Suppose that an object travels from one point in space to i1hpme8 wwap+b 6ldy:(t)0 ;ce r2h hoanother. Make a comparison between the displabpoye apiwh;ltw:d2+c)6 h018 hm ( ercement and the distance traveled.

  When is the average velocity of an o*kycbhi o9emc e/qs; x6t 07q.bject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 8 2c jfsp,kr c+l4az)z6q )obk9 s". This i9+pz jk,b)4 k asr2zo l)cq6cfs a description of

  An object moving in the +x axi5pw2gkz53ua nxe-i :qq*cj w7 s experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x /m(hwk luw)zs9;u;5qc yl95ka (7g+yam l qdhdirection) begins to slow down as it approaches a traffic light. Make a st7/yqlq w5dk zus; aw95yh;uclm(hl(g m9a)+k atement concerning its acceleration.

  Suppose that a car traveling to the West (-x directiohlmr/y+ +qgy2w z ng;:n) begins to slow down as it approaches a traffic light. Make a statement concerning its accemlhn;w+ gzyr/ 2g y:q+leration.

  Suppose that an objeclh61.8 xxv b6mi r0byovfcki4p a,p6.t is moving with a constant velocity. Make a statement concerning 8i06v4r,io xa1vmx p lfb 6 .hpc6.kybits acceleration.

  If the velocity of an object is zero,d6c.siaxkjvj 0r*13l )7 rdwc does it mean that the acceleration is zero? av6j3xl)ij dc.drk17* crws0Support your answer with an example.

  Can an object's velocity change direction when its acceleration is cons;zw4xv: dso m+ct,6 psu6 dpj8,paks0tant? Support your answer with a+ dv 6,0t,x w4p;poj pmdzas8sku: 6scn example.

  Suppose that an object is mo 7 wdlxo/7r*qk rpz--hs 9)yvzving with constant acceleration. Make a statement concerning its motion with respect to time.zw-dkhrz/s7vy-q 7 )*9oxrpl

  Can an object have increasing speed while its acceleration is s1i2.j ns hyez- 9u6ucdecreasing? Support your answer wiz.es y- uj2nu6c9hs1 ith an example.

  Suppose a can, after an initial kick, ud/yb9e cq7:i; atsq t9q7 ;75ydps bwmoves up along a smooth hill of ice. Make a statement concerning its acceleration.5u :97btywtdpdq79e ;c aqs;bs 7 /yiq

  Under what condition is a yld*qsf*jgsp4 (t7p ;verage velocity equal to the average of the object's initial jy lfp4*s*gd 7p;t (sqand final velocity?

  Objects A and B both start at rest. They both accelerag:s/fm, l5t9a 8ioqnktes td nv6/63lte at the same rate. However, object A acceler:8/t dv3lgsts6tlfi5/ eq n,okn 69m aates 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 acceleratepn3e 0d f*ncyi2zt6(;cd; xlfz8- oi u at the same rate. However, object A accelerates for twice the time as object B. What is the distanx nozdyczfc*tdi8f -(ien60l2 3u p;;ce traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of frhez7x b.x2 )djgd2kk3iction, which of the followin xh)xkbj 2k3dg7 .2zdeg is true concerning its motion?

  When an object is released fro3t 0ay 2agcxy-m rest and falls in the absence of friction, which of the following is truax g0y2 caty3-e concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and s hx*, rfjs,raubw/ 38the acceleration when the ball reaches the highest bxasr3,wj8fh urs/*,point.

  Suppose a ball is thrown straight up. What is its acceleration ju w(uxult5,vz;gejr*+59qp+ ueel1ad st before it reaches (z* 1uel9p+ g+e5xqrdvle5 tuu wj;a,its highest point?

  Suppose a ball is thrown straight up, . 8ej0eu-c: /g jqbjj3qxzu6l reaches a maximum height, then falls to its initial height. jbl egej.z: c03u -6xu8jq /qjMake a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a ma zm o.vei1o)vkl4+3ohp*m:r uximum height, then falls to its initial height. Make a statement avovko)m*:+3h1rlmopu 4 e i z.bout the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistab1 s ig:pr+h9ince. Make a statement conc :1b+ riip9ghserning its acceleration.

  Suppose a skydiver jumps fronq2wvg /1uu q)m a high-flying plane. What is her acceleration when she s2 )g /qvu1nwuqhe reaches terminal velocity?

  A ball is thrown vertj5kvgj9 djv1cf-xe (a o5nkc isv-+a56 g;x )rically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is 6;jracnvagk x 9-di5 vfc+ 1s55 jj)(kve g-oxthe 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. One secon2; sfmju y snqbqeh06o0 (p3v9d later, ball B is dropped from the same building. As time progresse9 y0(;ps0us j62b o mvnf3hqqes, the distance between them

  Ball A is dropped from the top of a building. One second laterhd+n::esf;yx8h3t kv, ball B is dropped from the same building. As time progresses, the differencde+v 8xkhft s;:hy n3:e in their speeds

  Two objects are thrown b9jt.mfu )ei .tcaftl+.,yq; from 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 y mbit.u+ t;9a q)f.j.e,ftcl hit the street?

  A brick is dropped from the top of a building. A second brick is thrown p son7q..vf6/q4)kgxbnfci* straight down from the same building. They are released at og/ pb nx)cn 6sqq.4kff*vi.7 the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x k-(grfwxqb *5axis. The position versus time graph of this object isxqkrg w(5f- *b

  An object is moving withdg i5f 7t,5caw-o 1lwh constant non-zero acceleration in the +x axis. The position versus time graph of this object i -l7adh1wft5 io5gc,ws

  An object is moving with constant non-zero velocity in the 6d d; r ho2;r g7aw2lkjk/1wbn+x axis. The velocity versus time graph of this obj2 l6gdha kjnr;17kr2o;wb /d wect is

  An object is moving with constant non-zero acceleration in theuy4cg8.ab lw8 (d+n-cwu p(uj +x axis. The velocity versus time graph of this obj cb(l w.u8+( ny8p-jg wd4cuauect is

  The slope of a positiqpvg 4m;*uz .oi3 +le 5x ru.ys89seuvon versus time graph gives

  The slope of a velocity versus time graph gij/06cbyq5o5i h cp (s4u-z8 xu5tobc sves

  The area under a curve in an accel2 zsbzwl/f;s7 eration versus time graph gives

  The area under a curve in a velocity verl ult6gt8c0k:/pac-a1c hc6z sus time graph gives

  If the position vers:+ .m8qntnz o2g;gvd tje8 fl;us time graph of an object is a horizontal line, the object jln+q;etznvo ;:8f t.g8mg 2dis

  If the position versus time graph of an.axuu 080y -xseev;sj object is a vertical line, the object isu0xv -se;y8a0juse. x

  If the velocity versuskj 831zt8 )x lqt skdd9m+vc7n time graph of an object is a horizontal line, the object i798qc zl) skt d +nm813jvtxdks

  If the velocity versus time graph of0wyn0(231 mmk rhim cc an object is a straight line making an angle of 30 degrees with the time axis, the obje3mc0 m(rny1w ch02ik mct is

  An object moves 15.0 m north and then 11.0 m south. Find both4mibt(;hr lqul ++ / z8ky1cn zvs0(dk the distance traveled a0 u(zvr8k qmc+ lb;ds/k(n1h ytzli+4nd the magnitude of the displacement vector.

  A boat can move at 30 km/h i9 2:;egblzgpq -/hiarn 3majp**bcx mc 4g1e 2n still water. How long will it take to move 12 km upstreacbe;*ggcra:2j mqm2 4n9ab*gpi-3/1 helpz x m in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 160dr xa,xxd49 soay-88g 9 m)

  What must be your average speed in omn ,vq 3.ndkuz8wnu83 rder to travel 350 km in 5.15 h?

  A runner ran the marathon (approxick z*ut7q 1mzh5y9f)c9z /bdrmately 42.0 km) in 2 hours and 57 min. What is the average speed of the *qc9zhu) c dm5/rz7t zfk9b 1yrunner in m/s?

  A car travels 90 km/h. How long does it take for ij;kb6. 4eqsatt to travel 400 km?

  A ly (light year) is the distance thqy5-vr u,s0 v wxkj ps:z3cy+3at light travels in one year. The speed of light ipk+y3:sw uq,vsrz jxy5c-v30s $3.00 \times 10^8 \; m/s$. 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 s60hjvrl5 el (ptraight road and you look to the side for 4.0 s, how far do you trav6 vpe0(5lhrjlel during this inattentive period?

  If you run a complete loei,.n(fl t6 jmz.to2o op around an outdoor track (400 m), in 100 s, your average velocity ijl .m e,.(io2n6 zttofs

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1idkk8+jid v6/ocwg 3)ei e4 t:.0 km east, then 1.0 km north, then 1.0 k6i/ e4v3eko 8kj g+t:cdwi d)im 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, then 1.0 km eaz,eksdi7 i2ng3 :fbku*7 ij3j st, then 1.0 km north, then 1.0 km wes:z3ikbfi7n2j3d *e, 7ku sjigt to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a ws832jpnx*gr, q/ i h)*hpg* jir4;8itizyqd qeekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 rj8hti qq hsn z iq;2*irjgd4 **y,g xi3p)8p/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 km at 100 km/h. What is uma 5mab0 2k+lthe average speed of the motorist for this ml 2mak0+bua5 trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What 2 3;.if ckiplhis her average speed f2i3i.pk lc ;fhor the trip?

  An airplane travels at 300 mi/h south )gvh5m2d zb +j+ m;gpffor 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trig)jg+fbz5m+ p h2dvm;p?

  In a 400-m relay race the anchorman (the person who runs the la)lm6 u4ihy s)o(or6aast 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 wh66auiooy4) s r lm(a)hen 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 t+s:cg /f -rm*8w mwncsx;sf, ua *z+tlo a stop after 8 s. The car's average velocity during deceleration was 39 km/h. What was the car's deceleration while slowing doww*l ; f/*nsg+wt zx-sa+cumrf m,c :8sn?

  An airplane increases its speed from 100 m/s to 160 m/s, at the avera(s ysck5jp/ddj h40m /ge rate of p5mh dy(js k/d/c0j4 s$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h w xl2y7uk95 pqdnt8ka u4g*f:accelerates 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 and acceleraty4g 2h esbe wna4;26pdes 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 pxoy; qq2q b(2then speeds up with a constant acceleration x2 pb;oqq2y q(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 4.9 m/s experiences a15byrj afadsy5+mi*/uy r *;rv ou4a- constant acceleration of*fvd 5y/y rumyro1a 5; sa *+abu-ir4j $4.2 \; m/s^2$. What is the cart's displacement during the first 5.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) wi-l) xm (+hmf ddugfbv;n;6+xhth a speed of 241 m/s strikes a sandbag and penetrates a distance of 43.95 cm. What is the averagehdb+ug+;)m(d;m xhn -f6xvlf acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It- x1-bsnorva c9gn 7+a reaches a speed of 42 m/s at the end of the catapult, ora+v-abn 7 cn91gsx-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 acceleratj- gp 41ik,gzwau4se wp;pz;3ion 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 of5n v,puzqq8d e zw2s*j2a,0m0hz *zcw 200 m. What is its average acce ,q8dmc2z a ,hw*qznwzv*jpz2s0ue 50leration?

  An object starts from rest and undergoes uniform accele-.cdnr0mjx-+ ftfa4i dhel ;;ration. During the first second it travels 6.1 m. How far will it travel df -nl caidrmt- 4+.;dh ej0x;furing the third second?

  An object is moving in a st,/t,ccet2 gw oraight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it cttoge /,wc,2 move during this time?

  A car starts from rest and accelerates z3*zg;tirm/3 6ckks6uo + cpruniformly 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 bpk/wz8.r(pbcc eg51 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 waitingj.o+ glssw: 4d at the intersection starts ahead withw4s:l g.s +jdo 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 :jcnjats/z78:npy 9o upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity:/ojna7 : p9zct syjn8 is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface of pl54eqrv jxq 4q;0nlzm, anet X where theem;4 qqlxj qrnz54,0v 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 upward with a sp x no/4q sz.6 6efm 9fqbrr-n-*lqu(yeeed of 15 m/s on the surface of planet X where 9 q4rqf6e/n-fursl .6 (xnqeb*z moy-the 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 speed of 14 m/s on thz)r:bhq+k8 tq,foyc +e surface of planet X whe 8 orchk)qbf zt:q+y+,re 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 ahokv ..c:a 6-)cckgps. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch iogp )h.cakc.- 6cav:kt?

  A ball is thrown upward at a velocity of 19.6 m/s. What9+3knbu2ubwuz: p1 ts is its velocity after 3kuub u ntb:2ps+9z31w.00 s?

  A bullet shot straight up returns to its starting point in 6 s. What is the iq.ry ,ko6vqr ;nitial speed of the bk.6rqo vyr;,qullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it ttp4go5bn b0 be2w gxnp4n27b+e-4ya yake to rewbanb 4 5o+724nt0 ye -gbgbn2pp4yexturn to its starting point?

  A ball is thrown down8y123tln tko oward from the top of a building with an initial speed of 22 m/s. It strikes the grokoony23 18lttund after 1.7 s. How high is the building?

  A ball is thrown straight updv tf(di:s3,ep*tz9r with a speed of 30 m/s. (only fill in numerical value in thz,*3 ftdti:rdv 9 pes(e 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 speed ofo2 bjj p;9i bi,,b75ecnejk+s 49.9 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 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 velocity at5qkm3 k:2tmk/ f1pda a2)irhb t = 1.0 s?

  In Fig. below, what i6qmcox,ez 2 u.s the velocity at t = 2.5 s?

  In Fig. below, what is th(nm.-g qokofi f 7ox829 si1lde velocity at t = 4.0 s?

  In Fig. below, what is the vg/5 e .vvp5/mllmn 7qgelocity at t = 5.5 s?

  In Fig. below, what is t6ik-o l i:inl1he average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocitrjoj3/ na 4eg3y from 0 to 6.0 s?

  In Fig. below, what is the accel6y3j y1-eamf seration at 1.0 s?

  In Fig. below, what is the acceleratimtq ;j8y )uglh55c x,non at 3.0 s?

  In Fig. below, what is the average acceleration fcl yx0y-z.kko-m c,n6 rom 0 to 5.0 s?

  In Fig. below, what iu afwmya) )6a -y)mg d(hh7g-is the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the disxe lcw *fu5n7xwdo8i /d)*gt;placement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {n.gaqj9y j5 w ;(,nxmbspeed|velocity}

  An object can have a varcl;jq11on8s. 5s3se.d e jd ecying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration ,fr de9ly,b2s d,+kbg is positive.

  If one object has a gre46kd; avyd60yd hvhk4 ater speed than a second object, the first must have a greater acce 6vhky64;kdy4vhd0adleration.

  Two cars emerge side by side from a tunnel. Car A is tr,;6inxt 0jy ghaveling 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 incr6kx9+yk5ugnlrta6+, g sf0tceasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves tq8 lb.o-fnecbhm. 1i0 he bat with a1 mbcl.8oenhq0fbi . - 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,r 0(re ejla+d: what is happening to its acceleration, how does it chane0(el+d rj:a rge if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, :roc7 n*c;ikh rsx 6od.oa3h/ how does it change if air friction CAN NOT be ignor/ic3r h7 so.c 6rhnkaox ;:do*ed?

  An object that is thrown vertically u6wy/*l n-/w6r t+*h awor2zvq9 udn pbpward will return to its original position with th- /ph6y r*6ouw+/l*wn an2 qv9rdbwzte same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration a/tpv u+mm um9.y utsxk4+q/4dt the same time.

  An object can have nonzero velocity and zeroo9y sinj8 qs- 9gge-z+ve5dz+ acceleration at the same time.

  An elevator moving from t:ra zd(*wf3s7m 9sis8aq1zvjab- lo3 he second floor to the fifth floor making no stops along the way has ze3 v 1 saws37zizqfajrl-8 md 9a*obs:(ro acceleration all the time.

  A rolling ball moveson j: 0p7zw:wl from $x_1=3.1 \mathrm{~cm}$ to $x_2=-4.4 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.1 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quadl-;r1c yd y;erter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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 106 m a: i5rh3)k ycneway in 8.9 s. It then turns abruptly and gallops halfway bac:i)he 3kyn 5rck in 4.6 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 from rk5xrj 0/la- d$11 \; m/s$ to $23 \; m/s$ in 5.9 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 fro4i480ty a kfnrk n:tg3m $19 \; m/s$ 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 sppx k di(3uj81teed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to:ryn :-e5p27-w l dhqn sbb/er essentially top speed about :l5 y q/ hw-e-:bnen2br7sprd$10.9 \; m/s$ in the first 10.4 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 frki( j(b0nzo*r st5ng+ om a speed of $15 \; m/s$ to rest in 5.16 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car l;otd ; gq*vat*k0 csq2eaves skid marks 92 m long on the highway. Assuming a decatskc 2t ;q;*do0g vq*eleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goinamlpgsxvv e4 7 7/ hsfmn82 ayq2s75y7g $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. After f8s ig 8-bywo8exactly 27.0 min, there are still 1100 m to go. The runner must then ai8wo -8 gf8ybsccelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$