Suppose that an object travels from one point in space to . lcvq;4 xd9.xwc/aylanother. Make a comparison between theccxl..y9x ;dv/wa 4lq displacement and the distance traveled.

  When is the average velocity of an object equal to d6fo-v sy8l 6u6ltwkr5 p)(if the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in*lssxbvw7g2-o)r6vlcpbm r0;87 vn v 8 s". This is a descriptionv;8bnbl pvw20ssr7)omv6-rv lgx *c 7 of

  An object moving in the +x axis experiences an acceleratyopi( df u7lx6* g)zt/ion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directionraeau sdzm/s+ 2- m 1vb(9yj,e) begins to slow down as it approae1-d(rm+ess/ uja ,a by92vzm ches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x d0ef l x d*1sr8j2fiu-mirection) begins to slow down as it approaches a traffic liulid 8mje0xf1srf2 -*ght. Make a statement concerning its acceleration.

  Suppose that an object ix3ibp(dyi y eu6l64k2 s moving with a constant velocity. Make a statement concerning its accele6(i ey l26xp4dui3bkyration.

  If the velocity of an object is zero, does it mean that ty72ftjnj0li n f*00dsz,t8ed he acceleration is zero? Sunsefj i 78f0t20*j nt,ld0d zypport your answer with an example.

  Can an object's velocity change direction when its acceleratioyt;dez0 , zao2fmsfz(:t0 nl* qw1ch ;n is constant? Support your answer wic:,;1owz; fy et h*dnz tmzf0q2l(0asth an example.

  Suppose that an object is moving with constant acceleration.r)yel+ hl, xgpbyk6+ *bwylr6 da46 3i Make a statement concerni+yri,yy6ra d *646xb) b khg3+lwplleng its motion with respect to time.

  Can an object have incrf4u m)ktn sfv7oos+ gwd1 w0;r ff9j98easing speed while its acceleration is decreasing? Support your answew8ovo4 g0u9 fdfm1ssf)7 n9kf;rj t+w r with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice:mom +b q m4 nk7.i6c:.fptzge. Make a stat cm g:+76f: oqeibnkmpt zm.4.ement concerning its acceleration.

  Under what condition is average velocity equal to the a zjkna+e e46shr5i;ij gt1g 1.verage of the object's initiaa41is;1ik.+6r ggje 5thenzj l and final velocity?

  Objects A and B both start at rest0am8uy sc:cgrtn -k/i.esno1p99q m . . They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?i kc1sqsugp.99em0a m/nc:-o n8.tr y

  Objects A and B both start f6vcbys .(. )mon*ricf rom 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 object A compared to that c(fv i.cb*yno)6 mrs.of object B?

  When an object is released f tcy7ib; sa-b1rom rest and falls in the absence of friction, which of the following is true cy 7;-bctbs ai1oncerning its motion?

  When an object is released fromox2)n b-xxc 8z rest and falls in the absence of friction, which of the following is true x-cn8 x)2xzob concerning its motion?

  Suppose a ball is thrown straight up. Make a staq9nrrnx . cbk , 1ix.ujq4q,6rtement about the velocity and the accel9q u1nk qxcir,qrrnx. .jb64,eration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration joc7yfx5+ /zmb0qes6w ust before it reaches xfw 0 qm/6o5+cezby7sits highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, thw.bj2mu3f sa )en falls to its initial height. Make a statement about the direct am fwjb32)su.ion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to ig na)j l4):nammeel,+ts initial height,g+n ea)4la)mmj len:. Make 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. Mak,coy,k j6g bx)e a statement concerning it6 jb),cyxko ,gs acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratiudb k0 hyi6be6d/*c k:on when she she reaches te6*u:0dyke/k6b ib hd crminal velocity?

  A ball is thrown vertically upward with a speed v. An identica d4j b/ 1uom(.aqojq5al second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the seq ju1a(.j omad5/4boqcond 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 later, bh8xw8 m vze9swh;2c u+all B is dropped from the same building. As time progresses, the distance between;ms9eh+ 8 2 uwhv8zcxw them

  Ball A is dropped from the top of a building. e /0 igkiwprv+ vg,j29One second later, ball B is dropped from the same building. As time progv 2 k,vpi +/ge90wjgirresses, the difference in their speeds

  Two objects are thrown from til4 b37avk7pbd acww1 4g :ys3he top of a tall building. One is thrown up, and the other ilv bbdi3:k7c gpawws 44a 17y3s thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thos0xo 8j+ ik)g (:riwd lrc(x6rown straight down from the same building. They are released at the same time. Neglect air resistance. w : l(+ crod68i(r sxjxi)0ogkCompare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axoma cc+. nm ,tedts.k,rqr:cp97 2mo /is. The position versus time graph of this object is. +c, rn9m:r s7cc.qktooaept2 /m md,

  An object is moving with cxj /favab.1(t :x,dgw ,(dhlionstant non-zero acceleration in the +x axis. The position versus time graph of this objec,d,( vaf.d/ :jlbtag1 xw(ih xt is

  An object is moving with constant non-zero velocity in the +x axis. The vel, ,/avyewnlwemfro 9 23svf/)ocity versus time graph of this obve,/fl ew2o )yafwvsn,93 r/m ject is

  An object is moving with constant non-zero acceleration in the +x axis. o ip0iq8-m -)4rsxak eThe velocity versus timep0qk4-ao8) xirm e- is graph of this object is

  The slope of a position versus timeqd j;b so(,l s)o(bq7p5shtm8 graph gives

  The slope of a velocity versus tim1lk1h.oycss(jt9 t tiw+8os) e graph gives

  The area under a curve in an acceleration versus time gra14 g vnd:,.smk 9zdfzmph gives

  The area under a curve in a bf- i5k5:qz7xmbyj 6jvelocity versus time graph gives

  If the position versus l (h+;dicq7h)f s;x ndtime graph of an object is a horizontal line, the object i( 7hnxc+)ishddl ;f;qs

  If the position versus/:c7-/9 zo mdwjwsigy time graph of an object is a vertical line, the object isyw/om:i7 gz9j -swdc/

  If the velocity versus time graph of an object is a horizontal line, the objectlrj lnyg (ze3ma.h*-a) wu5h5 i )ju(3y hhlmgl 5r5*nawa-e z.s

  If the velocity versus time graph of an object is a straight line m0ry5-8qdiq i)xe+ceev6u1; f dgps3hx43vei aking an angle of 30 degrees with the time axiueigxd1e6 f3-rq8se5pi; e yv40id+qxchv)3 s, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both n,u6 m2kaft*zar/sn9 the distance traveled and the magnitude of the ra/t fsn9kamn,uz *62displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 1bik84)ri / kr;gsn: wr2 km ursk/b;gwn8 )rk4: ii rpstream in a river flowing 6.0 km/h?

  55 mi/h is how many kl-y 0mb71yu p+-fj 7wldy o,hm/s? (1 mi = 1609 m)

  What must be your average speed in order to travel8 bhpg*ivc(h vuk5 /rhaoq-+6 350 km in 5.15 h?

  A runner ran the marmh)8bhj nbej9c t78j( athon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runnerje(nj 7 j)mt898bh chb in m/s?

  A car travels 90 km/ht xk01e,p*ltre )2/bj(niqdac ew :8l. How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travelsj-u58m nazi8rxn ; bwx+ny*v 5 in one year. The speed of lig n v5wb58 inz yjmxu-*+r8n;axht 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/o c r0sn2p8.xja9 nlrah3p)l 5h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive peri0lrja rn. hpx28n5lca)s93 pood?

  If you run a complete loop around an outdoor track (400 m),7ei)f 0vxi)p ay,q xp* in 100 s, your average velocity iapx v7 xi0)y)f epi,*qs

  A polar bear starts at the North Pole. It travels *1jh4f4/j ri az pylu01.0 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 beayz4jr u fjl14hpi*/0 ar's average speed?

  A polar bear starts at kf-0sca u7+wkfcn,5j5x j e8evox 5/vthe North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wenfkf-v u5c8v 57 keax x 05es/+,jjcowst 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 school a:8ynh l6iew2 4y( om ind0x-swt 55 mi/h for 110 miles. It then starts to snow and youe6n4x0m :wyldyw2so(hi i-n8 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 q *spiaqalh i+, 3h6*nx4nj,t km/h and 160 km at 100 km/h. What is the average speed of the motorist for this tri t ij na+a*6ipn43, lxq,qshh*p?

  A motorist travels for 3.0 h at 80 km/h and 2.0clxj(ytj e7q; d6ku/- lu e:f5mh22f7ztg;jh h at 100 km/h. What is her average speed for the triptl e6j z 2y fhfq /tl(:j;ujcg7;eu k-d27h5mx?

  An airplane travels at 300 mi/h south for 2.00 h and ty)vajo4j2yov9 cg9 v-hen at 250 mi/h north for 750 miles. What is the average speed for t-vyv9a j co2y)govj9 4he trip?

  In a 400-m relay race the anchorman (6;e17po*k ddh/uavkcd , jt0 ethe 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 final leg of the race, in order that the team A runner not lose the racepj0kcd v;/6 tud7k1o, ed hea*?

  A car decelerates uniformly and comes to a stop after 8 s. The car's avezka 4mq-cl:o1 i;i- merage velocity during deceleration was 33 km/h. What was th:lkae4;-zmomi c1 -q ie car's deceleration while slowing down?

  An airplane increases its speed fr bmn45 u;;q0q*tupek .iyx)rfom 100 m/s to 160 m/s, at the average rate of tqrx.; mp 0bf;5qui y4u ke*n)$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates a-cszqtpo rfu)d1rb 8 zx855(mt 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 re9c e46h2 st6 8jjhmftpst 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 10 s. It then speeds up witrs/su s6,v-lv6oq d9 hh a constant acceleration u6,ds9o/ vl6ssrvq -hof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.9 m/s experiences a constant accelt gf .n*d8qg,xeration of f d q*n.g,tg8x$3.2 \; m/s^2$. What is the cart's displacement during the first 4.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 343 m/ssjy5z f h9li(. strikisyhlfj5.z 9(es a sandbag and penetrates a distance of 34.25 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched frznf3ty0tp* 4 rom 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 acceleratinz rt430yt*f pon is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration oi2/et4yhwog*g s;3 d-i4 sabqf $2.0 \; m/s^2$ 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 its average r ne5vouhz577 ace ur7zon5vh5 7celeration?

  An object starts from rest and undergoes uniform acceleratyews,;xlq; -o ion. During the first second it travels 6.3 m. How far will ie-s;l;x q,yo wt travel during the third second?

  An object is moving in a straight line with constant acceleratiu6xb uf-q5c-p on. Initially it is traveling at 16 m/s. Th6x-q pf5 uc-ubree seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and ac w4kt6j/emebw*5tlar+ nk0;kcelerates 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 tsa v6crnu6+utx ,v/0y) k7vnon a dry 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 car that has been waitingw(jgfeu o5 1 jr) 1kmgm/r8,b)r bfxhwqk )7u- at the intersection starts ahead with a constant accelerati u (gjgm,/jkwme rqxf1fo 1ur r)kb8w5-)h)b 7on 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 wit 5yf luznsw0vd+*f71ah a speed of 12 m/s on the surface of planet X where the acceleration due to gravitywf5y0zl nva s*7 u1d+f is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwardi1 -kbcknm2jje*++/oaz tgh ( with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity in+ acz(em/2 +oi ktj-gh1b jk*s $1.5 \; m/s^2$. 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 planet8p5chrq0h; s m X where the acceleration due to gravity rq0h c5;smph8is $2.5 \; m/s^2$. 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 surface7pccf1(dvl.bbtqj81 l *8won of planet X where the acceleratifdn b . 7tj8c(lwp 1vb8loq1*con 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 fre vxb7/i+53xpv hz pdr1i,fu5 iend holds a ruler x,bvi3z ux1p5 hpfde5/r7 +vibetween 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 velocity o8pfqa(e sy7s8f 19.6 m/s. What is its velocity after 3.00 8q y8esa(7pfss?

  A bullet shot straight up returns t0,abj*pj9n1gr* k2p ewe2je to its starting point in 7 s. What is the initialk a920n1 g2jbt*ee jpj,rw *ep speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take 3q3akocfj7vj;fq+ .d jvche66l4w 5 dto retuw3 45.eaj d f+vc3c;oj7vfkql djh66qrn to its starting point?

  A ball is thrown downward from the top ofrzqtc4) g d- pe.r3 jat*yac)( a building with an initial speed of 15 m/s. It strikes the groundr3-q. )tc (yzt epgj)4a*crad after 2.3 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (onl.g w:ll 4voz.ly fill in numerical value in the blanks)l .:vzo.4lgl w
(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 35.3u.sgg r3)is+jqkdw5 ((ht f(osji2md7+ e .j k 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what ihbr( k gh8oim- )in1ozoriygf /9c (37s the velocity at t = 1.0 s?

  In Fig. below, what is the ve6+y9c-:gcclousd ar (locity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 44d1vg19tez3hv+p uya .0 s?

  In Fig. below, what is the velocity at t = 5.5 s?b2/f(5 fam9kxz hrjg3

  In Fig. below, what is the average velocitqh6 1k 1.pj/amf 2btoxy from 0 to 4.0 s?

  In Fig. below, what is the average 3/pl f f 2byb*b/luj9jvelocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a7b loj dge.7af0ytw7 8t 1.0 s?

  In Fig. below, what is the acceleratiofpnw(p1 i,xcm4 r.6 xin at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 zc,my/ n)cl (ps?

  In Fig. below, what is the ave7m ap/2l k*6xbxfsaikfn;v70z )o c t3rage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemen3ct kv( vr6/j4 a9skjnt from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speeddcn;e iv e)z;ee jies: j11((k7iqve.|velocity}

  An object can have a varying speed if its vell l;g7idry94 66gp1tmhh 0yuqp9lui*ocity is constant.

  The velocity of an object p*g6u - ,:ca6poqemp rcan be negative when its acceleration is positive.

  If one object has a greater speed than a 2 cxi1 :1gf*wgvba) evd)9pb tsecond object, the first must have a great1 teg xc*d91v )pfbb: aigwv)2er acceleration.

  Two cars emerge side by side from aw ;u lxl-*0vdn:; ovrp 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 decreases.hmh 4qz*p e5z/

  A baseball player hits a foul ball straight up into the f/wm+o t70gvdair. It leaves the bat with a speed of tm+ 7fo0wvg/d$120 \; km/h$. 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..grsbeg6i qe1lwx6tk(y+ 58cts1 me is happening to its acceleration, how doesl.8 +wsx6m gte gr.e (1tyscei156kbq it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, iz k+ytqje* og *;x(6uhow does it change if air friction CAN NOT be ignored?6x+g*qk( ;e*it y jouz

  An object that is thrown vertical d y8s w: :4jlo6wfsxp46cxb9ply upward will return to its original position with the same speed as it haoy6f :b6jwl4cw s 84xp:9pdxs d initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity anwr/iu i*q,q7zz/v bxkrw*a7 5 d nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acce1i gsuk1 9cj /d-z0fgdleration at the same time.

  An elevator moving from the second floor to t hzw c10. ihmh-ms7 6s88ie6wp;hjbqt,yd,dahe fifth floor making no stops alongiqw,t .e6a ;m 7,h8hd0ih -8 mbwd6yshjs1zcp the way has zero acceleration all the time.

  A rolling ball movesn jlgfq:/v 24d 1hdn3s from $x_1=2.5 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. 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 $t_2=4.5 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mde- (yhg+as4a ile ($1 \; mile = 1609 \; m$) track in a total time of 10.7 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 yiq,w* 0.;uo)wfhzay 113 m away in 9.2 s. It then turns abruptly and galloz ow)ia*yh;w ,q yfu0.ps halfway back in 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 fro j*q a*ddr/5-yzh 168fuupt kym $13 \; m/s$ to $23 \; m/s$ in 4.6 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 froztj )( b58g1md/gx)d +eu ppffm $18 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reajvgwdgki4 z;23 b-2fm rv;2 xhch a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top spee;duzc((, bmigs dd af9r(2p y25elu;xd aboutg,lr(2e9b;;5(2 ascmxpzf i udd y d(u $11.2 \; m/s$ in the first 12.2 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 fro ieihz4lp) z7*m a speed of $15 \; m/s$ to rest in 5.30 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 highwa5 h66eswihd-pk;g3 o;q/hxm ay. Assuming a deceleration of g kpe5mso-hdw/q6ah 3i ;;h6 x$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck4g v,qnuym-8v 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 the 10,000-m run in less than 30.1 co1zkrd 07jp0 min. After exactly 27.0 7zrj0 pdkco1 1min, there 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?    $s$