Suppose that an object travels from one point in space to another. Make * :elem, 5dk fz5;s-mnp8 t /cszog2ywa comparison between the d l*;:2p k,dn wyes5t/cmfsemz- g58zoisplacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous b+t6 wghrbs(z1*h *xxf w4x.p xmaz1+ velocity?

  A new car manufacturer advertises that their car canw:jrs0/btk-,vsf oma13y nw7me ( lh/ go "from zero to sixty in 8 s". This is a descm, mv /fylk t:n07 r/3eha-bj 1owsws(ription of

  An object moving in the +x axis experiences an acceleration t ov mr*hk2r84of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow d68*psukwp6on m6b qg0own as it approaches a traffmpk 8op0 s6*wnu6 6bgqic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down as iglu; et)ect*,v,ed5it approac);* ,vg,ei cud5t eelthes a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant veuv6hl6oto 72 jlocity. Make a statement concerning its accel6ht 62olojv7ueration.

  If the velocity of an object is zero, do0ra+ yvf0o0hw- r,cp res it mean that the acceleration is zero? Support your answe 0,+rva ryr0cfo0 pw-hr with an example.

  Can an object's velocity change direction when its acceleration is con v 8,mcllwo)0 akl+f)w;jh4fnstant? Support your answer with an e,awn wk+cjfl8m0h;of) l vl )4xample.

  Suppose that an object is moving with constant acceleration.v gny8/41sf 9tmb h;kz Make a statement concerning its motion with re/vt f;hzm 4 gs8nyb9k1spect to time.

  Can an object have increasing speed while its acceleration is dec1s es/sd0j /70ejyngx reasing? Support your answere ys sj s0dnj7gex0/1/ with an example.

  Suppose a can, after o2od9cffbv +-8-a finfqnfy n+qk+jg b3 . ,a7an initial kick, moves up along a smooth hill of ice. Make a statement concerning its acce f j fb-anfbya-i .+od 27n+k cv+8oqgfqf93n,leration.

  Under what condition is aveza4 ih+ y:biuu7*l+lol52 wpdrage velocity equal to the average of the object's initial and final vp u4*id7 a+ 5l+:lwu2i hbzyloelocity?

  Objects A and B both start at rest. They both accelerate at the same rat6 0wbqnvzg.+p 5z6xb(4z mlvge. However, object A accelerates for twice the time as object B. Whatb64+n mbv5vw l. p0gzz (xgz6q is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both acceleraoxbs ;xd j,m,b z4 d*ws;o*8dwte 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*8 oomsj;4d,wdx z,bsb dx*;w of object B?

  When an object is released from rest crwc0uwx, k hj+g /db9y53o6wand falls in the absence of friction, which of the following is true concernic 05/gwy6 b,3hxw+wk9 rjodcung its motion?

  When an object is released from rest and falls in the absence of frictio0mpq0h2 p9sfted0dm9 unyk -5 n, which of the fol-thfkp5msu0 09m0dqdy 29ep nlowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement aj9 sm,hu6s ;bmc7tc 9ebout the velocity and the acce9u; m6e b sc,tjh7m9scleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What hbv qe5/bf 0y4is its acceleration just before it reaches its hh0f4 vq /yeb5bighest point?

  Suppose a ball is thrown straight up, reaches a m i1zdjx36dc0qaximum height, then falls to its initialj6x3 q0d cdzi1 height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reachesi/ 5+7xwm(j/o4* f mxmv k3qm c8pioqc a maximum height, then falls to its initial height. Make a statement about the direction of t+vf c34o(x 7qm/qcwmj85ko* mixp i m/he velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downw(dg0 kno8 p0mward in the absence of air resistance. Make a statement concerning its acceleratodk08wmpg 0 (nion.

  Suppose a skydiver jumps from a high-flying plane. 45, igaz2hngb What is her acceleration when she she reaches nz2,hg5 4big aterminal velocity?

  A ball is thrown vertically upward with a speed v. An identicaqqx 95 gfw 3b6vw.kw.c.2euhql second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of thvuw53f .gqhb2 .c6q .wq kex9we 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 laq hru0u+u6a igo338brter, ball B is dropped from the same building. As time progresses, the distance betw83 +gquhu6o ar ir03ubeen them

  Ball A is dropped from the top of a building. One second later, ball cb,lf0 ga.0to / sxnojj d0*p5B is dropped from the same building. As time progresses, t*jx 0dl.0 p naobfj5ogt0c/,she difference in their speeds

  Two objects are thrown from the top of a tall buikc 6ji9hpf 9wou,s - 6+2yglvhlding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the stree6c+ vyku ow69hh j2,lg-i9 fspt?

  A brick is dropped from the top of a building. A second bri:9 y;t+oa osagqk1ze 0e w:(ilck is thrown straight down from the same building. They are released at the same time. Neglect air resistanck;iya+1 9w alzo0q:seoe:( g te. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The posjyz o liwm9*6;ition ver;*wj l zom96iysus time graph of this object is

  An object is moving with constant non-zero accelerati,0jg0k33 gefad t erw+on in the +x axis. The position versus time graphj3 e0 df,ra0egg 3w+kt of this object is

  An object is moving with constant non-zero velocity in the +x axisq f1f8v7cztkz on: :f5. The velocity versus tim ftz7:1k 5ofq8 fvc:nze graph of this object is

  An object is moving with constant non-zero acc jngeuczt dcc1:7d,.1eleration in the +x axis. The velocity versus time graph of , du1j1dcgzc :c7te .nthis object is

  The slope of a position versus time graph gi(b*e6( p *qh3bmx exjcves

  The slope of a velocity versus time grap -/ usl;x x-8)xvbimtih gives

  The area under a curve in an accelerationy ep.kb0wq9 94(cjhnn versus time graph gives

  The area under a curve i xa.3ulq5(cwb/c nk-pn.s/1a. ips het, j4kkn a velocity versus time graph gives

  If the position versus time graph of an object is a horiz s+ 0kdmxrb-q:ontal line, the object i0dxs kq rb:-m+s

  If the position versus time graph of an object is a vertical line, the object i:uzw 3fi;+wmya.:kq vz(lm 3psw :;mp3q k(w3aulf z:imy.z v+

  If the velocity versus time graph of an object is a horizontal line, the objec13: quq/,br pmsh zrcvl*i;b 1x8zzg 4t mx cr;s h/lq,g*b8zuq3iv:14 b1zrpz is

  If the velocity versus tih (-734ygs :nih suf4ndjpu1bme graph of an object is a straight line making an angle of 30 degrees with the d: i(u 3n71ph 4ng4 sbyfhsj-utime axis, the object is

  An object moves 15.0 m north and then 11.0 m s3gs:-fv: uwhr,rco. y) df)esn;xb/(g; lkgiouth. Find both the distance traveled and the magnitude of the dibf)gg3ks yh n; d:)wge sox r.( -lic:ur;/fv,splacement vector.

  A boat can move at 30 km/h in still water. Ho02 ,wgijgwt 8*h+p(nlmcqohz -(sls1w long will it take to move 12 km upstream in a river m+w0 stnh oigwgh1sl(z j*8,pqc(l2- flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m(dsm5kc ps 3s*6r,o2h emo+sv )

  What must be your average speed in order to travel 350 km i)yia,:hr9: blxuzf)4qbs b u:n 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min.c.kzxhz -i (2z What is the average speed of the r2.-zkxz zi(hcunner in m/s?

  A car travels 90 km/h. ;rvx*1o+bd5 7tb:qqta a id9b How long does it take for it to travel 400 km?

  A ly (light year) is the distance that a )4sxodxd-y4 light travels in one year. The speed of dsdy xoa) 4x-4light 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 lo dk 7wjtm*;:uvok to the side for 4.0 s, how far do you travel during tu *d;jvm t:kw7his inattentive period?

  If you run a complete loop around an outdoor track (qhix;hgjs * 0ay53w)o400 m), in 100 s, your average velocity qai *3 o)x;05gshhjyw is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1:dkdq;0xhs;bcd* c3a .0 km east, then 1.0 kb;x;c* 0dq3ddcsak :h m north, then 1.0 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 Nortj 7o;p9qnf.b zh 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 starting pointn qbfzo.9p; j7. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h fofwn :3bd6ole96vw833 s ygnp yr 110 miles. It then starts bg:wd3elv6p ys y39f 38on 6wnto snow 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 km/h. What is the a:b3y u6vn.p,dru*h t wverage speed of the motorist for this tr.:3r* ubnup ,wvdt hy6ip?

  A motorist travels for 3.0 h at 80 km/h and 2.0nui;lt/u/ 5 oga2 hd(i h at 100 km/h. What is her average speed forhg /toan ;li(d 5i2u/u the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 2500k*t+z4s4goy* ) d5u (gf:bcp qv9muc osjx6t mi/h north for 750 miles. What is the average speed for the xtt5j *: g49cpz o uodc4qsu+)(vsmyfgb0 6k*trip?

  In a 400-m relay race the anchorman (thi)0lqqr7sl de wr7 m.*0wene9 e 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 covmn r)q*rs7ilwedw0 q07e.le9er 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 after 12 s. The cbl d nfo7:u1k;ar's average velocity during deceleration was 51 km/h. What was the car's deceleratio: du1o7n; lbfkn while slowing down?

  An airplane increases its speed fr uihp(4 ap9ly 5*ue/czom 100 m/s to 160 m/s, at the average rate of lh*e4pzupi(9 5au /yc$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acc8cv m,mqah(rxs789zl 4y favbi 5 q4p3elerates at 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 z9hejzk 8/wz:6gx5gd +ps.gp 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 upbfd(7. 6j kizbuo :l+t with a constant acceleration(z:i6ktjlu+dbfb. 7o 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 4.2 m/s experiences a constant accelerationkhiu/m. tl./len+a f) of /kutheml. ifal.)n /+$3.2 \; m/s^2$. What is the cart's displacement during the first 8.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) wi.8b 8gzuc)y lcbdy8 4mth a speed of 434 m/s strikes a sandbag and penetrates a distance of 55.05 cm. What is the average accelerbl84y8gz um b.c)cy8 dation, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapukcn9wi:z22q: iy ymy-lt 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 aciknm :z-2qy:9yiyw2 c celeration is constant, what is the length of the catapult?

  A car starting from restb.u-wf.lb 4c q moves with constant acceleration 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 80mby8a980 h:o ;* kxjfu3btyae m/s in a distance of 200 m. What is its average acck 3b8ubax;ot8f9*e0yma y: jh eleration?

  An object starts from rest and undergoes uniform accele e*0 /z eudoofe:lu-7aration. During the first second it travels 7.2 m. How far will it travel during the third seconduz lo:0e -aduf*oee7 /?

  An object is moving in a straight line with constant acceleration. Initiallgyj5m,zn +)ayyw(b+ iukqt b(p60 3b iy it is traveling at 16 m/s. Three seconds later it is travub5)+kg,p bwm q3y (i y0tjab6yz+ ni(eling at 10 m/s. How far does it move during this time?

  A car starts from rest and ac/d:rw hs2blhj s0 2i4x (hyogf7/ig) ncelerates 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 dem9dtpm/ fn) j,celerate 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 waiting qcx 0 craiqhn 4cv/:+(1 cre;vat the intersection starts ahead with a constant accelc1 c :0 c+ 4/a;ecq(rivvhqnrxeration 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 a.* bv*icgpirq9xq9 2t/ xj5mupward with a speed of 12 m/s on the surface of planet X where the acc9m t *.5av*9x g bjxpq/riiqc2eleration 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 sp7*s+fn 4h*orubbd t/ keed of 12 m/s on the surface of planet X where the acceleratiob/ ns4kohtb *7fu+rd *n 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 with5d i j8b37 v;dotay;zc a speed of 15 m/s on the surface of planet X where tv8 o7ad35z;y jbci;d 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 upward with a specttvubk9l-01a i; s(+s xp0nied of 14 m/s on the surface of planet X where the acceleration due to gravi9+l1p0invs;sia t- 0ubk xct( ty 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 you d8,et(wx )aenn9urlhh e-b4 ;r friend holds a ruler between your fingers an9 8nelb) 4e-rt;uehwnha (,dx d 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 velocity46tz9cyv1z,u , mm kryf*s+a f after 3vufzf zy,ak +9c* 4s1rmt6y,m.00 s?

  A bullet shot straight up returns to its starting point in 5 s. lox8 na1w;j( l-aerf3What is the initix(af8ja3-nel ;wl o1 ral speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tak-. x9wpn :svtl(,pegh e to return to its shvtpp.xws - gl :(,en9tarting point?

  A ball is thrown downq eg i7q(()gx tn/qo*dward from the top of a building with an initial speed of 14 m/s. It strikes the ground after 1.3 s. How high is the building? qi 7dq ge/)qx(ognt*(

  A ball is thrown straight up with a speed of 30 .as 2igo+a ,ku6ep 7khm/s. (only fill in numerical value in the blanks) i 2.ug+ep,k o7ahska6
(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 oi*v:m i:e l/kspeed of 27.3 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity atptzp- h) f.dg3bpz9: o t = 1.0 s?

  In Fig. below, what is the q*uz d5gscb-,velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s?v-96q; xrcwktx8 qz ,b

  In Fig. below, what is the velocity at tb4.rfu: 7 p*dtw t5ak9gl,a*c/kyhkp = 5.5 s?

  In Fig. below, what is the average velocity from 0 t0)yu4 a)fstqoa ,lt )ko 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6. 73cqss h8zl:uz0oz2+xn. 7 kk+atuvd 0 s?

  In Fig. below, what is the acceleration atdg;c9gr xzcy+.7w:h;n:) f c-o hl sen 1.0 s?

  In Fig. below, what is th .1hpzl,m)bhzq3(kgqe acceleration at 3.0 s?

  In Fig. below, what is the average accelent + l4tu3+y w3aa;xzqn3vu6cration from 0 to 5.0 s?

  In Fig. below, what is the average acceler gew)4cazof yi931w ;ration from 0 to 8.0 s?

  In Fig. below, what is the displacemmcg ej u305g,2.a u4dc gycd 1ns6gud3ent from 0 to 8.0 s?

Does a car speedometer measure s30hvcp+:5v6 hdtr1gah. n ag lpeed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constantr4qdjh8f,w9s8 czur1b35si q .

  The velocity of an object can be negativeni7;/fgqt yn+0v kla .:ofjo( when its acceleration is positive.

  If one object has a greater speed than ab*lx3tj5hlh6 second object, the first must have a grea6 35* lbthxjhlter acceleration.

  Two cars emerge side q;t ive6oj9 o *gxytw *f6kg)/by side 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 accelhh8ino mf;4-q +:zwxm eration decreases.

  A baseball player hits a foul ball straight up into the air. It leaveso7 z9l,fn zm80,m erzr6pjz*p the bat with a speedlznp68z0 9me,fprm7 zz,j r*o 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 speerszp pnf60lxsuhnqy/38,h x3 t 73xm*ds up, what is happening to its acceleration, how doex3nnx f 0383hp uq6psz xlr/*hmts7, ys it change if air friction is ignored?

  As a freely falling object speeds up,2gmc8;zyd q*lekj i n( qm 1nq4s)2nw/ what is happening to its acceleration, how does it changeln e* 4(j8k1z2/d)my;w 2inqgqsqcm n if air friction CAN NOT be ignored?

  An object that is thrown verrjach mnz-p97*h1 z3rtically upward will return to its original position with the same speed as it had initially if air resism c h-ajrzpr1793*zh ntance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the samejn3ilq8-e ow( pvq ,h*1k sl(q time.

  An object can have nonzero velocity and zero accelera2 b+oqtkg+39faf sau6, iy kj/tion at the same time.

  An elevator moving from the gp06n 1xz0 lkhsecond floor to the fifth floor making no stops along the way has zero accelzh1g 0lxpk 06neration all the time.

  A rolling ball moves fr;+lmn,msv0pi lpvv * sdp. i)*om $x_1=2.7 \mathrm{~cm}$ to $x_2=-4.4 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. 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 $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete4v-q :gh/d8x ,8zvct; unbek x laps around 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 se)om4qc t (j,qih k,b92 ptl1 kn(xwh:traight line, moving 104 m away in 9.1 s. It then turns abruptlykh2t14k(i )q(wmc,bn: ,tpoeql9h x j 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 )qatav:-3 yudm $11 \; m/s$ 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 fromg v* qp);sc*ydhf/3 +zazfj)l $21 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ;2hy/q -q0w : ,pm2jnp wpvupf 1nh5qua speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can9o0wrqu d 7kvuqhlz4 +/ 2ha7e8kgh3c burst out of the blocks to essentially top speed abouw k7u94+/3zgu0 ahql82rh7hoqe v cdkt $11.0 \; m/s$ in the first 11.2 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 from a speedbdmgsh *l4b( c3s x0+n of $20 \; m/s$ to rest in 4.23 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/ 7b ddkaif.w.fmkcie78*z-x highway. Assuming fd bxid7wca*8i- .zek /k.mf 7a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr /8m.vh ys8p3jt9hx8 krvvxy ,uck 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 30.0 m5*mx i(/hpe;jawl 9ejin. After exactly 27.0 min, thel mwx j9/;eipaj* (5ehre 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?    $s$