tra,t:zw1i;thgmk3v 4*2 ils.zjo m k9rpiner in a straight line, moving 104 m away in 9.3 s. It ths*1tp:k; l mzm34jhv ogkir9 2,.ztwien turns abruptly and 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 fromra(kj1 , l 5q7)rwcryg $11 \; m/s$ to $25 \; m/s$ in 4.9 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 dnccn86jp(q4f *ur6 -wkvdml f,)h7lm $19 \; m/s$ to rest in a distance of 66 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed oaqmg0 /m r0cu9f $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of tmw 9u 3 a)7fgabf0*knfhe blocks to essentially top speed about 7 f39bmw fgf)0 n*kuaa$11.1 \; m/s$ 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 vz8p:t +9 velw- :*b pqhezx:ispeed of $16 \; m/s$ to rest in 5.19 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. Asqdz+wi+pr bf4 wl oy2vky*2. 6suming a decel2w4r+*w.z +fk o yipdqvy26 bleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gd8( xxyj2 p1tf8n 7nqvoing $25 \; m/s$ 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 17,cgt x(wqk 2kv -ts.eflu9:z0,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner ms7k, ec(x.-fqkvgztw :t2 9 ulust then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$