Suppose that an object travels from one point in space to another.r i nd3rik*k6+xhfd+scp:/l 4 Make a compa r xf+p43kl:hdks/ n6*dr ici+rison between the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantanev.5bi;6tzkm zous velocity?

  A new car manufacturer advertises that their ca2cw w ots2f 5akt-.x56j1ga bur can go "from zero to sixty in 8 s". This is a db2sxa2 jkc.at55g f o6wwt-1u escription of

  An object moving in the +x axis experienceck 27yqijlwn as+3:g/s an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down as i/hlw f v ;cgox22fuye.fv9:j, t approaches a traffic lig c f uwgf9l,xvoje:yv;./2fh2ht. Make a statement concerning its acceleration.

  Suppose that a car traveling b(9t6qsuu4q: vg ak+ uto the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.as9g6 uu4+(qutb q v:k

  Suppose that an object is moving with a constant velocity. Mahevzmim .lm1 cc6 (,ugcmw7: 8ke a statement concerning mv z .hec17um,8(cw:mmi c6 glits acceleration.

  If the velocity of an object is zero, d 0q8 a26wze6lf ijagu/oes it mean that the acceleration is zero? Support your answer with an ej68 ala /6gufei0wq2z xample.

  Can an object's velocity change direction when its afin0a ;bdl* n+cceleration is constant? Support your answer0idbl ; n*afn+ with an example.

  Suppose that an object is moving with constant acceleration. Makuc 1 ,.)jbp yi -sn;hxd:hh).csg0se ke a statement concerning its motion with respect t;i.hj0)xcgeu. :-dn 1) shpbcs y,hsko time.

  Can an object have increasing speed while it-bmkagti -a +szj e5 s5oy7b0*s acceleration is decreasing? Support your answer with an ex7i mgbt5jys50oa+k*ab sz- e-ample.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. ex/3hdlga0n/ltvc/ 0m7bbkwdr8 9 t) Make a statementt0 bl ) rn8gtwexv73kdm0l d a/h9c/b/ concerning its acceleration.

  Under what condition is average veloi pt3goeq08o.7+gx370kf/dk ycp hwbcity equal to the average of the object's initial and f t0e03gycp7xophwikf73b . okq+d/g8 inal velocity?

  Objects A and B both start at rest. They both accelerate at the same rat;tr v+et-qr- bqm,7*tm)mef s 9obma4e. However, object A acceleratese+ m,qr f;m-bv-)7q totrsm*tma9 eb4 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 bothl-w0j 0 p128 tkkjfajy start from rest. They both accelerate at the same rate. However, obje-k00wl1ajp8yt k 2fjjct A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest 8;y+e 9 1:8lthy q j)cnudezi,dta;apand falls in the absence of friction, which of the following is true concerning8p, tu 1;iej;t+9dn)eyh dz8 q:cyala its motion?

  When an object is released from res+i8qi /kwm*ozt and falls in the absence of friction, which of the following is truki *8mqi +w/zoe concerning its motion?

  Suppose a ball is thrown sa./9li-j zlhntraight up. Make a statement about the velocity and the acceleration when the bai-/zlahn 9lj. ll reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just 3l .1r m0vaxvhbefore it reax h1mv3rvl0.aches its highest point?

  Suppose a ball is thrown straight up, reacp)tv9k .q,vn5 r 2vcswhes a maximum height, then falls to its initial height. Make a s5kp9vt.nwq cv2 r, s)vtatement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, b ej8d56j45+ zq:x4owodotk qreaches a maximum height, then falls to its initial height. Make a statement about the directionbz+5jq k to8q56e xoowdjd 44: of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown dowd/xr5z d6a2iynward in the absence of air resistance. Make a statement c5zidyax6 /dr2 oncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelewrj5uzr(m (/nration when sw5(ru mjn /(zrhe she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical seco kvz)lbopl;84 nd ball is thrown upward with a sp)pzbkv4 ol8 l;eed 2v (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 buildin +yr2qnfv.4j) jd210*h5sziyjac /u upw7p ddg. One second later, ball B is dropped from the same building. zaw2d v qr4 p7f/sh0)nujcdj+y .51y 2ujpid*As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is5 y-c xpwdy.,f dropped from th.y,ypcdxf-5 we same building. As time progresses, the difference in their speeds

  Two objects are thrown fror5+y ph py*w c*6/puemsv,qi)m the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial 5 hp yswpc/ iqyp)6ure+,v*m* 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 skc jq.0lzgp(8hla2k 28 -aunwtraight down from the same building. They are releal0z-.(lq2c 2jg8nkw pu8aak hsed at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the + dv 6hs7hmaul/b3t/ of2qs1+fx axis. The position versus time graph of 6 /bmus+h2aldvsht /1fofq37 this object is

  An object is moving with constant non-zero acq,trl 4.n .9sxr*fdfnceleration in the +x axis. The positr.t.qs9 , nnlrx4*dffion versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The : zcn,-wx ;wjrtu-kv u;5(u3kay 7; fbjgu4 lpvelocity versus time graph ofn;kpzvl-g4 -5fjxj;t k b,ur:(3 yau7w; uwuc this object is

  An object is moving with constant non- 2v)4 kz9a-g1d 2b u:ijtykixhzero acceleration in the +x axis. The velocity versus ti:t k2b19a ij z2)giu4kxhy-dvme graph of this object is

  The slope of a position versus time graph gx*t6k.84dke2kfw vxg ives

  The slope of a velocity versus time :dw5f pkc x +3(cx9c -qwg7y3gll: etrgraph gives

  The area under a curve in an acceleration vgd9bn7a x en 0xg0z/1o7u.ctzersus time graph gives

  The area under a curve in a velocity ve20s qh/vye5qg)2odhi rsus time graph gives

  If the position versus time graph o+:*gjccuv*-o-gl4w(o jr pnof an object is a horizontal line, the object is o--c*ocpjn(govj4gr:+ul* w

  If the position versus f:ipk9 xv28f ttime graph of an object is a vertical line, the object is kipfvt8x2f9 :

  If the velocity versus timeil9ds40ov :b (f q/lb zcgx86x graph of an object is a horizontal line, the object :4 9zslvo xcd0q6gblfbix/8(is

  If the velocity versus time graph of an object is a straight line making an ang-1-wtzze jh ezlv10.gd( qui 1le of 30 degrees with the timhzdg0j(etz1l 1 v.qe1-uw-i z e axis, the object is

  An object moves 15.0 m north and then 11.z t)p f/7/zo1bhq0:0 hg pflsa0 m south. Find both the distance traveled and the magnitude of the displ /1h p z0 :h0q7)sbo/aptzfglfacement vector.

  A boat can move at 30 km/h/myqmk 6amaxk v:lh)n (qu2/1 in still water. How long will it take to move 12 km upstream in am/qh): /kmam ay6lukv 2q1 (nx river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 + v3;ogtphbr8axld01mi = 1609 m)

  What must be your average speed in orded,u9irtmw d.e 9b+dh:r to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours spyc/9 r9ld-d(zj 3 cband 57 min. What is the aver sl9b(rp y/93jcd- zdcage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400eo vd*cig e6okf; 4m29(7e wwj km?

  A ly (light year) is the distance thatsrg: nc j80x4uvaxhe9m6+ p9 f light travels in one year. The speed of light is 9jhp xfr c+g4s9806u:m van xe$3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h x8yibw)j:r :.a.joymalong a straight road and you look to the side for 4.0 s, how far do yj8jy wo. b a)ym:x.i:rou travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 1s hm 3g71t8cfh00 s, your average velocity iss 7m 8gch31fht

  A polar bear starts at2jwcyvifq )728,t gjj the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1i)tjcj, g8jyq v27fw2.0 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, then 1.0 km zt;o3urrgf 0:ml,w (veast,;rw t 0fuvo3z(g :m,lr 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 velocity?

  You are driving home on a weekend from schone g8cos okhm d9a(+07k2txg3 ol at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. Yx do0k+sh (7at9g c2m38noe gkou 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 ilf rbphf r.nhbs 37( 5jw484xes the average speed of the motorist for this t4fn87efbrsj p xbhwr(. 53h4lrip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wha xb4bp7hu e:d :z1vt*s5+3,vkjyxw l mt is her aver 1 v 5wl3, e+bzyjs4m:th bpkvu:7xdx*age speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 2zqohsd2mn :)0xp6 vt 550 mi/h north for 750 miles. What is the aved :tovnqs)5zmxph206 rage speed for the trip?

  In a 400-m relay race the anchorman (the pewzjk c/0-++bes.c.rx ho-fgf rson who runs the last 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 l shkbzc/g.+o e +crf0f. --xjwead 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 comeslv12v:pl i( avdzd :wua ujzj;1 e3t5. to a stop after 11 s. The car's average velocity during deceleration was 56 km/h. What was the car's decel;zwuaa:j5 3uvp td(ljviv 1.2lzd:1eeration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average ratei0 jl)gsj;,yy+ llv a: of l;:ayljivly )+sgj 0 ,$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thq9u sxp,(t /vwe 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 a9t 5dv s:fe5egsb uy9jsj(v0 *ccelerates 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 ) eyv)lh da0d.xk0ik , xcc+8zthen speeds up with a constant accelerationxh8c z) a+.d 0,)ikvxc 0dykel 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 5.6 m/s experienc6erq y v8:azr1es a constant acceleration o e6zrayvr q81:f $1.8 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontallrxw1/9 h6w xt4(( u6sofnyl uoy to the right (+x direction) with a speed of 338 m/s strikes a sandbag and penetrates a distance of 43.88 cm. What is the average acceleration, in 9f (h6ww/4(or6ouxylut1 nxs$m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircrawt)/g5co t /rxpfp;,7 ps/urpft 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 the lengthr)s tpucgp o,/ fw;p/t5r7 px/ of the catapult?

  A car starting from rest moves with constant acceleration of ww(dwnaq 5s5 84clr:b$2.0 \; m/s^2$ 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 o tzu*8n6r0j7j tya c je(h)f1distance of 200 m. What is its average accelera ja0tfcy uoh tzj1)7rn*(je8 6tion?

  An object starts from rest and undergoes uniform accelepoxxo3 j0bx07 ration. During the first second it travels 0pobo7 3xjxx02.2 m. How far will it travel during the third second?

  An object is moving in a straight line with constant accelj:yejt1r 5f v.j 1bo2geration. Initially it ist j oj.:ejvyb21f15g r traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleratesc;ep)*nerdf8 r p(s. b 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* e4,wckyrv/ 0d6k i-sk(e fez road can 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 ca0t*5 4v7fjnsenmiu w* r that has been waiting at the intersection starts ahead with a constant acceln v 4* eswui0njt75mf*eration 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 whezxxlzqj53iz m*gpy- 8 2x5 z*yre p*z2g53z zx*qmiy j85-ylxzxthe 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 speed l6b/cuus5 p4b of 12 m/s on the surface of planet X where the acceuu4b6p s 5c/lbleration 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 speed of 15 m/s on ths cm5. )f4cmr ,mq;owxzqx91re surface of planet X whero 4cfm s,x mx5r;9mw1.c)qqzre 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 upe o p0+tmdg/rg3w,7 jgward with a speed of 14 m/s on the surface of planet X where the accele/,jd mgrwg3oe 0p7g+tration 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 than0a3hrfzp( * cb.vts6qbpc39w 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expe9b30whcq* sprzpfv3. ba6tc( ct the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after03cgh5o.yx k6o i fnp5 3.00 sog50n fy h5x36.pocik ?

  A bullet shot straight up returns to its start i1o:aksz(ai f.z(xwchx8v,6ing point in 20 s. What is the initial speed of the bullet?1cwx:6o (xhi(kia8.z avz, sf

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it takec)brk i.c. t7o to return to crb.t)k ic.7oits starting point?

  A ball is thrown downward 4wgu-f dml,5fxe9tsugf/ 07 h from the top of a building with an initial speed of 7 m/s. -4x0f d u mfeshggf/9,ultw7 5It strikes the ground after 1.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericalc ygm*rnvcz+449** .kjcowqswq 1fi 2 value in th1*qv4 2* ccfmswwqojgi4+kr9 .ynz c *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 of 3( bmkeu0+zxd0* cyq4w 8.0 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity v lzj0*5-q:mw yeavs 4at t = 1.0 s?

  In Fig. below, what is the velocity avdys9;a sl87k t t = 2.5 s?

  In Fig. below, what is the velociy; 4vi(u26-afcz g q d:4p4(czo uwdjqty at t = 4.0 s?

  In Fig. below, what is the velocitbd mcfzsqo*g51 k3-xcm,. o 0iy at t = 5.5 s?

  In Fig. below, what is to;u6 9sy8y gwshe average velocity from 0 to 4.0 s?

  In Fig. below, what is themb8 nc7id*1vf(b vt5g average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 xp6h; :i,p5-a b9awdu zsbp *gs?

  In Fig. below, what is the acceler68n2tet7ce;egxovg0 *pq vi- akk (z)ation at 3.0 s?

  In Fig. below, what is the average aiw ny)a zx/9e(cceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s? 4qr j 5 *qkz6lkhep00kgj1a/h

  In Fig. below, what is the displacement from 0 t2bha)hzrb+h307ko dg+3x ki e3w3r e go 8.0 s?

Does a car speedometer measure speed, velociti55hiw dwoh/4y4wi;:h5q tc yy? {speed|velocity}

  An object can have a varying speed if its velocifo-2/x7t6 lg3eduvn7q a9 hqi hr*rm ,ty is constant.

  The velocity of an object can be negative when its acceleration is positivrk b4gvlx 5mv n*4rh0;e.

  If one object has a greater speed th3y -rw 1ia pzn;hvp685 cmx- p3-xpbcfan a second object, the first must have a greater accelerat6f; i -cpn3zx5 8bwapxry -vmp1h- pc3ion.

  Two cars emerge side by sov5. j-dx9o plide from a tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increaszrj v6; *.ptcbing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves o3p:oj rg3tc9jxb(p 5s + efrq)7xcs 4the bat with a speesps4c5x 3tgo+fq je3rxp (jr:7b9o) cd of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happen cqzc(fji 2afn4/0 yz 25tx.eding to its acceleration, how does it change if air frict qn cd.f/xjcf5 ty422ez0za (iion is ignored?

  As a freely falling object speeds up, what is happe.i*(c: tn5 4b ogficsrning to its acceleration, how does it change *c(of n45c gs ti.:birif air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to itdvft8)ohf, nl0z+z+wbd 8i9 zs original position with the sazz+wfd 9)hdf,t znb 8ov8il+0me 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 at the sk-r sb;/5pn*afuh t q+ame time.

  An object can have nonzero velocity and zerk/n7be8xgh ae6 u y+o1o acceleration at the same time.

  An elevator moving from the second floorhm5p/nqdujs/a 3i (s0h )r-st to the fifth floor making no stops along the way has zero acceleiasq hdtsp0(5m n3/) ruh/ -sjration all the time.

  A rolling ball moves from cy6y l(f120-xkqimw -:h*4w zfce-srbg7v uv$x_1=2.3 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=2.1 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=8.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-ejj7 xg r(y)4hmile ($1 \; mile = 1609 \; m$) track in a total time of 6.2 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, movi5kr :smh3( d5wzavcq :ng 99 m away in 10.9 s. It then turns abruptly and gallops halfway back in 4.5 s. v: dwh3(ka5mqszr5:cCalculate (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 fr tw)u; iwquwb4o88 4xuom $12 \; m/s$ to $23 \; m/s$ in 4.9 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down fromf4mq;k 4:c2ar c0agzv $19 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speedr-z nm1 x)ua3d of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can bu 1;aqi0o pf a(w+g6m/ii6 spoprst out of the blocks to essentially top speed abouo/ 6;aiai+gf i o61 ppp(0wsqmt $10.4 \; m/s$ in the first 14.6 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 uniforq +fn/k bx9.w1tmp7bmmly from a speed of $17 \; m/s$ to rest in 5.94 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid markspuao bvt k(/fq492.i n 92 m long on the highway. Assuming a dece t fo vkunp24q./a9i(bleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc;w) bn) m/dsps ob/8tdk 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 thp/ rgda*:voy zfdd/ a;92-oike 10,000-m run in less than 30.0 min. After exactly 27.0 min, thegpozar ikoa ;d9-dvd/ /:*y2f re are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$