Suppose that an object travels from one point in space to another. Make a8(v6xsq uf3n m comparison between the displacement and the distance traveled.xfq63n(v msu 8

  When is the average velocity of an object equal to the instantan s,/fce,kd(hn7z8uj neous velocity?

  A new car manufacturer advert2 c ns/fld*)cqises that their car can go "from zero to sixty in 8 s". This is a deccn2 )fsd q/l*scription of

  An object moving in the +x axis experiences 4ael; dfagv7jo; j(;nan acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+yn2*sx - ;icnqx direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.q-nsi *2;ncy x

  Suppose that a car traveling to the West (-x direction) begins to slos+ u *cd-; kpig/ uz0yr j*l9oszip(b3w down as it approaches a traffic light.+z yd lis0bz*pgisu/pk;9 (j- u3o cr* Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. ktvu/5fuw : 3k*:hxre Make a statement concerning its acceler uwuex5 tv:kk *r:hf3/ation.

  If the velocity of an object is zero, does it mekfwfm4i08u hu :+. akaan that the acceleration is zero? Support your 4kw ifa :a0.8m+fh kuuanswer with an example.

  Can an object's velocity change direction when its acceleration df5f*0n vezdjqliq-08 n3cf8is constant? Suppn nfc88 3-dl*0qzdff5iqvj 0e ort your answer with an example.

  Suppose that an object is moving with constant acceleration. M1s b*f:8jt;butf ztbiup**t 8ake a statement concernf bbpfst t*b ; 8t1zu*i:j*t8uing its motion with respect to time.

  Can an object have increasin3m agkw5;kbob ,lv21bn )y8te g speed while its acceleration is decreasing? Support your answer with5,m nok)tb2e8avw b;bkgy3l 1 an example.

  Suppose a can, after an initial kick, movex 8 z63guo,3u9fc+j:)ye jtxab rukr2 s up along a smooth hill of ice. Make a statement concerning 3rz+:xu bag8 oyj , 2ue6r9ju 3)cxtkfits acceleration.

  Under what condition is average velocity equal tq* k g)u4ksit1o the average of the object's initial and final4isu1gq* t)kk velocity?

  Objects A and B both start at rest. They both accelerate aaoa*yvei. z+ fe4k-s(t the same rate. However, object A accelerates for twice the time as o*a azv(. +eesf4y o-ikbject B. What is the final speed of object A compared to that of object B?

  Objects A and B bothd,elghdjx2n w(vl w+a0 x7g4; start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distanwned27xl, xwl(v4d0h g; g+aj ce traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence hk e;8 br(nbc r6j8.3j)gx4t( awe bdsof friction, which of the following is true concerd wcjb (; ej().sx6ntrgk hbrab834e8ning its motion?

  When an object is released from rest and falls in the absence of friction, which:o.q jm:l1 6fevgsb+g of the following is t+lb:fm6ve1 qjs.:ggo rue concerning its motion?

  Suppose a ball is thrown straight up. Ma3 l qix4j(dm zrv69i3yke a statement about the velocity and the accel qdyivjm4z6il(r93 x3 eration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What iof(x(ed)lad8dm h )1l( hes(c s its acceleration just before it reaches its highes)dl)meh8cxe o (l(1 fs adh(d(t point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls yklch :k2 0equ)zlywaj k-guf5- h5- 5to its initial height. Make a statement about the)y 5 h- -5 g:yuh0lf5kclkezwka-2qju direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, t1cl*clgzj(. i7e g (x2t :w,fnzg9wdnhen falls to its initial height. Make a statement about the di(:xccwn*,2lwggt1 e (f dlz7i9.zgj nrection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the abseg+vp 5 2ela.tsnce of air resistance. Make a statement concerni epl5 2.+atvsgng its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is tihoztzjoj(b 1r:j( c3h)zkj v -6*+zher acceleration when rooj j+)kh :zz(z*vjh ji t(z-c6b3t1she she reaches terminal velocity?

  A ball is thrown vertically upward nvc l17dh .+1)tt4knk714 ynmv hniimwith a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). Whatm+v4 tmknhn7n)iv i4d.ynt h111kl7 c 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 buildinggg s0k g:8d6mgfl35d ptqolqjq6 .-6g. One second later, ball B is dropped from the same building. As time progresses, the distance betwt gk6q.fs68o-m3q gj6g5pql dg g0 l:deen them

  Ball A is dropped from the top of a building. One second later, bfrmfmexf,i:-xyjw* 0 *1)ow rall B is dropped from the same building. As time progresses, the difference in theiy ) 1:w*ff *ir-,jmfxrxme0owr speeds

  Two objects are thrown frol,ihlvz)m 6y 3nsjl 91m the top of 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,l3jv)1nsm9yll zh 6 ieet?

  A brick is dropped from the top of a building. A second brick is thrown straighrwee l lnb-f/x2j;/9ht down from the same building. They are released at the same time. Neglect air resistance. Compare the-/ej92 nh /;wefxlrbl accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The posit m nc3hazz9l b34g6wm1l9hkfj 4i( g0vion versus time graph of this objech 96fj lmi9 b cg lh1(zv4w4an3m0g3kzt is

  An object is moving with cozok )9l-u) pfinstant non-zero acceleration in the +x axis. The position ver9 k-)io)zpulfsus time graph of this object is

  An object is moving with constant non-zero velocityjj ks2,rsob 48 in the +x axis. The velocity versus time graph ofoj2k8bs sr,4j this object is

  An object is moving with constant non-zero vb.rgx 8 0 yse7:q nz,l;hz9placceleration in the +x axis. The velocity versusq 8 y s7zxzrl:0enhb.9;v ,lpg time graph of this object is

  The slope of a position versus time b f qc07 mp(rzm:l2q(qgraph gives

  The slope of a velocityg kep2 r5.j;gd.3 phum versus time graph gives

  The area under a curve in an acc:iw9m +rngk(y eleration versus time graph gives

  The area under a curve ie/g7 iv: f)ttpn a velocity versus time graph gives

  If the position versus time grah7(zmei6f 6 vehxd7 e*h8k s70- lsecmph of an object is a horizontal line, the object i h8 zl-d6hf 7mehss0( ike7 ecm7xe*6vs

  If the position versus time graph of an object is a vertid sxnd2+h3 7dccal line, the object is7+hd dc 2sxn3d

  If the velocity versus time graph of an object is a horizontal line, the object4xt ,:k -ikpvc isx4i:-k v kc,pt

  If the velocity versus time graph of an object is a straight line5jjxp5pv*- 6 7qxos hz making an angle of 30 degrees with the time axis, tx oqzj6*h 5sv j5-px7phe object is

  An object moves 15.0 m north and then 11.0 m south. Find both the awz4pap* f5xplpn- +,distance traveled and la +axfwp5p4 p* ,npz-the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. wd8b df(ig c1. How long will it take to move 12 km upstream.gcw( b dfd18i in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 mu7p ddgc7 t52xp53skq6 fv+r c)

  What must be your average speed) tzwl,+.1tux p*tbja in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approxim ,ydam-diq 2*) my+k3-vutz ghately 42.0 km) in 2 hours and 57 min. What is the average speed of 23ua-dgdtvm*kzq-+ iymy ),hthe runner in m/s?

  A car travels 90 km/h. Howbjts9xm*du4 12nw s-t long does it take for it to travel 400 km?

  A ly (light year) is the distance that lik x. s.dpi: nx/*hch7pght travels in one year. The speed of light i: hdi7/.snkxpxcp* .hs $3.00 \times 10^8 \; m/s$. 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 roat:sj ga*ym8 5pd and you look to the side for 4.0 s, how far do you travel during this inattentive period?:ymg*s 8a5ptj

  If you run a complete mia ewgaq at9w3chel* u:n5-u/i *3z 2(vb5 pgloop around an outdoor track (400 m), in 100 s, your average9:be*mng5a3/-wu2 pg(z q*c va 5la3 tiuw ehi velocity is

  A polar bear starts at the North pr97ns7somfzp1k60fs z pg 1: Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1p7fsk s7zzfo0p 1sm:96rn 1pg.0 km west to return to its starting point. 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, t( ah -6hsxfq27rt d 09uji(w*ny)ycwlhen 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's average velhtq(0)( l6yw 29 7hcnyxfsuwid a-jr*ocity?

  You are driving home on a weekend from bv4s/ f0b* xnqschool at 55 mi/h for 110 miles. It then startssn v0 4*bx/fbq to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 (wvw7xy 0l0jxkm at 100 km/h. What is the average speed ow(w07jy vxl0 xf the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and y pm0qf9; ts,t2.0 h at 100 km/h. What is her average speed for p ,9 tytm;0sqfthe trip?

  An airplane travels at 300 mi/h south for 2.00 f3 6nw1oxwpr )nl 0ofov5z7r +h and then at 250 mi/h north for 73 l rwno5rwv6f 0+1p f7o)xnoz50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 10-np,o;nu8b qnr t /r+p0 m) for team A c+nq -nutpr8, nbr;/po an 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 lose the race?

  A car decelerates uniformly and comes to a stop acq -oq7by9nsoe z /3rwb;yt 2rrsv2-7fter 9 s. The car's average velocity during deceleration was 45 km/h. What was the ca39bv c;eq s22q b7 7rrwt yonyr-/s-ozr's deceleration while slowing down?

  An airplane increases its speed+tol*9keynwj;m1n/ ,drmw* l from 100 m/s to 160 m/s, at the average rate of ywnd;*nl+mome /9*,rj lt 1wk $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thac:y vpz/. y7md:i8 vne 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 rehq0ygc*edp)vcw3: lj u g8)p -st 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/s for 10 s. It then s;v xbq1sx 8ul4krs9iky sf a975dh4(qpeeds up with a constant acceleration of sykk v 54qal8;qh1fbsrd9974usx (xi$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.2 m/s 4zbo3 )sfbgj4/zih5pexperiences a constant acceleration of zh3 pj o5gb)fsiz b/44$2.2 \; m/s^2$. What is the cart's displacement during the first 9.6 s of its motion?

  A bullet moving horizontally tot2f /e f.gn5dy the right (+x direction) with a speed of 403 m/s strikes a sandbag and penetrates a d/fyng5e df2.tistance of 30.15 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 reac+;*jvz79xqge h s 7etnf0hlw: hes a speed of 42 m/s at the end of the catapult, and th+e :w0h s*vh;qj9g tlef x7z7nis requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accdh,ybh u558 h6g;pz kmeleration 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 distanc+zsls9tjmk i fyk8 a*52 (j4z9hsy+bxe of 200 m. What is its average acceleratioj5 zmsy++j skbiylf8az4 k29tx(h 9s*n?

  An object starts from rest and undergoes uniform acceleratl+l 70jql 91* ejbfu/s.d vllpion. During the firstpq/.j ed79uj1l v0flll l*b+ s second it travels 5.8 m. How far will it travel during the third second?

  An object is moving in a stra/t 2:eg4vk3*wcjgc v tsevgo1xis7 m05+-goaight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fasvc eeixgmk/ 04vc*235a7o1: g-g o+ttvs gjwr does it move during this time?

  A car starts from rest and accelerates uniformly-j(hw -bj/ rd40uxm ey 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 b e;uyjutf2r)kn.; 7qw2 u6 moqcn,6ycan 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 has been waitiq 0mwz (tyy8k*ng at the intersection starts ahead with a constant 0*tk8 wqm(zyyacceleration 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 X wheleug3wu95) , *v qaoqera5e,olge vu9qw* )q u3e the acceleration 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 sp;x ck9 ry0gi6ax:k9f deed of 12 m/s on the surface of planet X where the acceleration due to gravity idgxc60i k9r 9kfayx; :s $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 yq t pl.3 t-hygz4nwvy7s9r nln38tg73r54gfm/s on the surface of planet X where th39f37wny3 nrl7yvlgty .zt84t4gnrs hp- 5gqe 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 spear1z3 moum8r:qrmf*)ed of 14 m/s on the surface of planet X where the acceleration due to gravity i: mmr ua8o1rqfmz3)*r s $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend hol9uz8-no7 4t o*du oowzds a ruler between your fingers and releases it without warning, how far can you expect owd-z nz*uo7o4to 9u 8the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 mt+guuttv91 6 b/s. What is its velocity after 3.00 s 6 1t9gt+btuvu?

  A bullet shot straight -ju,tha bd,my3su1,t up returns to its starting point in 5 s. What is the initial speed of the bull d3mu,sauth ,1 ,j-ytbet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take t4klgfwo7* t8w o returnf87w4gw t lko* to its starting point?

  A ball is thrown downwar9rhfmrwd v j7/62s7siktm 7g6*e qc;bd from the top of a building with an initial speed of 16 m/s. It striker6v6g7s/t2w i9 jcbe rsk7mf7;m*dhq s the ground after 1.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeria7y.w ziyqe4 pi3n*k/ r lh-+dcal value iak7 idyneq y/w.zhi43rl * +-pn 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 the air with a spe4tnc/h-pf oj2i :gq2no n)f)i ed of 31.4 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is t9etj m k(5yxx* g2j*cmhe velocity at t = 1.0 s?

  In Fig. below, what is the velor9) j.jvvpjzfs7d -z2n tj: n9city at t = 2.5 s?

  In Fig. below, what is tg3 iyqz midc ).c g9x7/j4jncz3* ad1z i.afu3he velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5e; l-m3 k+mpaeu -iq:v s?

  In Fig. below, what ie0l.upz9 ,e(ij5i rtbs the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average veloc.j )xtq xijfo *8n4hc8 ag8z6jjfe e00ity from 0 to 6.0 s?

  In Fig. below, what is the acceleratxghr+z2yo:)v 9s wvat4x/:ce6 j3 wo pion at 1.0 s?

  In Fig. below, what is the accelerhpwww gj5qh3h/ 2cd5 aq;3 o ;fs/z8kuation at 3.0 s?

  In Fig. below, what 2bho wa5h2k eo3x5xhg: ht3-lis the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the63 ,(( hpmh cy-p.vrv 7pjnras average acceleration from 0 to 8.0 s?

  In Fig. below, what is the dis. 7j.) loex yzss.jbr-placement from 0 to 8.0 s?

Does a car speedometer ic+3 0j mg2k x3bx7tgfcmgo- .measure speed, velocity? {speed|velocity}

  An object can have a varying speed if i+;8y:o/gvf -p/ zpymk,i bgnr ts velocity is constant.

  The velocity of an object can be 8n r:xs*4g- ug3 4l d3 wxwph(uxs.rlo5yi .sbnegative when its acceleration is positive.

  If one object has a greater s ) kk q:h.cr /;mfs dqch62fqblu:,c7gf5t z4apeed than a second object, the first must have a grdt6 zqaq c/mh:k7f42u5);klbhf,rf.cs gcq :eater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a sgun ka owpk.3x4 /i.f;7wmj0, ficba2peed 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(ai+etm j2j 9-ddb v 6uvc6(+vih0clk as its acceleration decreases.

  A baseball player hits a foul ball straigh 6trmcas5;vy tbl 0p:xuxg:33t up into the air. It leaves the bat with amt63:5rp;3xlxavgyu:c 0 bts 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, wd ugwnf )(/pi6bns,2 ahat is happening to its acceleration, how d(/anwsb u2 n)6,dfgi poes it change if air friction is ignored?

  As a freely falling object speeds up, whazaop h9nq /j.hyk1a3;/pwbhd w q+4e9t is happening to its acceleration, how does it change if /.hkao d1whhzpwn9ae/bpq + j y94 q;3air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original 0y0(f4+j zgidebyi/co , ny( nposition with the same speed as it had initially if air resistance is negligible. If a (c0yn+ f,oeiy04j gid(/nzybir resistance is appreciable, how will this result be altered?

  An object can have zero hqbz(20uo*2y u nza onogt796velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero accelerxcqk01 +m(.w 4 x slyctknxoc(pq**z6ation at the same time.

  An elevator moving from the second floor to the fifth floor making no stops al7j6 oo/vf dqtsr7px, ;ong the way,ojp sx o/6vqtrdf7 7; has zero acceleration all the time.

  A rolling ball moves fro 7s) 2oabuj7(tj3ivrym $x_1=2.8 \mathrm{~cm}$ to $x_2=-7.0 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ 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 $t_1=-4.6 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight ()9ebp9gmlyxav y 80zayr +8 ucomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.8 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 byo q 7o9ex4+3sli9it line, moving 99 m away in 8.7 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculateit 93q9eloxio7y+s4b (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 from 2(ef2q4e t;atgg1lup:qaj) x(vh vz 1$13 \; m/s$ to $24 \; m/s$ in 6.0 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 fromm.buamgs a2t w *+(i78jfrzt: $17 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speevivp. sex:s+vemd c73 n.wqir1m* au+c*y. :md of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out ofcn dzzj5k r4/ (q4sf:i the blocks to essentially top speed about/id:5 c 44fz(qjrkzn s $11.2 \; m/s$ in the first 11.2 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 of 3x,0 ngs c6lbtzxe8+ksqi6p( $18 \; m/s$ to rest in 5.17 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavesm8ahiygc4+ s+ skid marks 92 m long on the highway. Assuming a deceleration g ma4+h i8+csyof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck )y1wuju) p9(w5ft f8vn-a:+xfz igz ogoing $25 \; m/s$ 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 d *y3lswd5 1lkt6qx/s than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerat/ s*ls 5l31tkyd dw6qxe at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$