Suppose that an object travels from one point in spwy, :t:por)r sace to another. Make a comparison between the displacement and the distance tra :wtp rry)s,o:veled.

  When is the average velocity of an object equal to the ins.r :,zoeqb jl6.:hjuatantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in tmtj 2s uhn0if )mv:098 s". This is a descriptio9t0t)m imj0s:2fvhn un of

  An object moving in the +x axis experiences an acceleration o/ ntaywg4 kl10f $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down as ispb 4jp/6to- it approaches a traffic light. Make a statement concerning its accejsb 4-iop 6pt/leration.

  Suppose that a car traveling t;pbkd 1pwud+u7c1dmz/ fb;2f o the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its 7/mcu2 1d;d+pfkdfuzpb; b1 w acceleration.

  Suppose that an object is moving with a constant velocity. Make a 9pfu /.h i*xbnstatement concerning its acceleraif*/h.bp 9 unxtion.

  If the velocity of an object is zero, does it mean that the acceleration is zeud9y)ytf k b,6ro? Support your answer wt 9 ,6bdykyuf)ith an example.

  Can an object's velocity change direction when its accelerat:uim oz..ade 3ion is constant? Support your answer u3..am:de oizwith an example.

  Suppose that an object is moving with constant acceleration. Make a b0m(v-6( q vbsibbfb7 statement concerning its m7v0ism6 b(v -bqfbbb(otion with respect to time.

  Can an object have increasing speed while its +ymaqqu(ro 5(1 g8y3qu ac2cor(d h.k acceleration is decreasing? Support your5.gku(2 yd (amh3r(aoyquq 1 r8c cq+o answer with an example.

  Suppose a can, after yva -3 hgd)1zu jnmwnd1y.;t 0c86fehan initial kick, moves up along a smooth hill of ice. Make a state81we g )6cd hhzn-m;30judv1nya.tyfment concerning its acceleration.

  Under what condition is av yjhun3h*ho3 330)7pkp-yhiy(jkfyo erage velocity equal to the average of the object's initiay ohn3k3j3h y *-)yf3i (7kpphojyuh0 l and final velocity?

  Objects A and B both start at rest. They both accelerate at rhpk7yuv lec7r6hu 67x zl56,the same rate. However, object A accelerates for twice the ty66v5h r6cupxh k 7 ,l7ul7rezime as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both starc 3 /+d* b*5bnd5x:ba j5fvzqugcu 5gbt from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by obc b n*3g : d5bxa*/5q5 +dfbjvcu5ubgzject A compared to that of object B?

  When an object is released from rest and falls in the aoz ),rag;k6tspw+v, z:fpd, 9t ki t*absence of friction, which of the followit+ atdzf a ,w9g *ptksz:);,k vio,rp6ng is true concerning its motion?

  When an object is released from resh 16c; alz f-2wp2uqbut and falls in the absence of friction, which of the following is true concc6hapuu-q z 12f2w ;blerning its motion?

  Suppose a ball is thrown straight up.vm1xk f;um4 +lhv3gc+ Make a statement about the velocity and the accelerav+g 4cm;xv+1 fuk3lhm tion when the ball reaches the highest point.

  Suppose a ball is thrown straight)obd26u(rcpnhy,miy52- cx j up. What is its acceleration just before it reaches i6hu po5md , ryx- 2(j2i)ccnbyts highest point?

  Suppose a ball is thrown straight up, reaches trcew73jijmma r7p *p: p9(:ma maximum height, then falls to its initial height. Make a statement about the direction of the velocity at:*:rip7a3mp m (7jmcjwpe9r nd acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to 8j z,te )vq1wvits initial height. Make a statement about the direction of the velocity and acceleration as the ball is cov) j81tvezw ,qming down.

  Suppose a ball is thrown downward ingq m/ *iawo+5cqv6prc(9r mhtq:4j 2u the absence of air resistance. Make a statement concerning i+ tq(4:/m*i5gua hw 2vrrmc6qqjcpo9ts acceleration.

  Suppose a skydiver jumps fromc cpd/f0 0w2rm a high-flying plane. What is her acceleration when she shed0p wm/fc2rc 0 reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identibd-jv u0 5r9dg o,dikc.:em,p 5;vfe+(tkpi mcal second ball is thrown upward witg 5v+mpe :(e d;rd-,0mvu5i,f9 o.ik dbtckjph a speed 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 building. One second late9et) mistm; .br, ball B is dropped from the same building. .msm;9) etib t As time progresses, the distance between them

  Ball A is dropped from the top of a bz vt42s91z0 pan8azaluilding. One second later, ball B is dropped from the same buildina4v psaa2z1z 0znl8t9g. As time progresses, the difference in their speeds

  Two objects are thrown frompgv 0 x s)3fdwz5gs40p.t 6hrt the top of a tall building. One is thrown up, and the other is thrown down, both w rt60ghs s 5p.xz4t0dpvgw)3fith the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from fu2n;ab;onp4 v b3ho+ the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistan2hb3+b ;o4pf v;uanon ce. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The n mj)p778myyedjqf**position versus time graph of this object i*j7 e)7p8 mnfyyd *jmqs

  An object is moving with pwws:z(:f:i fl2roof e0u y3+constant non-zero acceleration in the +x axis. The position versus time graphfw2z:wlo(i:u+ o3 :0pfe yrsf of this object is

  An object is moving with constr cuj6iu(0*ri ant non-zero velocity in the +x axis. The velocity versus time graph of thisirr0 ( u*i6juc object is

  An object is moving with constant non-zero accelv8ckwe ):mj 9 cm(9uoperation in the +x axis. The velocity versum: 9kcv ej8wco(9mu )ps time graph of this object is

  The slope of a position ven**7a +c ndf+5tpn.(gz uugpb rsus time graph gives

  The slope of a velocity vers)esuod ap9ne9j3 8zyc 8.xb k6us time graph gives

  The area under a curvep yphaw/c(s68u7i ; uil bp4i- in an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph giveyj-43 ubnf qd q; lg5qua0vv41s

  If the position versus t(m y* 0ad6pbdd2ohi.jime graph of an object is a horizontal line, the object b(. 0jd*m ddaoph2yi6is

  If the position versus time grar v(wpq((8*cnpx q) ozph of an object is a vertical line, the object isqpoz p8wcrv((*x( q)n

  If the velocity versus time graph of an object is a horizontal ling9j ,9m */hlhnm1pu5 +lg* xdfmif4yde, the object iml4gjmxmh h9 +1u*lnf* d/,9p5ygdfis

  If the velocity versus time graph of an object is a straight* ft*kz5j8mx90lys sq line making an angle of 30 degrfj0km9 5 lsqy*t*z8 sxees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distanchg2y k63 ub7fke traveled and the magnitude of th3f7 b6khkg2uy e displacement vector.

  A boat can move at 30 km/h in still water. How long will it takeyz it)kxv5k0vt58j 4 k to move 12 km upstream in a rty k8kvti0 5zvkx5)j 4iver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mizjlq:4h 7mdi -.wmg+g = 1609 m)

  What must be your average speed in order to travel 350 km in 5. vkzjzl8c-),g3bp* losne0zn6tp t00 15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. sbq tphe unbiv5d.16.0 xl i94What is tbhbu v. ls4 1.609ipde in5qxthe average speed of the runner in m/s?

  A car travels 90 km/h. sf k ;sw(cnh:vu;ru1eia +*8y How long does it take for it to travel 400 km?

  A ly (light year) is the distance th cadjmt01mazeg7lum .,w7,(fat light travels in one year. The speed of light ,m 0,1ea 7mag zwu.lcj(dm7tf 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 straig6y8c 3/hon kug-ivcw 0ht road and you look to the side for 4.v6gun8 koc/w ic-3 hy00 s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), i 0apz,le )om;en 100 s, your average v lm)a,epezo ;0elocity is

  A polar bear starts at the Ndn,3oz/uyv 8rvnvt )5 yte*e+orth 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 starting8dt)nv *yoz n35yvue/,ert+ v point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travelsrp2-x zuy6q 4v 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting poiv2y xq6r 4p-zunt. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55f eda/pa8q8w rwbh0c,pd 7 eu)e95ud* mi/h for 110 miles. It then starts to wp7edbae5/pq u ua*98cdew rdh,)f8 0snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 kmefnd*q+ oiv8rde p8j:wdyk8l v 1f5hyo h8:15 at 100 km/h. What is the average speed of the motori vd:1oeo5j8drlw*i hfny v1f8 8k8ye +: q5hdpst for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 79e r t+xpng0/ z,z)nxf7m-q.h kbhpxh at 100 km/h. What is her average spxbqmp/0hn x xpef97+r -zgz,nh ) t.k7eed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at ft r3xr1vz92v250 mi/h north for 750 miles. What is the average spee9f32zvr1 tx vrd for the trip?

  In a 400-m relay race the anchorman (n0l ss06,s9yhfc o tk7the person 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. 0sts967ko0y shcf nl, 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 8 s. The v mxm89uuqvdu-f3z,34r riysa ,7rf 4car's average velocity during deceleration was 59 km/h. f r-z,iuq 3f4x a4r8smvurvm u,7yd39 What was the car's deceleration while slowing down?

  An airplane increases itu(qw 67 w s2w+lq.ouprs speed from 100 m/s to 160 m/s, at the average rate of . sqpr6o( 2qlwwuu7w+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the mhl1cmyv5/ltj98g ue43 dw -9dt6qs /lobhp*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 ab9cvk9 fj;gb,i 5arpz 88 ;huhccelerates 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 10w7 dvkm)rt;. s s. It then speeds up with a constant acceleration)k sv;rm w.t7d 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 2.1 m/s experiences a constant accelerationlz,4 z3w8jwf1salx flhve , 7+ of z ,,z hv lxl38f41+7l fseajww$4.4 \; m/s^2$. What is the cart's displacement during the first 9.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 476 m7m/ e+ upg-o9q0mp2rj4p.q nad b gt1a/s strikes a sandbag and penetrates a distance of 55.65 cm. What is the average acceleration,e4p gpm71/ud+9parbj- ao g0ntm 2.qq in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrieruj2a3ysr)d 1 e. It reaches a speed of 42 m/s at the end of the catapult, a)ey3u rs2j1da nd 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 acceleratiojpiew1d7 r8m4 n 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-5kd dpz2dpvl ut08)g is its average accelvpddpg ) utk20 5dz-8leration?

  An object starts from rest and undergoes uniform acceleration. During thkblg r/ki1:ne.hv x):e first second it travels 2.4 m. How far will it travel during the third :bk:k)hng1r i l/.xve second?

  An object is moving in a straight line with constant acceleration. Ini5af (y n5,pomf)gl 0fntially it is traveling at 16 m/s. Three seconds late)naflfp(yo 5m,nf05 gr it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and ace b0. 5.nv2 cdm+uvwpfcelerates 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 can decelerate at q- /taofn8;f:( bmsbg 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 +(f0r-s euq4anke7k b green, a car that has been waiting at the intersection starts ahenu ba4(rfqekk7 +-0e sad 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 tro 45-3g3sxvx3 3klwzjc3dx upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is st3dx3vjc5g3w3 -x 3rx kzlo4 $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on l6bvamqjl7t-kq0e rkviz 9t r9//4: rthe surface of planet X where the acceleration due to gravitk/ tai:-9769rb l0lq4qrv/ jmkrvtze y 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 the surface of planet X wh; i;15ui lvd6zg fzv(aere t; vdiuaz;i(6vfz1g 5 lhe 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 the surface of planetex3+q9kit wn m x*8.e,bk ae)5lu1zua X where the accelexebk.+w1a qul8 n ie9zm*at)ek 3x,5u ration 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 fhh1l4fhsk */rehn gv22*gp( uriend holds a ruler between yonhesp22hfg u h/(v*gh l1r4k*ur 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 velocity of 19.6 m/s. What is its velocity after ,rj jo2 us./hd3.00 jo dhs2,./r jus?

  A bullet shot straight up returns to its starting gp 8oh))j 01wxnk-kz 8 i:bcnjpoint in 4 s. What is the initial speed of the bullet?ik0)nb- )o88h:1pjgc zxwkjn

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it ta63v+5pv s /u)susno) b(hjgtwke to return to its star+jhguw3)5p s b/ nsvst)u(o6vting point?

  A ball is thrown downward from the top of a building with an initti*/li /r sbad20xv m0p5j.yxpu y9g9ial speed of 26 m/s. It 0a/by 0mj9ipd5yp9xt /ivluxgs *2r. strikes the ground after 4.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/um-oy7bc ki h0na6,h3 s. (only fill in numerical value in the b 0i-bh3n6 ,y kamuc7holanks)
(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 str(r oimaqb,8y/pnjb s7p;38xai9 bn9d aight up into the air with a speed of 28.3 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0ar of*m5f +1z (as ohjbn03w1t s?

  In Fig. below, what is the velocity afckr)0dt xs) :t t = 2.5 s?

  In Fig. below, what is the velocbe66fhtr0i p . pb:7):c0v l:tsyktp mity at t = 4.0 s?

  In Fig. below, what is the velocity at;n/p-e y geqpu tt) 49wwche-7 t = 5.5 s?

  In Fig. below, what isl+vfm9g.k a6i bhvy48 the average velocity from 0 to 4.0 s?

  In Fig. below, what is the ( di.alhst9x6average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratii1os uql qt5i.9 +fak,zybxn( a78jh*on at 1.0 s?

  In Fig. below, what -z(vcygmoz9x1, zeo z/eez84 f- jla8is the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 2ewm0w/gof)dh ez,4 )iz g hq)s?

  In Fig. below, what is the96)gbq g1qrqz average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displag imkkc5,0y/bcement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity:eaok1l(k j/l? {speed|velocity}

  An object can have a varying speed if its velocity f;/go0urm2(iq v-r r mis constant.

  The velocity of an object can be:qq.x 3xyrlv61rga 5x7xg(c k negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a gr+ ,a 7b jaz;8h-tmr,vdrnvz(kz zjhkd,+8vmrtbna(;av, 7r- eater acceleration.

  Two cars emerge side by sideev y3o 045(a*h)ws3nkt8d gckbhx v1+xdk7nh 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 increasing in speed as its acceleration de ul4p82n8d wtd -n64bvse/qwfcreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat qjp b k,5,5ux5 ) b8olqal.zsn6yfn8wwith a speed of su65 .k,np, fb5y5xwqo z8nj qba)8l l$120 \; km/h$. 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 accelj3 +wcu s:3w pg/-wbleeration, how does it change if air friction is ignoc 3wws: -w p3lug/j+bered?

  As a freely falling ob* ;f2qpqay;arfarzu4 v 5u50 jmq ;w:k.npkp,ject speeds up, what is happening to its acceleration, how does it change if air frictioy.2apkwf4 n rr zk ;qmjqvaf5u5;p0,uqp a:*;n CAN NOT be ignored?

  An object that is thrown vertically upward will return - og 1ge4m;bidyv/woio;w,n. to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will -yoo .v;/ m4 wig;ndoiw1e,bg this result be altered?

  An object can have zero velocit-7z fzcpaa66yy and nonzero acceleration at the same time.

  An object can have nonzero velocity -q 6 iei2z:xjdn5vrxus6o0x0and zero acceleration at the same time.

  An elevator moving from 4 sqo qe j.(6yc3dayc.the second floor to the fifth floor making no stops along the wayeyajq c.dc.34q6 (oys has zero acceleration all the time.

  A rolling ball moves fromsx-9ey yaz 36qsqrw0/m gf7m5 $x_1=2.4 \mathrm{~cm}$ to $x_2=-6.7 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ 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 $t_1=-3.2 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ 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-milex b(caf+n0j 1jwk nh)+ ($1 \; mile = 1609 \; m$) track in a total time of 10.5 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 linbl 9ot. kd24dqkdna0,kftn4, e, moving 102 m away in 10.2 s. Itdd .klqt,2b0otf, 9k4a4 nnkd then turns abruptly and gallops halfway back in 4.7 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 fro.rwtn-.9brmqf( 0 km;i/o gsw m $11 \; m/s$ to $23 \; m/s$ in 4.8 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 frobhmlizp84n( oz-6 5qhm $23 \; m/s$ to rest in a distance of 61 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed s b:h/u68xbsqof $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top soq ;n- bl;g41hspkrf(y9- ewppeed about ;-s1(pwqb- h4ne rlkfp9 oyg; $11.0 \; m/s$ in the first 14.4 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 from3 s/f1 uq/sdva a speed of $17 \; m/s$ to rest in 5.50 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. Ass joka1,) sceli)3((9obgamb muming a decele(em )1 cb(iogla oa,s)b3jk9m ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g of.ei8vz )lzkt (7n0ge,d dc,oing $25 \; m/s$ 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).    $m$