Suppose that an object travels from one point in space to another. Make a compab:vmu(3jwx- al4tz v pv0o- z a(r2q.mrison between vmzo3 xv qwv jz-bar .-(ap(2t:u4m l0the displacement and the distance traveled.

  When is the average velocity ofz(,yz (w ki/r ddhxugh 4u)kpt89 mv/, an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in6n4ru,z g0 ukdsow bsz*1f-/e 8 s". This is a descript z/u 0o64wb1 -gnfd*skuresz,ion of

  An object moving in the +x axise1(zk1np 5oxqc exg e (n9y;n5 experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+rzj +bq))n3nha9q*xx+j q zy 3x direction) begins to slow down as it approaches a traffic light. 9 q+hb+3y3)nxanjj zz*qx)rq Make a statement concerning its acceleration.

  Suppose that a car traveling to the dqo;7 8cx5rw4djtwshpg8:e ked2: p ;u1;pwoWest (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerningk ;w1jercd25ppxh ; we8do4:7s8upogdtwq ;: its acceleration.

  Suppose that an object is moving with a sh 5jewt tqm.)l2yh,9constant velocity. Make a statement concerning its accelerate92jtl )myhs whq.5t,ion.

  If the velocity of an object is zero, does it mean thcdm/ g8y k fe6ldt,c(, vairny e-5c63at the acceleration is zero? Support your ansg cyl8 ,rky mc 6e6(/n3t5-aciddfe, vwer with an example.

  Can an object's velocity change dir 72fj:bpttdtb0b kv;ay.m rm462 nct/ection when its acceleration is constant? Support6t2jn4:c;r7mtfvm0k tba 2d/ bbt y .p your answer with an example.

  Suppose that an object is movin,b6x y rgc;9ufg with constant acceleration. Make a statement concerning its;cygfxbr u69, motion with respect to time.

  Can an object have increasing speed jg3oj(ok54 orwhile its acceleration is decreasing? Support your answer with an eor4( o5kj go3jxample.

  Suppose a can, after an initial j :dmoh /a4ep-+ imw7t(gm*cf kick, moves up along a smooth hill of ice. Make a statement concerning its accelerati4 f/adi(tm p+c7he -:w mmo*gjon.

  Under what condition is average velocity equal to the average of t0 )kz xgy0;gzbhe object's initial and final velocit kyz0gg0b;x)zy?

  Objects A and B both start at rest. They both acqza5/ wldn 1ahyzf;;kw) kl44 celerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed kzqd)44klyaww /fa;n 5h1l z; of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate.;tpsf3 dd uy;8 ayv8: rifht92 However, object A accelerates for twice the time as objeuadt82:f p 9;8d;rvf3s hyyti ct B. What is the distance traveled by object A compared to that of object B?

  When an object is released from res ,giy17nm 1aszt and falls in the absence of friction, which of the following is true concerni n1g,7 y1aiszmng its motion?

  When an object is released from rest a9 fc )no6fnbi8nd falls in the absence of friction, which of t)obfin f8n9c6 he following is true concerning its motion?

  Suppose a ball is thrown strae; jmzaf0j ,jrs)(n+vight up. Make a statement about the velocity and the acceleration when the ball reaches tv;+ rjsz,mj an)fe j(0he highest point.

  Suppose a ball is thrown stra f pm ;,go*mo,zwnuxv q+.ek+5ight up. What is its acceleration just before it r *z,+v,qxpwonofe+u.m ;m 5gk eaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum myrg5 k+:(p (v; 9npjb oxehbye7g;r8height, then falls to its initial height. Make a statement about the direction of the velochrbr:;b x y(ke7 nep 9vym5g(; 8op+jgity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a ma6ph4dh1ff3vnnx 2x(uf8o lo me6k1*yximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is co ufynl*x1h pdk m6vhf12o6 e (n43xf8oming down.

  Suppose a ball is thrown downward in the absence of air resistance. Mo 2e6yj16 zfejake a statement concernije6y16o ezf j2ng its acceleration.

  Suppose a skydiver jumps from a high-fl wt0g3)5ed1z4do2zlnlx rd e8ying plane. What is her acceleration when she shx 0retd2)34w8 d z1oe5zllgdne reaches terminal velocity?

  A ball is thrown vertically upjl)l0te 2lh 8hward with a speed v. An identical second ball is thrown upward with a speed 22e)l lh0th8l jv (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. lw/w/7rkt pt/ One second later, ball B is dropped from the same building. As time progresses7/ww t tp/krl/, the distance between them

  Ball A is dropped from the top x2ta a*rnf6vrx30 ;ytad.svhpe +1*zof a building. One second later, ball B is dropped from the same building. As time progresatx*2at;1svrfh*e da .v zn +xr3p0y6ses, the difference in their speeds

  Two objects are thrown from the top of a tall building.g6c1b ;t+rr bkdu20e u One is thrown up, and the other is thrown down, both +bud 62rc e;tbk10ur gwith 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 thrown straky-u s*4 gxwo;erl/a5 kt9h;light down from the same building. They are released at the same time. N x o9y ;e/uw;hglk4r tl-*5akseglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in thetu:zz:gcp+fv9a x4oqy: tg5- +x axis. The position versus time graph of this object - fz9:tx:z5q a4vco:+tgygpuis

  An object is moving with constant non-zero acceleration in the +x axis, mkfv/ o)y-ou. The position versus time graph of this objvfy/u kmoo)-,ect is

  An object is moving with constant non-zero velocity in the +ekm7hk9t5j4-b1) qd+oa4do t.pf p jd x axis. The velocity versus time graph of this object jd4+k7 b9pd htqm1t k-aoj4opf5e .)dis

  An object is moving with constant non-zer qbjy(3 iou 8eq+i(,wyo acceleration in the +x axis. The velocity ve q(ie(+y8wbi,ujq y o3rsus time graph of this object is

  The slope of a position versus timegwj:x; f 1uqa9 graph gives

  The slope of a velocity versus time graq6(a ucy y48jos 4z.gp1re)uvph gives

  The area under a curve in an acceleration ver*c fex)x6 yz* oal+1lhsus time graph gives

  The area under a curve in a veloc2mra tyzr/2j 5ity versus time graph gives

  If the position versus time graph of an object is a horizontal line, th2vc2ad -zr jw1e object a22 w1j rd-zcvis

  If the position versus time graph of an object is a*bcij4d0hv 8hs *ddqqh.y5 .3)ee u rk vertical line, the object is be8hqqye hd*4j0kuchd vr.d3)i5s *.

  If the velocity versus time graph of an object is a horizon8 6/lmv.cxo )gfc( 5xd/gowxvtal line, the object cx5ool/ 86m (wfdv. )x/cvgxgis

  If the velocity versus time graph of an object is a straighf3f.s y*t *yjht line making an angle of 30 degrees with the tim.*fyy*jf ht3s e axis, the object is

  An object moves 15.0 c 6p0+ p,-zgccy bsj6xm north and then 11.0 m south. Find both the distance traveled and the magnit -6cpcg6 ybcp0js,x z+ude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will 0 in2f t.*ixk x7aax*r-+sq gait take to move 12 km upstream in a rirt*aa0+* xfks27ix a.xng -qiver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 160d*j :xbut)vq9i; 4 z(w:plfjm9 m)

  What must be your average speed in order to travel 350 km in 4uwx.vc 8v ef y676zosvk;e6 q5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2muoxehit gwt xm) -4)xd-27g- hours and 57 min. What istgie x-gux x))2o4 -htw-mmd7 the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it tuvrg: :v,kl6yake for it to travel 400 km?

  A ly (light year) is the distance that light travels in o nee.ceor0:cby *)9t(o4 xuc zu+ek;vx l+)hune year. The speed of ligh) o v*c4(+;tyuuen9ox)ku +r: 0e.hccle bzxet 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 andk70op+ yck7e) jdi71vt 7rtbwfkqo7 0 you look to the side for 4.0 s, how far do you travel dukb77qif +)7r7 wvcdetokyo0k1t 0j 7pring this inattentive period?

  If you run a complete loop aroui(fsp50 kza+ b65u)u2kxlbex nd an outdoor track (400 m), in 100 s, your average velocity is)sfa5u6z bi up(kx l5bx 02e+k

  A polar bear starts at the North Pole. It travels 1.0 k89x qg/6ctyj3qx ,n frm south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its 3g ftq9cn8j6rx/,qy xstarting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at t;wv;phk7px vm 3s pg)s--4ye qhe North Pole. It travels 1.0 km south, then 1.0 km east, the m 4qsppywev;- h;-p7 g3vxsk)n 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 velocity?

  You are driving home on a weekend f8w yj6tzp4.2sn+ 0 vyq 2lsbdzrom school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from s8v6q2 bts s0.4 2pzwy+jdnzly chool?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. (smw* yg1v 2y2cau8kf What is the average speed of the motorist for twm y2fsguacvy 1k2(8*his trip?

  A motorist travels forvh x2)4f3j6 wtfdkpa: 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for thew)f: h2jafd4vkpt 6x3 trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/ht , geapgoa q0:*k,vfeq jf++wbsr3.: north for 750 miles. What is the ave*vob.qts,a 3,g+ jek0f ae+q:: fwrp grage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) f mu h.ew)d .3)-obcvw1 taowo42bc *zkor team A can run 100 m in 9.8 s. His rival, the anchorkd3tbmc vw.w4)o.cbzw )uh*o eo2-a1man 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 after 12 s+v t- bzw:1 gz0dmv1+jmjwo- c. The car's average velocity duringj+m1tb jwzzg d-: 1-+0wvcvmo deceleration was 41 km/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 ky5nbo6b;hv- of 6b;v o-ky hnb5$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the r ta;tj orx5aqn9;h +,3s j/blz 5ry6izate 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 anr6k c4jkil 08rluj 2l:d accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then 1l+vn0xsxho5fpz4 y2o/erf-8kg 2yd speeds up with a constant acceleration o o42+/nxd8exrfvf s2ho 10gky ly-p 5zf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.0 m/s expb*+)exb2rxgum g:2a p eriences a constant acceleration of2pab e:xmug2gxb)+ r * $3.4 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) witunn8:tdl,9zg; ynw k-h:me c 7h a speed of 535 m/s strikes a sandbag and peekug7hyt;nm9nzw :l,- c dn8: netrates a distance of 31.23 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fr; vbfu zh0sd3 7fljjudb5/7(h q3 hz(com a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is thqsjzjb75h(3uuvh(b 073lfd/cd fz;he length of the catapult?

  A car starting from rest moves with ru;q jtwexi 2e5w0to p.):,yxconstant 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 isyv,/ 6htw9 ssdu-jgi. its average accelerati/hd6wj 9tsg.iy s,-vuon?

  An object starts from rest and undergoes uniform(vms j6xrixqy2 b3um-a 6s+1n(k lw+b acceleration. During the first second it travels 8.2 m. How far will it r(qb+w2ssxvm+ lyx6-ak mi 1j(u6b3n travel during the third second?

  An object is moving in a straight line with constant acceleration.ljyi lm/(jsl)nto8/7:pk c9p Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far doeskt/9 7 o m/ppnjl8(j isl)lcy: it move during this time?

  A car starts from rest and accelerates uniforml2jam5+ ovd9u5 o.jlr cy 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 decvx/:y 8o lrjv cdzuecg;4j:./ elerate 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 tur(+whvut4 m:m ens green, a car that has been waiting at the intersection starts ahead t( ehv:mm4uw+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 ;,illmjt2v6y . n*qkzi* qhg5on the surface of planet X where the acceleration due tj;,lzm6niiy .v t lg5*qh qk2*o 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 the8 ta hk ;xpp b;f,.vn4re:b opsn3m6m, surface of planet X where the acceleration due .mbxbpst ;;k68vp3 am ,fh,nno4pr:e 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 ov.4jbwwfz,4vl/8 27wk p vpysf 15 m/s on the surface of planet X where the acceleration due vp4.fb/y2v4 kzw vwl,wjp 78sto 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 ofw0(geav, ;gws6kva 9c planet X where the acceleration due togk(v9sc ;g, vwe6w0 aa gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend holds a rulen ,e/gto9go 2gr between your fingers and releases it without warning, how fao n,2ot9g/g ger can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 ym*ciozx; ;ph/+gp5bhk-(f sm/s. What is its velocity after 3.00 (php+o igsm/ky;x 5-fhcb z*;s?

  A bullet shot straight up returns to its starting point in 19 s. What is the dz+yzh/26.id iqwov - iniy2 6 zvqdd/ozwii.-+htial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take s1 fly9lq76bm2vzrd3 to q3 rlds7b1y9f 6vl2 mzreturn to its starting point?

  A ball is thrown downward from the top of a building /+ t0:i4w r iyhzre;sqwith an initial speed of 19 m/s. /iw;et +rr4hi y:z0qs It strikes the ground after 5.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in num.g cb47l a 1hyo8cnep(ama+snk;6 yl8erical value in the blank6 ohlpnyaa bl8 cn a(.kgmsc7e;148+ys)
(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 sp;l6qpk6trpqg 7bym-3 eed of 40.7 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 zb)jq vp6.t uxhisg-ey:0c4dfm 957s s?

  In Fig. below, what is the velocity at t =jr4bxkmy)b3l dg ;/x3 2.5 s?

  In Fig. below, what is the -rs-sr fvs7c3 velocity at t = 4.0 s?

  In Fig. below, what is the velocity 2 v:ti .i**zdq k/m2 qykxp4ifpd4tg2at t = 5.5 s?

  In Fig. below, what is the av rfgc zbr0;4.ba: o;e5ocby2ff p, f87u byts/erage velocity from 0 to 4.0 s?

  In Fig. below, what is the un0/kmut;r+u g4iy6s3qebo p;ed44u average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a 3wr-fithd jiw2/3*hc *s p,fet 1.0 s?

  In Fig. below, what is the acceleration at 3.0ka/9gycmako nlu9 s4*/fr2 ,v s?

  In Fig. below, what is the average acceleration from j -8v 8dkid:bp0 to 5.0 s?

  In Fig. below, what is th:va 5kj3z dg/te average acceleration from 0 to 8.0 s?

  In Fig. below, what is the di1jiw a)x-)kvewy:i9 usplacement from 0 to 8.0 s?

Does a car speedometer5+q wa(.mphag measure speed, velocity? {speed|velocity}

  An object can have a vntetxr . s*0ma l+4 4nc-okla)arying speed if its velocity is constant.

  The velocity of an object can be negative when its a+;idcm(.oq1e( wpqjycceleration is positive.

  If one object has a greater speed than en bnw+ c., /q6qhl9via second object, the first must have a greater chn6blv9 . ,eq+niwq/ acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveli bdfs1 8y-yiy4ng 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 speedlksf g+5jyxkmef 2xm-)-,x ;q as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leye2 :dscd, qr7aves the bat with a speed cr y2:esq7dd, 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 itlno1n 666hvus happening to its acceleration, how does it change1l66th6vnn u o if air friction is ignored?

  As a freely falling object speeds up, what is happening to its az;ux. q r6jo4wcceleration, how does it change if air friction CAN N;qur 4xow.6j zOT be ignored?

  An object that is thrown vertically upward will return to its eew57*lts uo; original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how willelt ;eu*s5w o7 this result be altered?

  An object can have zero velocity and nonzero acceleration at thel7g kkb+sy5f,j jvcl62rt3r 7 same time.

  An object can have nonzero velocity and zero acceleration at they-nfz9i7)m vl same time.

  An elevator moving from the second floorpdcq1 01dkvp4m )5j8saq l 7xu to the fifth floor making no stops along the way has zero acceleration allqv7 k)l1msu5j 0ppcx14 aqdd8 the time.

  A rolling ball moves from 6e6r7 ffp 3o0o31ybmgt8 9 dwcbmn.de$x_1=3.1 \mathrm{~cm}$ to $x_2=-7.3 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.5 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ 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-mil, qi g98v/os*sk ftjr6e ($1 \; mile = 1609 \; m$) 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 fiondlqblml 5r f. la)or.t19 i +8y/3urom its trainer in a straight line, moving 94 m away in 8.3 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its averagl.rqa 8ollyrim+f5o b3ld)9/ i.tun1e 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 b87ih1ipuovb 5t ev2u6dff41$11 \; m/s$ to $24 \; m/s$ in 5.5 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 e96-rju d -3u9zo71f2tleam clsy fkyn,. k c7$17 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s8or6wi 3t 3lls 6-hrm ..dsimphc-s( xk-l (dfpeed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprintc:e:osj* brfrz772yzew2k 5y;4 d j vcer can burst out of the blocks to essentially top speed abou b we:f5 : r7c*c2y2dzvse j;zr7ykj4ot $11.2 \; m/s$ in the first 11.8 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 fr1,g8mvg2.t32 rwtpet e, ohpvom a speed of $16 \; m/s$ to rest in 5.63 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. Assuming (w: uqgbd2odl-efj q(jo, i4()nrr,c a decioj)wfdq,:(2q eg(lr 4 ( -bjo n,rduceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru8ct0( pa95j bu5fc fjcck going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 mnj7baf8dx8-n in. After exactly 27.0 min, there are still 1100 m to go. The runner must thebfnn8-jxd a8 7n accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$