Suppose that an object travels frq(fc8w fcsw axm;u.2 .om one point in space to another. Make a comparison between thw2f8 .ws a.xcfq(c;ume displacement and the distance traveled.

  When is the average )gsy7)a cjli4l k;me h0o2+pqvelocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that fg 6l0qym7xe (their car can go "from zero to sixty in 8 s". This fy qle(0mx6g 7is a description of

  An object moving in the +x axis experiences an acceler*tao6g(rfr3v la6 .zl b/ou4qation of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling clx d044s d:(pe+nqz ;oa vk8it10hywto the East (+x direction) begins to slow down as it approaches a traffic light. Ma cxylzp sw0:v h+8t(ie; qao4k dnd140ke a statement concerning its acceleration.

  Suppose that a car traveling to the West (du/az( +anjb 1rh)rg y/ap23p-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning iguha2 b(3/ rand/r zpa+1pj) yts acceleration.

  Suppose that an object is moving with a constan(uk e e 3ch*q8/:gkport velocity. Make a statement concer (/pgrkk ech:qe 3o8*uning its acceleration.

  If the velocity of an object is zero, does it mean that t-pb3udpri3cm/5u 8k lhe acceleration is zero? Support your anlcb3i5pm udu kr83p-/ swer with an example.

  Can an object's velocity change direction when its acceleratioq e l6q08 xs(c.dapx;qy vqq:h1c)j*en is constant? Support your answer h;x* 1.l0cqpjdye 8:vq(qxqac) sqe6 with an example.

  Suppose that an object is moving with constant accelerati j; ,jiptw((wxon. Make a statement concpx ;t(jj,iw (werning its motion with respect to time.

  Can an object have increasing speed2hk*ea2.1l a l(mqmfo while its acceleration is decreasing? Suppom lkof21lh *me a(a2.qrt your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Maky/kxe b*7o r+ekn 0kj(e a statement concernin*rkxebyj (+ 7k/n0ekog its acceleration.

  Under what condition is average velocity equal to the average of the object's in*es 8qd7 1de8lsmj(lbitial and final velj7s1d q dbmel (le*88socity?

  Objects A and B both star2deha jbpv 7 4bxfsmc5k,)+s2t at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of objects )apsev2 7+xm,f5h jck d42bb A compared to that of object B?

  Objects A and B both start from rest. They both ac;2:z-rkkl/tgm q 8et*cj daj5 celerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance trave;k8aej*j:2-tkm c/r5gzq dt lled by object A compared to that of object B?

  When an object is released from rest and falls in the abse 5 9rwu,fic(vgnce of friction, which of the following is true concerning cf5vu r wi9,(gits motion?

  When an object is relea6c2 m.q x ng0 ,ghhk -(gjdpzp,:xg.cwkhb;(xsed from rest and falls in the absence of friction, which of the following is true concerning it( kq.hpj,b zxc6,: mx0 x-gdpnk2hghg(.w ;cgs motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity andzqhd5s9u i 58x the acceleration when the ball reaches the highest poinq5hsz8 du i5x9t.

  Suppose a ball is thrown straight up. W y9smm*h154zngsfug-/;* g c fc7nlxw hat is its acceleration just before it reaches its higxymfsn 1-gg/sw *;nf9c5l g4mch7zu *hest point?

  Suppose a ball is throwtj2q8 6 nl,x4lj ob h/omr(b+an straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction ofj/ 6nbmlrta8x, ol +4b(2 hqjo the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a ma0)w .kwv5gfr1 o gl9;f til2 kpnesa(+ximum height, then falls to its initial height. Makwle; .alf ow1 i k9)gk5s2 f+trp0vng(e 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 resistance. Make anef;t rt3dg7 tku)2k mp5 2fi: statement concerning its accelerationk7f t23g5nki)udprf 2te;tm:.

  Suppose a skydiver jumps from a high-flying plane. What is he az)y 8f.bblmi09 se/zr acceleration when .bmlsy/0) ebiz afz98she she reaches terminal velocity?

  A ball is thrown vertically ; 4*s*qvw upqby :qtqdy ( hhw3,-6uwaupward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first *dyw , (a*tvpw-uqq6q3hwu;4qhs: ybball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. iy.jgn:fpro 3pmr-8 ba-(cpoz4/nq7 One second later, ball B is dropped from the same building. As time progresses, the distance be:/fmp. qj3by(zaigpr847 - oocnpn-r tween them

  Ball A is dropped frou kc0gty9 -w*7ca n5ygm the top of a building. One second later, ball B is dropped from the same building. As t9y0gu-75nwkyc t*ag c ime progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is:qx 6x5iht9f s thrown up, and the other is thrown down, both with the same initial speed. What are their speeds whes9:h fxqxit6 5n they hit the street?

  A brick is dropped from the top of a building. A second brick 5.q b f/rekmoyy;:j/ 3x7- +xrvfqjat*vyc4 mis thrown straight down from the same building. They are released at the 5aemb.mj;f:/r ft-rv*yyc4v7 jx yq/o3 qx+ksame time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positqp qdz,hx7 dp2d .q sbc(t 7j*fjc0naa*lo/4)ion versus time graph zaqqos.cd*(t dj0 ,lcdx/f *)qpab n27h47pjof this object is

  An object is moving with constant non-zero acceleration in the +x ax oitarq-cv/1p;8 s, q tcug9r xxl.32vis. The position versus time grapht1 3rt8xqqovl ugxs2/9,via .p r;cc- of this object is

  An object is moving with constant non-zero velocity in t*os8 cucjc93uhe +x axis. The velocity versus time graph of this object cc98so3u*c ju is

  An object is moving with constant non-zero acceleration in the +x aoy/cw7p epz+v 2fq/7 t4*dyfsxis. The velocity versus time graph of this obqf7ey*p+vf47/ oz d p/ w2sytcject is

  The slope of a position versus time grigyb9 c(gy* x:aph gives

  The slope of a velocit,fff7x o0yg7cfk9 vz:uwd08mt9mg7kqu yp:+y versus time graph gives

  The area under a curve in an acceleration versus time graph f2anko n6,tj6f/i s; 2+m zubegives

  The area under a curve in jsb// 9wb p(q kf5cjo.a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal linerwjvguvo9 m)viq 9)vb- 2 (m/r, the object ir gq(vv)u rbv9/ )woi-j2vm9m s

  If the position versus time gray..y5hl ih c)qph of an object is a vertical line, the object isq.il c )yy5hh.

  If the velocity versus time graph of an9g 8v-( algff 0j7rnc7xii)ht object is a horizontal line, the object is rf n0g -vli(9tci87)fj agxh7

  If the velocity versus time graph of an object is a straight line making ans-3fxq d:sd qqe8w /ol cz9(b5 angle of 3weqqs35(q s8 / d9czo-:bfldx0 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the 4*sh)bmu 7u k noz;uxvrk21;d9u-h u hdistance traveled and the mab 7u d;o)uh uhhu9u4- 2rs1*k;zmn vxkgnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it takeahf91k:qrrj7: 3 rpds/-vtn q to move 12 km upstret 1 -ardq7vf/rsnh9pq3:k: jram in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 bq: v--83.wgbtqw(l n3kpnp umi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 l,lk lokxh 4,;h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours andgb;ds hwa*9;0isqc lna1 a6as 0hj3b/ 57 min. What i *blcaj 61w s;0q3nda0 baahs 9ish/;gs the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travelgb ka+q5to0v4 400 km?

  A ly (light year) is theu-lrt: /zb 7ckxg7er, distance that light travels in one year. The speed of ligelrg7tbu/7,z xc :r-k ht 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 and you look to the side i 4yz/l zjs*77 zeee0cqctd/, for 4.0 s, how far do you travel during thie0ez/t7 7/d iy,q* j4zscelzcs inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avera(:wg fqnn5 it2ge ve 5wt(fi:qg2nn locity is

  A polar bear starts at the No9 p2qzuky .+c;ntr-ejrth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip petc 9k. qu-2 rnjy+;ztakes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km easopot4md6e *.j 7hc2 xj6cdts*t, then 1.0 km north, then 1.0 km westj.xddm7 6*pj h eo*os ct2t46c to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weesba8i xzygpt/- xy2/7kend from 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 hb/px8 aiy-g2z/s y7t xours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h an ohz 0,/u 8j )rjtbu2qs0ixbll7k1o7ad 160 km at 100 km/h. What is the average s l/b h x 2t8ljojsb7k0iu1 uqr0,)7zoapeed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h andid ae7d7b qy(qie p6p..lf 1iy99cia- 2.0 h at 100 km/h. What is her average speed for tf1d6ii bpqeaiacyeqp- d9y 97 l.i(.7he trip?

  An airplane travels at 300 mi/h south os xa5 5a3z,tztmc2b5for 2.00 h and then at 250 mi/h north for 750 mil 5xa 235tbzz, 5atsmoces. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for 0 obmylwd6ap*( ck*o :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. 6omalc0 w:oby* *pk(d 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 aft ekqn*v,.ojkx 3o r3;9)a:+rubptnwzer 9 s. The car's average velocity during deceleration was 42 km/h. What was rke):,wnvx3q *kuor9zo+ n.p3b t ja; the car's deceleration while slowing down?

  An airplane increases 4a; 3xpagh+jr0z/ao 1qc: owt its speed from 100 m/s to 160 m/s, at the average rate of 3t;arq o 1a4cwapzxjog:h0 +/$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the 9 yc*( vswn2czrate 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 reuxmwa dkexb /mi11t: .;db/b;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 1txb 4 kssvq ek8e).d4si613rp0 s. It then speeds up with a constant acceleration of 14s8eteq rk )p sk.b36dx vi4s$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.2 mhpt.e)3 c:m m- 8 3kyek1wtxkp/s experiences a constant acceleration ofkw)p3mm. 8:ex k1p k hty3-cte $3.8 \; m/s^2$. What is the cart's displacement during the first 5.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 422 4p*cd0rd nmnkta2s a16j 0ll5 m/s strikes a sandbag and penetrates a distance of 86.07 cm. What is the average a*jdrlk p5am2 641an0slc0dnt cceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It /k i3r(6bnbaj yx7o2 ureaches a speed of 42 m/s at the end of the catapult, and t67 jyuikb(naro3 bx2/his requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest 8mxci1- y e9yg3,g sux 70fchrmoves with constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

  A car goes from 40 m/s to 80 m/s in a dist+ l1fly4d m:pxance of 200 m. What is its average acce41dx pl+fy:lmleration?

  An object starts from rest and undergoes uniform acceleration 7 ekab7qvfc9pc8 / 8sv))jnkwkm-k*q. During the first second it travels 4.6 m. How far will it travel during the third se wj7nq-qk mk8b* )ek9/f)ksa pvcvc7 8cond?

  An object is moving in a straight line with cons( u(iil92qw ,.bc qsvytant acceleration. Initially it is traveling at 16 m/s. Three seconds lat sqy c.bwl2i9,(uq(v ier it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and a vbb+)/mbdb9kpf i )ujr y6):accelerates uniformly 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 ca 9daqb1 b)gjk s (.gvuew*h-.rn 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 tc .g9d(hn8ih nurns green, a car that has been waiting at the intersection starts ahead with a constant acceleratio9chhng id8 (n.n 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 0 nhi+qty*27k mmxe.k of 12 m/s on the surface of planet X where the acceleration due to gkx i+m *n 7qkeht.02ymravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with k;f-nii qobt.vp. t5rr9zo kn 8p34 4oa speed of 12 m/s on the surface of planet X where4 ; qi.kb r.n nok3vtrio98pf5potz-4 the 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 upward4 yi,f:8uu ett0ba/ ph with a speed of 15 m/s on the surface of planet X where the t4u ph it,f8bu:a/ey0acceleration 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/suz8+fl aww,yl5s5m i* on the surface of planet X wheremy5,i afwzwu*8 s5ll+ the acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your frie lvq1yg:l 8r*r0)ajksnd holds a ruler be)1r lgsqlrvyk *j8a:0tween your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a;+l-ezic8bh tt8cb8hj5fja 2 velocity of 19.6 m/s. What is its velocity after 3.00 s8l85-hhtf b8z tj ej2 abcc;+i?

  A bullet shot straight up returns to its star)btp3 pe2x (dyting point in 17 s. What is the initial speed of the bulletp)tx(ye 3d 2pb?

  A ball is thrown straight up with a speed of 36.0 m/s. 9my ta8y(i*vy7f q+kb How long does it take to return to its startinfv8ty9+*y q( aiy7bk mg point?

  A ball is thrown downward from thq d/7yrf 3tex4);d+ whdlkp3nlz/ vc)e top of a building with an initial speed of 14 m/s. It str;f )n/ tvd +/r phyk)x33dz dq4ll7ecwikes the ground after 4.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/sf (ufni ztleqb41bea6i 4 v;r;mb80/u8dpn j:. (only fill in numerical value in the blaqd4me /1rb8vilbb 64p;;0zfitu:n(8e ufaj nnks)
(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 of 4w84.g nvx9swgklvac+ () m7gg 8.1 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*v oh 6 fkgjq3kz.+g5w the velocity at t = 1.0 s?

  In Fig. below, what is the j8 js/9y,5 ltjek2gp wvelocity at t = 2.5 s?

  In Fig. below, what is thcw, a 8ghi gv*j8x4(bk m-z1 wb9dl8qve velocity at t = 4.0 s?

  In Fig. below, what is the velocity age,p2hozuas q ia+727t t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to :g tfzn-)ld,e dhtz: .tzj(- p4.0 s?

  In Fig. below, what 9lnz 9,vuaq.vis the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a s,e 5,lkobvrxrih389t 1.0 s?

  In Fig. below, what is the accelqckz+gvbyj:2+49p m-di+e we eration at 3.0 s?

  In Fig. below, what 3n(lemxd7l*r is the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average +/(rpj g 2d(rqljs55).b: nazhayyzv acceleration from 0 to 8.0 s?

  In Fig. below, what is the d3 +9up6 wguvikisplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitympz-+zo,2b4rwgpr ,) a -hr xh}

  An object can have a varying speed if its veleh pd i.*y,)7l szf:wyocity is constant.

  The velocity of an oit wh7ok/l/s0+ bbm *wbject can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, gacr-; ;cyj3zug7n k0the first must have a gr;r -7j0y; zuc3gcgkaneater acceleration.

  Two cars emerge side by side from a tunnel. Car A y tq8n*397swdnex lm.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 increasing in speed as its oxvm f4,a,xy* x-7( rc kcw+dtacceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat wxvy,qv37beln+, 6ajwn)jvz/ d a;d:sith a speed of 6j lasvd) v3z7qa v+ :j,den/w,b; ynx$120 \; km/h$. 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 its acceleration, hoh0bv,0 qvgxw v.,yzw :w does it change if air frictzx0:h w,w. b g0qvyv,vion is ignored?

  As a freely falling object speeds up, what is happening to its5gu2 qzk1(t aq acceleration, how does it change if air friction CAN NOTz( qa2u 5tqkg1 be ignored?

  An object that is thrown vertically upward will return to its origin* c4ojgvf4fas q(l707d)org 6jfv ):mynh;y nal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be alterj qnfsno7y4 j(g*;)hfvf)y g7oc40m6adv :rled?

  An object can have zero velocity and nonzero acceleration at the sameg -un/l (+snrz time.

  An object can have nonzer32+j9lsyl 2f4 :bcyf3xjy orylw (r7q o velocity and zero acceleration at the same time.

  An elevator moving from the s 2wdd;)3m +2 mweqoqp2, ti/cjhj*n qwecond floor to the fifth floor making no stops along the way has zero accele,2* o thqwq32c;p2ie +dnw/q)d j jmmwration all the time.

  A rolling ball moves f934 ,7pwzu50ehyq)c jftwv:f6hk x cbrom $x_1=2.9 \mathrm{~cm}$ to $x_2=-7.1 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete -i,bb5ure sgv17*f2er w pk) xqvzx/)laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.7 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 93 m l , royzc74z4zaway in 11.2 s. It then turns abruptly and gallops halfway back r z74z,clyoz4in 4.5 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 fro7*lrfqip t*datkq;se34 ao y +1o*s9sm $10 \; m/s$ to $23 \; m/s$ 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 fromdo1u b p-*ykaxt32;vtks vo-4 $16 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed 96vdpb9q pubi)(h+ ceof $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the1 5:qjd7; mb;zab(wtkrj * 1qm fn,wpc blocks to essentially top speed abou (p, krm7dtw ;b:qf*nb; mcqj w1jz51at $10.7 \; m/s$ in the first 10.8 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 from aasq- a-1eep +t speed of $17 \; m/s$ to rest in 5.71 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 th, /gv0qwyv vd 67+qwyre highway. Assuming a decr+ 6 gyqw0vvvdwyq7/,eleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goijims 46rxwk +(fx(yx w owog6m3 (*qa7ng $25 \; m/s$ 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 inv vc4yude/i) 5 less than 30.0 min. After exactly 27.0 min, there are still 1100 m to ieu /5 )v4vycdgo. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$