Suppose that an object travels fro1b u-gw lbe sim25+hw0y mf6c/ wjp,f:m one point in space to another. Make a comparison betwcm+6 hw5m js20w1ubfw- giy /,elpb :feen the displacement and the distance traveled.

  When is the average velok*;xaci2 uo n5v a5lr /m11ewocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that ti 96hhzitg4e *h2cae; heir car can go "from zero to sixty in 8 s". This is a description ofc4a*ih 2g;i9ze6hte h

  An object moving in tcfqf mf:0cg cds- 7dy*hj*f:-bs w;n)he +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car trygwo2n,r 4 +kfaveling to the East (+x direction) begins to slow down as it approaches a traffic lighgy4 2fno,k w+rt. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directig(q 6d;xour. mm7sb z.on) begins to slow down as it approaches a traffic light. Make a statement ur.zm oqm7.g bsx( ;d6concerning its acceleration.

  Suppose that an object is mo )mj e10a amxg z6l)h(ump9gh1ving with a constant velocity. Make a statement concerning its acceleratugmajh61xa0)ezgl91(m)pm hion.

  If the velocity of an object is zero,.b +m3t ifh 9vjrmv*p5 does it mean that the acceleration is zero? Support93+ hbvtm * virpmjf.5 your answer with an example.

  Can an object's velocity changu-0cb+ edcp(m f(qc1 ge direction when its acceleration is constant? Support your answer with an examu1+m-( qfecp(b0 dgccple.

  Suppose that an object is moving with constant acceleration. Make a yh9ucrdq+72y7tqlwp++7cs ge2yhc8 statement concerniryl82ec yqcy79 72qd+ sw +gh7ht+ ucpng its motion with respect to time.

  Can an object have incra1dad4a,ww y 3easing speed while its acceleration is decreasing? Support your yad3ad aw1w4 ,answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.dga +2k bd4zcn uqwf(iax9-;+ Make a statement concerning its accelerqg(n dx 9uw4z+d-;ack fa+i 2bation.

  Under what condition is average velocity equal to the aver .9z8veo8xpcz d.qr ; rjdff:7 1rj+dnage of the object's initial and finav.9xzd8+d nf :;87orejrc pfrqz.1jdl velocity?

  Objects A and B both start atc db/ym :z;;id rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Wha: b;y;/mddczit is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both aclh. ; h;kqcp( gq; od)v:hg9yucelerate at the same rate. However, object A a;ylo.(pv; )hk9gh:cuq d;q h gccelerates 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 and falls in th zpdaw8/z 1u5gem )s9qe absence of friction, which of the following is true concernin)5m81/9zgu peqadw zsg its motion?

  When an object is released fr or32/f w x1hbm73spu-w7voqzom rest and falls in the absence of friction, which of the following is true concerning its motion1 xwq rf/pv2o7b3wmzou 37sh-?

  Suppose a ball is thrown straight up. Make a statement about the velocit)j7i+srvtwpr tz8 7-llx:u1 iy and the acceleration when the ball reaches the highes jrz7uw l7 ):il-ir+txst v18pt point.

  Suppose a ball is thrown straight up. What is its acceleration jus- ; sl4hmvenb3t before it real4;h-snm ev3b ches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to,b7m + ie)oc*pfnzo;z its initial height. Make a statement about the direction of the velocity and acceleration as the ball i7peoob;)ic*zm z ,+f ns going up.

  A ball is thrown straight up, reaches a maximumwkgb*cg 3 - zdcg8.7vo height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming-c8bdvgk3z. wg*7 o cg down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a 86h 6n*ks+nq 2lqm gakstatement concerning*s8 mlkqq+hkga 66n 2n its acceleration.

  Suppose a skydiver jumps from a high-f5wx0x( oze2 u7, lcn(cu ppw*jlying plane. What is her acceleration when she she repz( l e0 up,x*75(cj xo2wwnucaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball // e f0fk6kry*+ggz jlis 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 k g+j6 yzkg*/lrf0/fe times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, balhvnso5y5.+ uy4*srfex j yo r++po*c.l.p9rnl B is droppedpy *.4e+9f.u5 rcpyrnv xo.jlny h+rs5*oo+s from the same building. As time progresses, the distance between them

  Ball A is dropped from the topaf xs593 x hu0rnddn.) of a building. One second later, ball B is dropped from the same building. As time a3xrd5 fhn )xd 90u.nsprogresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. g:l 0 bsi/ pvwiyi04j6 One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they sp y w:i/ 4viig0j6lb0hit the street?

  A brick is dropped from the top of a building. A second brick is thrown x.c/ /s,bsdin straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricb/s. /s,cidnx ks.

  An object is moving with consta5nd 8pe34hl0rvnqhl-nt non-zero velocity in the +x axis. The position versus time graph of this objep-nl3 8r54hed l v0qnhct is

  An object is moving with constant non-zero acceleration in the +x axis. 5*mwmjtr6bx 0myi nq1f2ut 3di qdno-2k-8+v The position versus time graph of this object 2- duf* 0d53jov1qqy8+xwki-6rt mnt m nmi 2bis

  An object is moving with constant non-zero velocity in tnxox8+ux qx6-he +x axis. The velocity versus time graph oun oqx- 8xx+x6f this object is

  An object is moving with constant non-zero acceleration in the +x axis. ztex v f;chj-)w24 t44g(lcj(rhe;mdThe velocity versusrtgcd)wjx4- j;fe4;h 4 lmczv t(eh (2 time graph of this object is

  The slope of a position versusl 2yd,myon c.a5q.+rj4ql(dk time graph gives

  The slope of a velocity ve q9ainb.h(dt*9p25tcidl sa1m -3kz orsus time graph gives

  The area under a curve in an acceh (se /r*i;v.zbf*kfa,,jrg h leration versus time graph gives

  The area under a curve in a velocity versus time grapkhz;tt+ ,umdv v74-4i wdfc.wh gives

  If the position versus time graph of an object is a horizontal line, the object je;qr-ww,.o 34okldyf p o2y8 ve7q3dr.,7 4d-o;2p 8qo3o yfwek ywdel3vqjis

  If the position versus timex,b0mypsm3 m ) graph of an object is a vertical line, the object is)0s b,mpmxmy3

  If the velocity versus time h-pyz+slj: :r7 mu0clgraph of an object is a horizontal line, the object is0js lr:7lhm z p:uc-+y

  If the velocity versus time graph o*p dnyqcxv+)q0 e:nbc.-xhq .f an object is a straight line making an angle of 3q yh+).:0b*c xn.xq-e vqdnpc 0 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m southj3ea5 9)x patn. Find both the distance traveled and the magnitude of the d n3peja5ta)9x isplacement vector.

  A boat can move at 30 km/h in still water. How long w d7 ilfv+cn2d9ill it take to move 12 km upst nvdf+9l2 dic7ream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 ;.jnwu;ue. 1 h*wwn ev1t5qwmoiz9 -q m)

  What must be your average speed in order to travel 350 km in 5.15 iz kr.72vhi0hkp 6 0aj; 3eeskyv+):m:ayro ch?

  A runner ran the marathon (approximately 42.0iuxll +yp6(.v km) in 2 hours and 57 min. What is the a( l .v+luyxpi6verage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel(hn,f8 ;lxw ei 400 km?

  A ly (light year) is the distance that light travels in one .w(k:fuw9hzdu 43lu jyzk 9 -zyear. The speed of light-wd. zky4 kj 3(zuh 9u9lwz:uf 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 straight road and you look to tht18kt ks4yp:mrs7s3 r u(p ez*e side for 4.0 s, how far do you travel dut pr8sz*t1ksr(m:uky 43s7 epring this inattentive period?

  If you run a complete loop around an ou;u+eo2oqy8n7fj, xs z tdoor track (400 m), in 100 s, your average veloci2nq8 xuz,e+ o jsf;7oyty is

  A polar bear starts at the North Pole. It travels 1.0 km sog. hxq27* fvas5dsju 0n4+pnfuth, then 1.0 km east, then 1.0 km north, then 1.0 km west ton agpj5 q+dfs724v*u x.0fhns return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at thehp ;4u g:6ib r2epkpk2y jv2yo5l6);d0czj pu North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 ;ckgduopj5y4 j;z lki2e0 2h rb6:6pvy )up2p 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 f:pvzwz9 -5twy rom school at 55 mi/h for 110 miles. It then starts to sn -ytw w5pzzv:9ow 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 km at 100 ai* wcz:6gh f*2v k-akue6v( ykm/h. What is the average speed of the motorist for thisu-6 : kch v**a2ifg6wvyek (za trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is h904j7:wi ,cwjuti*pl y-dy7 yc nkrt /er average speed for thej0prc/9yt- k:*w47i wycnuijyl7t, d trip?

  An airplane travels at 300 mi/h south for 2.00 h and then ati3c j,jfa9 n+zke,zx9fe k):j 250 mi/h north for 750 miles. Whajik+na e39z xk:9ejc zf ,jf),t is the average speed for the trip?

  In a 400-m relay race thq z+)hp20m4nng ffrl .e anchorman (the person who runs the last 100 m) for team A can rurq 0mpnlh 4 f)gf+2n.zn 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 race?

  A car decelerates uniformly and comes to a stop aftee4dauqqlr3*6db n (+z r 12 s. The car's average velocity during decele e3(a drbduq6+*ln4zq ration was 41 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed fr7jy9yb zx0a 7vom 100 m/s to 160 m/s, at the average rate of b90y7a jxv zy7$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at4gyshji (6bos/*p(k t 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 accelerates at ;t;v6qfob: wu -+rgh /ognl6x$4.0 \; m/s^2$ 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 uijkei26 u-+p +nd; nx r9sfio64a(sfep with a constant acceleratio626rn-s+ aixop ;n k(fii+d 9 4eujsfen 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 o vmg +8h 6yiakqo)wk6)f 3.6 m/s experiences a constant acceleration o 6q+o viw)k k8m)h6agyf $3.2 \; m/s^2$. What is the cart's displacement during the first 5.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spes ezfa; fa:k)mwpevn6 3nvh +fn3:g(,ed of 325 m/s strikes a sandbag and penetrates a distance of 69.59 cm. What is 36,v ns(3 : ffvn:;ke hfnepgw)+aazm the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrig m.7 z2gl.zsper. It reaches a speed of 42 m/s at the end of the catapult, and this re.sgzzg.m7l 2pquires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleratbki+ :uqrw9 p.mwhme5(9w1 npion 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/sip4 tija90*o ( qgq1tsbrbc +: in a distance of 200 m. What is its average accel s tairb9 iotq*:g1 pj+(cbq04eration?

  An object starts from rest and undergoes uni (osw)/g9qq0ilfv 6niform acceleration. During the first s( gqfw0s/ilqi6v o9)necond it travels 5.5 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initiall fjjwr,9mh5x8 y it is traveling at 16 m/s.fjj,w5 9r xhm8 Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and w/pup-6g3 xz6-i t(h*1aomi;bdr rsd accelerates 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 abon xf5s5kl9/x cut $5.0 \; m/s^2$ 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 . (jmfcyrg 48hu(s yx)has been waiting at the intersection starts ahead with a ch.sy(y8cm j u(gr )fx4onstant 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 plant/ b,n m*khq28zsdd.v et X where the accelerat2bd*n sd zqv/ ,khm.8tion 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 surface5k *9vceptd3qwt:, bd of planet X where the acceleration due to cb9d ewkt*v,t p53:qdgravity 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 thf )kc7fjwyp.ow u w6v8c 9jt;:e surface of planet X where the acceleration due to gravity is u9 p:6. ffc;o)7cj8wyw t wvkj$2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a c/wfu qh umbv4wy/4.4 speed of 14 m/s on the surface of planet X where the acceleration due uf4yb q/vw /whmcu4.4 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.xt5 -.pdiwz ik4p .a4q If your friend holds a ruler between your fingers and releziwq4p.5 .daip- 4t xkases 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 veloc1m kux1:v hru:ity after 3.uh m::11 xrukv00 s?

  A bullet shot straight up 8umz-s lh /eucp )jpw1dq*z*5 returns to its starting point in 16 s. What is the initial speed of the bulleec*sd 1 -qmu)z/zlw*p 5h 8jput?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it takaqt ; 8cw53hkje to return to its 3aw t;hk5cj8 qstarting point?

  A ball is thrown downwar32w5p/cgncrxz xmubnzcx5w/d, 3 *g+d from the top of a building with an initial speed of 27 m/s. It strikes the ground after 2* md 3xnz5xnpucr ,cgc3/x5g+w/zbw1.4 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nup j rmwf+rhm2* z,+1ctmerical value in the bla,m mrrpfzc1 *t +j+hw2nks)
(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 straightm,ecvcd:5j oia )).lh up into the air with a speed of 26.6 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 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 = 1.0 s?q6ksq :. rdf7y

  In Fig. below, what is the velocity at t = 2.5* op7 soxqif() s?

  In Fig. below, what is the velocity at t = 4.01 atsyf5 j 6ky-kef4,x s?

  In Fig. below, what is the velocity at t = 5.5 s?(7 io4u q* 3ypifpx+db

  In Fig. below, what is the average velocity hfhg * i1 dz;icq,r8m0from 0 to 4.0 s?

  In Fig. below, what is9bn+rnn 5s 66yjc4tr1 iqxkp5 )hap.,ap ;ead the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration dyhc 282t)peoat 1.0 s?

  In Fig. below, what is the accelerat,h30fiourm u 3hy;shkal)1l+ion at 3.0 s?

  In Fig. below, what is the average acceleration b5bo,k4p8r3z xt12yv z9n p+eu5 lp3+ucpz dyfrom 0 to 5.0 s?

  In Fig. below, what is the average a :dgfxqbfb/( 5cceleration from 0 to 8.0 s?

  In Fig. below, what is the 8o y7,k5r ;sknstk c9q5qefqj9 al1/ndisplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velov ag0njab)3 o 1w1.rglcity? {speed|velocity}

  An object can have a varying speed if its vec gt 205nzeghp2tsdkp7 p 2i1+)f can7locity is constant.

  The velocity of an object can be negative when its acceleration is posl -ygidycbx g;6a:k r6e.0 n-ritive.

  If one object has a greater speed than a second object, the first mus 1t6 ggd eq2:hn:v9rx4sqzka0t have a greater acceleratioxeqg:nh0 zd1t6k2s9vr :gq4an.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speiio-w,,w/f o 2yzz-xbed 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 p5 aav 7 1+sd;kjcg4zbas its acceleration decreases.

  A baseball player hits a foul ball fssl3bjp,c 01 straight up into the air. It leaves the bat with a splp0jc, b sfs31eed 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 ) elf(o, gwt+x0yxzx,cf 5b6f -d9 pithappening to its acceleration, howx5fi e 6dgtf ,xc(z9+ot-p,yf 0lwxb) does it change if air friction is ignored?

  As a freely falling object speeds up, what is uv71 , k- 51/th:xxz10hmz i nduyylqbhappening to its acceleration, how does it change if air fri5z,ztu 71i0xbm q1/h-1yy:k n vdl uhxction CAN NOT be ignored?

  An object that is thrown vertically upward will return to is,n9t/jo .*c6lvke fkts original position with6* vet,lkfon.s kj/9c the 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 veloc5ht k:ch5vix(g a8m )kity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration atfhsep9 (b/ *30yimvdi(7alp jr) :abn the same time.

  An elevator moving from the second floor to the fifth floor maktoitt)) 85/ ccni0chcing no stops along the way has zero acceleration all the tio 0hic8t i )tc/nc)t5cme.

  A rolling ball moves from 04y51 )ejgi lgrrbk*ilnat15 $x_1=3.0 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around b3pe0cg ;eae0cdw/gsf e7uh v2sp 4e19+3cpn a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.6 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 96 xo fiikm k8 k2uht:3nu)c/0d; m away in 8.5 s. It then turns abrupt;xi:8t0ikc2)d hmuo kk /un3fly and gallops halfway back in 4.8 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 k:9kj yiqa9aoy0 cy,,7uo1hpm $13 \; m/s$ to $25 \; m/s$ 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 fromdik7 vocdl) k *4-ls9c $21 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of hj96lyp dhakesxn799vag v-8 :h e-4j$32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abon2 ,2t83uq q- f+y)h*uptxhnw :hgljuuth2:,hq3 n tujugx+wu-8 ft2) nh*lqyp $10.2 \; m/s$ in the first 11.6 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 froa9tt5 14gwk ggm a speed of $18 \; m/s$ to rest in 4.34 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 b pw+cw7ui9h8 * e.ujcm long on the highway. Assuming a wep c. 7iucuhbw9j* 8+deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trym1ddn7a rk7kgk8n l ;1.c5 +vc tw3fquck 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 complczyheh2mwt0k fui9km (7 h7;6 ete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1eh279kh 7mfti ukc zym0;h6(w100 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?    $s$