Suppose that an object travels from one point in space to anothe*nn6o i(ec+ jbr. Make a comparison betw+n e o*(ijnb6ceen the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous veloti.o p4toi2bka w:2-e+g-o1rfc ;lnz1i ag /fcity?

  A new car manufacturer advertises that their car can go "from zero to sp5 ytnp7wlv7ly+ r;f4 40jmda c*-grhixty in 8 s". This is a mr y5;p4pltwf+y jh a-7*4nrvc 7gl0ddescription of

  An object moving in the +x axis expbdh8dmmz+ 5 6eeriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to sl.-fl st3 k 9ufwj;y6ejow down as it approaches a traffic lighe-t f6lwsj3fy;jk9u .t. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x dirm0h3ux yxqohd776*t.7bs q qsection) begins to slow down as it approaches a traffic ligxyx7*hqo sqm7qbsdt70 36 h.uht. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a s( j u9,vhfo1dftatement concerni9duff1, j(voh ng its acceleration.

  If the velocity of an object is zero, du3n*w5tee hu;+no4tk z0 rnxb(yl+.hoes it mean that the acceleration is zero? Support3b ;nulx4znto 0*+5 weehuh ky r(+nt. your answer with an example.

  Can an object's velocity change direction when its acceleration is constant? S7)v 0lqrvu5mgvudp yz s+x 14,upport your answer with an exv zq gxy,)05 +l 7psvu4drumv1ample.

  Suppose that an object is moving with constant acceleration. bb+8, nocsaetz zzf o2u*,4)k Make a statement conce,)cua*nko, t zb 84fo2zzsbe+ rning its motion with respect to time.

  Can an object have increasingpbu,6s 7+ g8ktzr 9qlr speed while its acceleration is decreasing? Support yo qt9blr+ 6, r8zuk7gpsur answer with an example.

  Suppose a can, after an initial kick,ttl nftmpcv8/ ew)3+) nz5;j g moves up along a smooth hill of ice. Makejl8ftg5vm;e n +p3) nt/w)z ct a statement concerning its acceleration.

  Under what condition is average velocity equal t+x85d) 4ap5xq kil gamo the average of the object's initial and final velocitl5kia8d 54+)xagmqp x y?

  Objects A and B both start at r1 y(g8fglp wg0est. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speeg0ylwp18 (f ggd of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at 3e:uzb9zql6 eq3pbv .) ne- wz.yp4 vvthe same rate. However, object A accelerates fov63:le vzz.uzw 9y) -e.vbbpnq34qp er 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 the absence of fb/j9gh7ja-qko 3( nttriction, which of the fojgnk(7qa/3j -t9 obthllowing is true concerning its motion?

  When an object is released from rest and falls in the absence of frictpt aw0f(; ni0hion, which of the following is true concerning its matnpw0 h; if(0otion?

  Suppose a ball is thrown straight up. Mak gx:j. rtdv25ghg h,28uhor 4ke a statement about the velocity and the acceleration when the ball reaches the high4rt2,8hg2g dugvor:h .x kj 5hest point.

  Suppose a ball is thrown straight up. What is its acceleration just b 3f,.xjvm3c2qo)vhn: ,ag lvcefore it reaches its highest pn3o,x v2 cvfm:g,qjl3a.hv) coint?

  Suppose a ball is thrown straight up, reaches a maximum height, theyb7 x05hnmro6m h1h2 uo1 jqk .u/qh7dpw/lz. n falls to its initial height. Make a statement about the direction of the velxhhm qzh m5w /7.uk ojyqdbn/0r .l161up72hoocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its ih5tx7c q8o7 mvnitial height. Make a statement about the direction of the velocity and 875mcxvot7q h acceleration as the ball is coming down.

  Suppose a ball is thrown downward fqzqu3/ a5ty( ,v**5ma,xd fvbpjgb0in the absence of air resistance. Make a statement concernin *, p3 y/mu v5q*gzj50(bv,xq fatbafdg its acceleration.

  Suppose a skydiver jumps frf -o ojify sd ,e9hi,b*v7sh)4om a high-flying plane. What is her acceleration whejs7oivibeo 4hf f),,*d s 9-hyn she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identicx)3j g4p4 nnzxal 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 times h3gn x) j44zxpnigher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One seco3*8g ucq:p ohjq,isyui:l)j ) nd later, ball B is dropped from the same b 3g ): u8q:s iuh),cojylq*pjiuilding. As time progresses, the distance between them

  Ball A is dropped from the top oi3 a-bh05edwbf a building. One second later, ball B is dropped from w5hbbe-3i0ad the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the *2z k)c2fvafrbbz-kvo03d d ;6 wx;axtop of a tall building. One is thrown up, and the other is thrown down, both witak 0;vb2 2r6bffox-ddc)a ; xwkv3* zzh the same initial speed. What are their speeds when they hit the street?

  A brick is dropped frq( ttz;yv*e1 yws yc +t-e3xs1om the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistt yx ze3y+1etvq;-ws( yc *1stance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity ine:q0 rqao(3pyn;u m(v the +x axis. The position versus time graph of this ob y (voru3qe (q;m0pna:ject is

  An object is moving with constant non-zero acceleration in tlc ,frrpm1/q ky, n-8yhe +x axis. The position versus time graph of this objec/-y lqr 8f, pcnr1,kmyt is

  An object is moving with constant non-zero velocity in the +x axis. The velocit)g4+c +1 )2anrzpwew s h7zboty versus t)w1e74a+ +spwzz)cn2 ogbr htime graph of this object is

  An object is moving witpu7d gqq2 ;l g615qwkqh constant non-zero acceleration in the +x axis. The velocity versus time graph of this od;w6luqgpq57qk2q 1g bject is

  The slope of a position versus time graph g 9d xl laex:s4f+fmt t+l958apives

  The slope of a velocity versus time graph giv(y3mk+ua8p ug es

  The area under a curve in an acceleration versus timr+ 2o xfq0), oj4d8ibszhsy 0ie graph gives

  The area under a curve in a velocity versusmjuqqx15pi p h3w7sre0-. i ri;liq- 7 time graph gives

  If the position vers0(bne q 2a 7gc-pvtwa2uhpc9:us time graph of an object is a horizontal line, the object 0wv( a-bu 9p2apn c :htec7gq2is

  If the position versus time graph of an ob 8h; :kce:lzu9qfc l8 e-zerm3ject is a vertical line, the object isum 8lcc3 :r e-;:kefl9zq8zhe

  If the velocity versus time graph of an object is a horizontal ljr,)4yi 5f+l p1bw 8ezospy 7kine, the object isy b1f pw prslzk +7j8yo5,)ie4

  If the velocity versus time graph of an object is a 19bi p 7/irfw f9w 0nlkye*1jwstraight line making an angle of 30 degrees with the time axis, the objbfn1fw*k9p 7 r1iwilw9/e0 jyect is

  An object moves 15.0 m north and then 11.0 m south. Find bwc f.ljy*.(cl flz3(a8 yp kqv+y9+naoth the distance traveled and the magnitude of the displyy3clnp*za(+fl(v . 8qc+ wjy.lk9 faacement vector.

  A boat can move at 30 km/h in still water. How long w4luv+/yb r2b pill it take to move 12 km upstream in a river flowing 6.0 b/u +bry4 2vplkm/h?

  55 mi/h is how many m/s? (1 mi = 14b(cvex9f7e dkp8 x8 p609 m)

  What must be your average speed in b(m7.mysuhx-w6l d 3corder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 gm5auvn;50 oa cz4gr 3km) in 2 hours and 57 min. What is the average o0a 5; uva3 54grzgcnmspeed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to trav ci(10kr8c/ buu-edxl el 400 km?

  A ly (light year) is thezy25c 47/p ndodpmlo8 distance that light travels in one year. The speed of c48pm5/nl2o dz7 p oydlight 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 7 +bcosbb7 s+eyou look to the side for 4.0 s, how far do you travel during this inattentive periodss+obb c7b+7e?

  If you run a complete loop around an outdoor track (400 m/4- pm gx;h3 ofnuj(ut), in 100 s, your average velocx3;npf4 /(jht ou-gu mity is

  A polar bear starts at the North Pole. It twnzdt t+8h -w(ravels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to dtw8- +h(zwntreturn to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It tral 9b:ufk j wxk7ea* *f;v11etsvels 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'stw 7e:9 1;1jf bsva*leuk*xfk average velocity?

  You are driving home on a s/82 t--dm ,wo8lx/pfkvoge w+: dyzaweekend from 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 l : 2o- 8,modgw/fvzexa-dpskw+yt/8 school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/x16 u k5*62veg/2ooh hgvmswqh. What is the average speed of the motorist fov *g khv q 6o6xs2/omwu2hge51r this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100v (, 2k a.7gmnxmk (h,ytwv)jd0rwzu* km/h. What is her average speed for tv ,u7mt warxzwm20 , y.jd)( vnk(hg*khe trip?

  An airplane travels at 300 mi/h south for 2.00 h and t2ukl4 3c88 htl9;c1fhee kzqe hen at 250 mi/h north for 750 miles. What is the average speed for the trip?k l3 9e1lu z8q8cch;eek4tf2h

  In a 400-m relay race the anchorman (the person who runs the last q +dnju e2kg)-bc,) o/yh3puk100 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 runnpk,u bh- odun +3kge)cy/ j2)qer 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 card. 2wi16kf ntn's average velocit2d1 ntnf .k6iwy during deceleration was 64 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the av jk/a,j m;l9ccjc6kq 8erage rate of 8aq6 jmjkj9c , c;ck/l$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelv8ia ks) z:jt*erates 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 accelerates t uzsr91cc xk0s61ip,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 constanxp0rs+*/ sqeut acceleration+x0e p r/s*qus 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 7.0 m/ftpk;4+.e vy*h ohe 7ms experiences a constant acceleration o*;74mht+he .ofpk ey vf $2.0 \; m/s^2$. What is the cart's displacement during the first 9.5 s of its motion?

  A bullet moving horizontally to ih 3-vznv5 1zkthe right (+x direction) with a speed of 480 m/s strik 15-z ivvznk3hes a sandbag and penetrates a distance of 54.14 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It re5o3m;itylu4h* ; aq,d wlq nux )apw63aches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of 4a*wi6, ydua ;xnu;3qqt3womlh l p) 5the catapult?

  A car starting from rest movkyg;x m4f62 dkg(1ddres 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 80 m/s in a v66 gpt dlj9m.distance of 200 m. What is its average accelerati d6j.9vl gtp6mon?

  An object starts from rest and undergoes uniform acceleration. D wnkkaz (6rp,)inbn82;bp cu +96 djojuring the first second it travels 3.3 m. How far will it travel dpnn6689kn2zpc+;,j ) uiabbrk dojw (uring the third second?

  An object is moving in a straight line with constant accelerationtfwd i;.44l8) ecx) ,bsin9w (vn ufgs. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Howg.4f4v tn)sn9 belu,di8isx ;(w c)fw far does it move during this time?

  A car starts from rest and d9,lx;)-0x2emsfc q ,+0hq6dh fvte+ucsjk oaccelerates 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 deceler*(5vx)o fmolt ate 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 wai k * ou84, 46ue4jri q+8xdrj/jfqqbghting at the intersection starts ahead witj r44 obq+*fqd r j6hxu uki8qeg,48/jh 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 s,fbls64.pj2a.e pj bs3w/ r typeed of 12 m/s on the surface of planet X where the acceleration due toj,a. tep. l2wr/sj6pb ybf3s4 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 jae0hv5swn)qp jwqk,kr: 3(0the surface of planet X where the acceleration )nw0p3ew5 s,j( k k:rhvjqa0q 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 with a speed of 15 m/s on the surface of cf1 e,q dlx6w(planet X wheq(cwl, fxd16ere 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 speed of 14 m/s on tq1 q2al;b p7l f:ut3cfhe surface of planet X where the:q7;t3 af fq2b uc1lpl 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 gus: m4erphqg, ;hf c7* nipv+2reater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how f7pfipcs2 m:, eq+vu hr4*gnh;ar 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 z/v5a 9h4k +wzp,jslxa)qv p,velocity after 3aa9w) zzpl+/v kj h,,5qpvx4s.00 s?

  A bullet shot straight up returns nboj t1/vmy-6g,z m :cto its starting point in 16 s. What is the initial speed o- nmj16/mz ,yc:gtovb f the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. tq4 c9gjw17 xi How long does it take to return to its starting point?9q1 4j7tigcwx

  A ball is thrown downward from the top of a building with an i )jdafkh ,uo6,hj/3et nitial speed of 9 m/s. It strikes the ground after 3.3 ste/hh ja f, u,oj63)dk. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (onlycy5:; ku v3hdj fill in numerical value in th;dkuh:c5 vyj 3e 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 the aiqt-umkjq7zkh (y a18s8u (h 3ar with a speed of 29.6 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0e2;m0 cjqthfzxag2br2 ,0e7 f s?

  In Fig. below, what )jra1 hz)6/r *as ihpois the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 iz 1o5:oa-fv6wzg f -ls?

  In Fig. below, what is the velocpfz+ub4)ae *7ik- emv ity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?hkrj uh++u+ pi ,v9+pr

  In Fig. below, what is the average velocity:s fz nivw7,ik 36l1xc from 0 to 6.0 s?

  In Fig. below, what is5cu dao0 3u1m0szqy*j the acceleration at 1.0 s?

  In Fig. below, what is the acceleratb9b qy7rvn84lp:j )v(eh jn-s ion at 3.0 s?

  In Fig. below, what is the average acceleration from 0 ( /ml v,toth vbh6txfdfk/oe2.-)lp1 to 5.0 s?

  In Fig. below, what is theb edsji9 ;m ww)4(*lde average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacn + /vxcb;0;povkmjug.j2a8 qement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitib4wft)5tw.rnn jcfg)(bw 94y}

  An object can have a varying speed if its veloci-tdehwm) po-w/p5y pb /g9qi/ ty is constant.

  The velocity of an object can be negative when its acceleration9o7r(-pm2 miqjvp nk. is positive.

  If one object has a greater ek8k6dgi6r 2;( lpqb anp4e ;aspeed than a second object, the first must have a greater accelereq;6nb(2gk ;pkad a ilp e648ration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed of gzn/8vpnl: v($60 \; km/h$ 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 inc a,9+8d uzxic2kjp3 /isx *jydreasing in speed as its acceleration decreases.

  A baseball player hits a foul bal; jzfl4ezg og9v7* 0ll ,0s)kwnigbp3l straight up into the air. It leaves the bat with a s z ngieo0;f3w*p gsll9j bvl4,g07)k zpeed 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,lft) qtkdy*md+ mud4jj-25;o how doe qtddmd +t-koj*)u; 42lfymj5s it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its ac3qph:*ugegl0ohlc3i a:(7f e8fx2hv celeration, how does it change if air friction CAN NOT be gfo *lqvp7geh ex:h(0fuahc23l:i83 ignored?

  An object that is thrown vertically upward will return to its original poiv**a ri u:g3esition with the same speed as it had initiui:*g*ie3 va rally if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelq3n.x pg0ku)d1 ftx;e eration at the same time.

  An object can have nonzero velocit-ete m,d.k ea.big 0a 5uq3;epy and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floox9:n4afzlu) wu-wkveh, q * z jk7f98er making no stops along *9w4kf,9)e fe8 akv nwz7:jhxlq-uuz the way has zero acceleration all the time.

  A rolling ball moves f6wl 5us fpw0te,vlt8c) e (75bp2hy :myusb*arom $x_1=2.1 \mathrm{~cm}$ to $x_2=-7.4 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundyrp4(vc13o 13tsvwv j qp/o/i a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.6 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 straiwcnbto7/1 ) ,+ .fu9-mxlh/bjglzhfbght line, moving 91 m away in 13.2 s. It then turns abruptly and gallohb,nmgcf+ x1ubwzjlh// lbof9.7t- )ps 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 fro1iaij 8alnd c+3iq5 c2m $10 \; m/s$ to $22 \; m/s$ in 4.9 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 froys : o hthj)6a6i+/hkjm $17 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacsua /;n 9dey8nh a speed of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst ou pub2eg t62chn*zw- j81 dy-cit of the blocks to essentially top speed about pn*db-c6 tg ueyh z2j21-w8ci$10.5 \; m/s$ in the first 14.5 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 speed ofvobbj ov -gmv5:ei 1*5 $17 \; m/s$ to rest in 5.02 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m loi*.eu k+yy)w1rfgl0l ng on the highway. Assuming a di+ .eu *)rywky10l glfeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going xz * bc d-a-/ux1jsc.z$25 \; m/s$ 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).    $m$