Suppose that an object travels from one point in space to another.t geu ku/5kw,clf1* 2d Make a comparison between the luc1g/*t,2k5fe wdk udisplacement and the distance traveled.

  When is the average velokx ea/( yk0 mve.0 s.h9yyjll9city of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that thea dm4wvq)-1x b/is*fdy3 e d-4r kuzo:ir car can go "from zero to sixty in 8 s". Thisxi s3kadfuyzd)1 bre- vmdoq*/ :4-w4 is a description of

  An object moving in the +x axis experiences an acceles; v bvnp 9 o0bo4v+hd/mze57vration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) be:- skv.w pidmexoj;00 gins to slow down as it approaches a traffic light. Make a statement concerning its ac0m:-0 .kej sixvo w;pdceleration.

  Suppose that a car traveling to thewl)tl qv/ :iv) West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its : it )lwl/q)vvacceleration.

  Suppose that an object is moving with a constant vyi6.yls q1cm)f uc: koawj8d5vy9k25elocity. Make a statement concerning its ac wm a52 kv .1yki9 qoc)jlf8sudy6y5c:celeration.

  If the velocity of an object is zero, does it mean that sz7 7 dei1awaj5v*e3oxe, g1tthe acceleration is zero? Support your answer with an z7go1w,d73 15a*j ie se exvatexample.

  Can an object's velocity change direction when its acceleration is condm ho 2:,dft8xstant? Support your answer with an exa:dx2, t8domh fmple.

  Suppose that an object is moving with constant acceleratioqftg1o )awkc t((z)7 ,7kjsoi n. Make a statement concerning itsgos)t(qc7fk,a t) 1k(ozi7jw motion with respect to time.

  Can an object have increasing speed while its acceleration z p- n/z-syo6txda*9ridag6(is decreasing? Supporgi9xza6soy(--/ tad6d *n przt your answer with an example.

  Suppose a can, after an ip ddds;2qjo3/n*hb 4u)j* wv gnitial kick, moves up along a smooth hill of ice. Make a statement concernijd**g; /d pdbuo23j)qhv w ns4ng its acceleration.

  Under what condition is average velocity equal to the k.rwxm)z/gu6 6;gzcs average of the object's initial and fi).6zxsrz6wkgug m/; cnal velocity?

  Objects A and B both start at rest. They both accelerate at the same rate.t/3l8tp crs pofu3y*1m72q sf However, object A accelerates for twice the time as objectot72rtq/sf 1u3*cs yp3 mplf8 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 acceleratee+76xjy9k aedhiwk( 3 at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A 6heedaxiw+k7k 3(j 9y compared to that of object B?

  When an object is renx:r* pwj-1/ikc,b kvleased from rest and falls in the absence of friction, which of the following is true concern1j*nkrp- cbk: xv/,w iing its motion?

  When an object is released from rest and falls in the absence oe 8* gp6 6im5;piyggptbwt/o/f friction, which of the following is true c i;ieg5 ot/pt*mgp/pb66w8 ygoncerning its motion?

  Suppose a ball is thrg13j dm qk)s qhzq *53zlkz0r.own straight up. Make a statement about the velocity and the acceleration when the ball reaches the hi1l*m0zjd qr5z qk .szk)hq3g3ghest point.

  Suppose a ball is thrown straight up. What is its acceleratios mv),c adqgjba:m*r(x a*h7z(dp e52n just before it reaches it ddj*c:a*5 av qhbam7gzrp 2((x)mes ,s highest point?

  Suppose a ball is thrown straight up, reache f1 d-yqk4 f* eh/n3wj8jrbeje;,0+ hyfre6hes a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelera +q 0ndh j1yf;hejk 3e4e,ej6rh8yf refw- *b/tion as the ball is going up.

  A ball is thrown straight up, reaches a maximum heigh+zalx n4trf +0;glz a2t, then falls to its initial height. Make a statement about the direction of the velocity and accel 2+4aagxr+0;zzf llt neration as the ball is coming down.

  Suppose a ball is thrown downward in the abs7sr;i7ra q0h x1ai- ikence of air resistance. Make a statement concerning its accel 7r ; iqxsaak7hii0r-1eration.

  Suppose a skydiver jumps from a high-flying plane.bbkg6vpx) ib13y -)mn What is her acceleration when she she reaches te mb)-pvybngxi1bk)36 rminal velocity?

  A ball is thrown vertically upward with a speed v. An ifn:t. rf nvbf y,w7n9l yp29(adentical 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 ball? (How many times2y,nlpvwf9.bnft ( :7nr a fy9 higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buil,yy,m5 w :h:gi8mzuat44n4lwmwuk - lding. One second later, ball B is dropped from the same building. As g8imu,n,lw5zw ly :wmy 44t4u a-mh:k time progresses, the distance between them

  Ball A is dropped from the top o+yutu:i- *sxghof b5kpz*8 4cf a building. One second later, ball B is dropped from the same building. As time progresses, the differexuhf 8*sb :-u+4c*y tgkz5oipnce in their speeds

  Two objects are thrown fromta ,d7;1wbbo9gxw tb:9di y;uow2q8 m 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 theyot2 by , 9;dqm:igwwaudo8;w17t9bb x hit the street?

  A brick is dropped from the top of a building. A second brick ilbwwy+e2pmurq/t3, q/4b 4 e7q 7snmsq(m 0aus thrown straight down from the same building. They are released b q(ulb puem,r/ es/t4+ wq7q4m27say0qw mn3at 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 axis. The posvupv28o jvhuyk5p : )/ition k2uju)8ovvh5/ py:vpversus time graph of this object is

  An object is moving with constant non-zerosvsnn* qo8 e2uh,so)tn : x31w acceleration in the +x axis. The position versus time graph of this oon:n3)2 htqs,8v *xo1e uw ssnbject is

  An object is moving with constant non-zero velocity in themog- z+, j 3xu* ap7psblxu-e* +x axis. The velocity vers 7 pb+ xuo,gspe au3zj*xl*-m-us time graph of this object is

  An object is moving with constant non-zero accn3 baofk8 +be6g,.dn vbkx6 1god1aa3eleration in the +x axis. The velocity versus time grapbao.kfg d a8 vd1oeg ,b36bk +x3ann61h of this object is

  The slope of a position versus time graph gives*,/qnxp4na l .,lq( whw0mkfw

  The slope of a velocity versus time graph givesk -8s6onsd7r h6kr )wyi8/xnqtrzx; (

  The area under a curve in an acceleration versus time graph gzpvdawvzq6x.oat,ugo *7.0(ives

  The area under a curve in a ve; b;re*3h fboylocity versus time graph gives

  If the position versus time grapho1hbdi ez;4 7 .vn8/wq varbx k:f.0ol of an object is a horizontal line, the object ibn4. 7q81b/o re;0wzk f:xv.dhova ils

  If the position versus time graph of an objectvrb dt:89ynn 0 is a vertical line, the object isynv t8d :rbn09

  If the velocity versus time graph of an oba*iw555ktk fg . kcz,dject is a horizontal line, the object i ga ,cz fwkd5*.5t5kiks

  If the velocity versus time graph of an object is a straight line jx6q ux-ohi 0kc 4q6n6making an angle of 30 degrees with the time axis, the objec ojhxki6n 4c 0uqq-66xt is

  An object moves 15.0 m north and thenwr4 sx2zzf .ylc8 t7+m 11.0 m south. Find both the distance traveled and the mzwr8x .zl2c+sy7 f4mtagnitude of the displacement vector.

  A boat can move at 30 km/h in s/6 7zgh ptksap,(h. jf9i)u mbkub4u0till water. How long will it take to move 12 km upstream in a river flowing 6.0 km/j z/9.sm ha)b(bupuk 7pkh4 f6ig0u, th?

  55 mi/h is how many m/)x:a0.kk ,xnbykgu 2 is? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in jh01/m 5e6:rwbn kqlh5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 0kp5 vj0g;kxzhours and 57 min. What isx05 zgp;jkv0 k the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tr*8 leqe5 -tdydavel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed bpq7d4a0u3z f of light fz 0a7qbdpu43is $3.00 \times 10^8 \; m/s$. 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 for 4e-pr,ha9 -ou;:gj qm 2xf/jmu.0 s, how far do you travel during this inattentive p jm h9me;pug,u:-rxj o2/a-qferiod?

  If you run a complete loop around an outdoor track (400r(ke1sg6qz 3 odwh5*km1xv8o m), in 100 s, your average vwmh 3q 6o8 d r51g*kxkv(s1ezoelocity is

  A polar bear starts at the North Pole. It trvz; xx29oj az0avels 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 takes 45 min. What was the bear's ajx9;o2z0z a xvverage speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.p:y1tpaz0m:ujs/.c qih8)c pkf . z7 i0 km east, then 1.0 km north, then 1.0 km west toi1)phza:8sp 7pt/k0 u cy .i.qczf:jm return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend pi(oj u ,w1ws/qa q hkq;efgk,/,9k1gk m8r; hfrom school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from sch k, w 11,f e8khwq9/rgqmq;pjiku;a, k/gso( hool?

  A motorist travels 160 km at 80 km/h and 160 j6nsr* o kg 4chsz+(t*km at 100 km/h. What is the average speed ot k* ssz(+jhc r*4gn6of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her xww *q;tj, /iuaverage sp,wiuxjq/*w t ;eed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h ap:/z v3.h-5 n auiipkend then at 250 mi/h north for 750 miles. What is the average speed fo-u/iea5 z i.h3ppnk :vr the trip?

  In a 400-m relay race-d9c09ynw qrx the anchorman (the 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. What is the largest lead the team B runner can have when the team A runner starts the f0w9qdc-xr9 n yinal leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to lu xvp 1-p*2jba stop after 9 s. The car's average velocity during deceleration was 45 km/h. What was the car2xu1v-j *pblp 's deceleration while slowing down?

  An airplane increases its speed/*7 9p0.m l0xgk unzopiw lrg9 from 100 m/s to 160 m/s, at the average rate of l npi w90 lz9k* 7/ogprgux.m0$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thelpz rk*t 7z tts4km40* 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 alt-3:ep r-v bxccelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then speeds up with a con6l)mfa;;ve gaw4z el ,stant acceleration 6l ;v,)azfg wm;e4lae 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 6.6 m/s experiences a,s8mu+:ceidn9kv f 4r constant acceleration o8 enf r+muk4:scd 9iv,f $3.3 \; m/s^2$. What is the cart's displacement during the first 8.4 s of its motion?

  A bullet moving horizon8r9x cwffju- b51mps l*(5bkgtally to the right (+x direction) with a speed of 285 m/s strikes a sandbag and penetrates a distance of 53.68 cm1su-5bl 5k j8mf cfw*r9(bxgp. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is lzg.c s.vz:0xh aunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is conzxgsh z.v c0.:stant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration ofhsuba)0i3u4dgs 9a l0 $2.0 \; m/s^2$ 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 is ,1qf.sd 9r8 z;lovf5x jb;2sr+7 bdqoalsx+cits average accelerationr5ffcjqb 2s9z8;. s 1 ox+7xqldos;rva ld,b+ ?

  An object starts from rest and underg :)dou 1zj;jlnoes uniform acceleration. During the first secon:)nj; dulozj1d it travels 2.9 m. How far will it travel during the third second?

  An object is moving in a straight line with constant ac4dw6wk wbl )r3celeration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fw lwk d6w)4rb3ar does it move during this time?

  A car starts from rest and accelerates uni7r -vmc2uwo6 ecos1 q*formly 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 decelerateb/t2 lybcwp:k ;m6x oh2wo7)w 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 lif lbt8loal -s/-g) w-fght turns green, a car that has been waiting at the intersel -ofb/-)8sg lf- atlwction starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s on the surface of pl3ak*d2fl lzz5r 8gj: .bqxt0x anet X where the ajrb fg0a2k*8:dzl t3lqz.xx5cceleration 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 of 12 m/s on the surface of planet Xsmhi1 *m5ls xix-c+k; where the acceleration due xm 5-*c ilss m1ik;+xhto 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 + ryd-apqe*n(on the surface of planet X where the acceleration due tr( d*yenp-q a+o 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 upwaqun8 rg6yj;3 , razyb7rd with a speed of 14 m/s on the surface of planet X whegn ;b6zjrqya38y,u7r 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.h 0.+c5epm syy10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expe 0hc eymp+.y5sct the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Whatr + :):xp+*rgt5y+qoge zhrzi v nvv/g0/)mjy is its velocity after 3.00 s?*zvi0m:zg+x/)yq+nv/5o v g:yrregj p h+t r)

  A bullet shot straight up returns to its starting point in 12 s. dl a;3nsoatl1( n*8v,hrk n 5aWhat is the initial spee *t,ad8lv aah5sn o;k 3nn1(rld of the bullet?

  A ball is thrown straight up with a speed of 36.q9vwja, jwf ;*0 m/s. How long does it take to retuf v w;,9wj*qjarn to its starting point?

  A ball is thrown downward from the top of a building with an initiaqj(+ aff,k)hpsg+4 oul speed of 28 m/s. It strikes the ground after 5.5 s. How high i4 sf+,q)pkjfg+o(uah s the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill i5, u)r*gv msl65hkq(irov9rn+ w3 yz in numerical value ins*+k3gov 5h6lqyr w5 r)v 9(i,rimzun the 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 d 7;rtct//15svpwp2vs+ u2x d+fpkng the air with a speed of 32.1 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t =rury58,.bu; n hf f )nh,nmvx* 1.0 s?

  In Fig. below, what is the vho, 97kx0slruelocity at t = 2.5 s?

  In Fig. below, what is the velocity ag8e:7jkte/ lmt t = 4.0 s?

  In Fig. below, what is the velocity at t = ahen y z u9.0nr/k,;pp3x ;jhx5.5 s?

  In Fig. below, what is hde* yel8l 47cthe average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6nsf c1wos(s7m8q b-c1.0 s?

  In Fig. below, what is the acceleration at 1.0 yo3kd,d3 0; *7cs;byzi fzxsfs?

  In Fig. below, what is the acceleratqb9:/; x;ekpsajk:d 2jur 5-an0gp ktion at 3.0 s?

  In Fig. below, what is the average acceleratio8/-ts7-o h2sjot z.o lvpg1 fnn from 0 to 5.0 s?

  In Fig. below, what is the average accc hdy 4(erz+ln1q u;//ywcpqgvk6.z8 eleration from 0 to 8.0 s?

  In Fig. below, what is the displacw) cjn-hg0q,fement from 0 to 8.0 s?

Does a car speedometer measure speed, veeymkp3gf x-9a /2h 5ps2 pmsn2locity? {speed|velocity}

  An object can have a varying speed if itsms t586gkhd:n4 o4y+wvuz5 lf velocity is constant.

  The velocity of an objecz ztgpg)4 sc6a1zz1 b(mqv92ut can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must h2cz : cvp em25jb7vlat+th9k(2 jgzd2ave a greater a jh:2c79evtczpb2+avk dj z (5tgm2l 2cceleration.

  Two cars emerge side by side from a tunnel. Car A is travext +np0co3 xe)ling 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 sp,p r (2-g;2p6mdo g y-wkgdyxleed as its acceleration decreases.

  A baseball player hits a foul ball straia/h6ta 3-moqhght up into the air. It leaves the bat with a speet-ahaq3 o6/ mhd 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 happening to its acceleration, how (-jpzpd uwc9/ dc-(/wjp zup 9does it change if air friction is ignored?

  As a freely falling object speeds ;x:ko +drlar:up, what is happening to its acceleration, how does it change if air friction CAN NOT be igno::k+rrol; a dxred?

  An object that is thrown vertically upward will return to its original position +d d(h ejwk/btn:3i1twith the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will thisi(k+/n1 tt3 h:djwdeb result be altered?

  An object can have zero velocity and nonzero au fumehts- m7/2pc34zcceleration at the same time.

  An object can have nonzero velocity and zero acceleration at theh 1zg 87mkaeacs)q)0x :b v6li same time.

  An elevator moving from the second floor to the d4ovzg9.tjxbf2j6q+/,pvf 8yy cm / h fifth floor making no stops along the wq8hjo. xfyp v9t vf2dz y,+g6/jb/m4 cay has zero acceleration all the time.

  A rolling ball moves from pc2,x/f4kc,v ;v4.mwd8 d e(pizq c vp$x_1=2.8 \mathrm{~cm}$ to $x_2=-5.3 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. 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 $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundwv v qnq(m37js 2ii*4kre22vl a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters awaynlxnj8bhyl)7 *s7 .k k from its trainer in a straight line, moving 104 m away in 11.3 s. It then turns abru hxlj7ln*nk.sk b7)8y ptly 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 frdga1nb on7y *yt3wxs;;y s:n ;om $12 \; m/s$ to $23 \; m/s$ in 5.2 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 frofz4,nflbuo1of2:ea, a8: iubz 0c n 1sm $18 \; m/s$ 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 speed of n(s 5jvy1 nn+x$32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst3++s oqb zx qaleks2v 8(/fmv8 out of the blocks to essentially top speed aboul3 o xfk/z8e(8mab ssqq+v 2v+t $10.8 \; m/s$ in the first 13.6 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 uniformly from a sk.gm bml)ti61w9wz+t peed of $17 \; m/s$ to rest in 4.80 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a c7 o,hm)d3v*brlh yfb7ar leaves skid marks 92 m long on the highway. Assuming a deceleration of r7l3)hbh fmvy bo,d7*$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g,w,fgops 23ov 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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. After exactl;gsbbgym,l e8u*x )0l/b ,v byy 27.0 min, there are still 1100 m t lyevgb)bb*xsg /y08,mu;,l bo go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$