Suppose that an object travels from one point in space to another. Makpga7z yoqlvwtk(:y /r beg+ 9qtg2497r2zh .ge a comparison between the displacement and the distqt92gp . k+l7eb y (t7zr2:4grgozv hwya9/qgance traveled.

  When is the average velocity of an object equal to the w 1-pfxxz l)dxlbh2l8e p334n instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty oehs ke)8 3ot 9wz)zs;x:qz1;7ru1g u p9nxxiin 8 s" n19os)gxuex;9 ) kx:8 zi7srz3;p eoq1wzht u. This is a description of

  An object moving in the +x axis experiences an acceler; 2mmt5y .htc9gxl fa0ation of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelinwwa (j rc7b6u3vxt4sp l l;l59g to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration;5wurx 7c9ab tp v(lljl346s w.

  Suppose that a car traveling to the West (-x disarymz(to1ep1q+2 3t rection) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratpt z3( 11 2sreay+oqmtion.

  Suppose that an object is moving with a constant lm;d4-wbu6m/cawag9 vqt.d-bx k 2)ivelocity. Make a statement concerning its acceler4.--ubg dvlqa/m6m;bkx2d a it)9wwcation.

  If the velocity of an object is zero, does it mean that the acc;g ih +apswsaaob3scam6zd+1 8 5pu;/eleration is zero? Suppo po6mzc ws1gusp;8sa b5 +i /ah;+3daart your answer with an example.

  Can an object's velocity change direction when its acceleration is consta77c lh pwivu)pbx;n.d88yy2e nt? Support yoey .)xw d c;y p2blipvu877h8nur answer with an example.

  Suppose that an object is moving witt.-q5fm 31jwnpf0j 3 bi pxes-h constant acceleration. Make a statement concerning its motion with respect to ti-3itjmwf 5-n.1sq0e3jfppx bme.

  Can an object have increasing speed while its accelerlhcfj6 :es;+ -ty5juw 4ncah;ation is decreasing? Suppor-cj ehs5; a h6ytc:n+fujlw;4t your answer with an example.

  Suppose a can, after an initial kick, moves g1j06c c h3aamup along a smooth hill of ice. Makeaj 136achg0c m a statement concerning its acceleration.

  Under what condition is average velocity equal to the aw r+p49j:lnb bd+n7ydverage of the object's initnj9p: wr4yl+dn7d + bbial and final velocity?

  Objects A and B both start at rest. 8mf-d ka5rkm4,ai lxml 5 1k0s They both accelerate at the same rate. However, object A acceleratm5,mam58ik 1 s4f0 xlal-kd rkes for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They botm tbgk-2 (srj0h accelerate at the same rate. However, object A accelerates for twice the time as object Bt-0bmsk (grj2 . What is the distance traveled by object A compared to that of object B?

  When an object is released from 7;++ gcxn zmvirest and falls in the absence of friction, which of the following is true concerning its motiognm;v7xz+ c+in?

  When an object is release kvccj6pvqh98 )-v6evdrsmdu ;5k8 y (d from rest and falls in the absence of friction, which of the following is true concecvced8h6m-9s5 kjup r v vy)vdq6k;(8rning its motion?

  Suppose a ball is th1 /7 mc4:9uatudscngnrown straight up. Make a statement about the velocity and the a4 ca:n c1ugt 97mu/sndcceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleratio5jo buys-i6 ; yqnvm4(n just before it reaches its highest (i;yyq6j4v5u n- mb ospoint?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls16 d ( efw-0pewcp +9ypszozx/ to its /eedxpf6opw- 9scyw z+10p(z initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initia vqnd::6drml4oc+ t:bl height. Make a statement about the direction of the ve:d br+tdm:lcq 6 :onv4locity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the aeid5 ./q8.ni enhznlhl04tb.bsence of air resistance. Make a statementd0e.tezi.i4hnl h5/. nnq8 bl concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is0)dz np spr.rki-wfbp:+w yc y* 957ho her acceleration when shkhdfy) w7 5.zopn w+ cps-:i 0rbp*ry9e she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second babs ix(ktz*qcty-ym7d 243 bn7:e18zs;ntti yll is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of thn s8tcmiztx *e 31nbtt7bsyqzk;y :-72yd i4(e 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 later, ball B is dropcj (r3iqzrb d ( tenw(6ybs* )an:)wa2da n1,yped from the same building. As time progresses, the distance betweenanr2(nyaz1c sq) )w t 6(bn(ra ,jwi:*de by3d them

  Ball A is dropped from the top of a building. One second later, ball B i (cao5 gne9 -w*hznaf;ys9/cas droppeas* 9hn ao5;/gz fecn cyaw(-9d from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, ahcd(dwz.c,:f nd the other is thrown down, both with the same initial speed. What are their,:d z hf.(wccd speeds when they hit the street?

  A brick is dropped f i: zwy55pm(wmrom the top of a building. A second brick is thrown straight down from the same buildim: z(5iwpy5wmng. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the5qq1xb gvy(vxs// go; +x axis. The position versus time graph of this object isqbxv qv1s;og y//5xg(

  An object is moving with constant non-zero acceleration in the +x axis. Th+0sa yrh94a.9 db hnjbe position versus 9aa4s9jn 0r+hyd.b hbtime graph of this object is

  An object is moving with consta 5oqwju(saf ,y:j67i ant non-zero velocity in the +x axis. The velocity versus time graph,i j6 :a w(ofja5qus7y of this object is

  An object is moving with constant non-zero accelea,v5il(o- toom f3/17fj f splration in the +x axis. The velocity versus time graph of this obj(,p so/a7offl1imj5tlv -o3f ect is

  The slope of a position versus time graph giv9 a/z2 nzn6qe:cegn;zes

  The slope of a velocity versus time gr l5* 1 bjwqacoulr0b/gg+i,8baph gives

  The area under a curve in an acceleration versus time gra/bcghlr0 vhi j. :u x9-n0c zdza,j7u4ph gives

  The area under a curve in a velocity verqh jup2g p07/rsus time graph gives

  If the position versus time graph of an object is a hg0eyhxw2 lprc1z xej3zw(y/ 1;cn )q3orizontal line, the object isrx /) 11ejexczzcg;(yp l3qn03w w2hy

  If the position versu)fxk5 1 0ukj+lhl +4fvj9sll nlj5e:ks time graph of an object is a vertical line, the object isk5vnkhfe1s ++j0jl kl)ll4ux5l jf9:

  If the velocity versus time graph of an object is a horizontal line, the object z2yvo e6ofi81 i1v6f oioy 28ezs

  If the velocity versus time graph of an object is a stplph)kqp m;* q*2; y)t9utsy ,z( xpmxraight line making an angle of 30 degrees with theumkqzpsty;2 p),xqh) *9pl * ( yx;mpt time axis, the object is

  An object moves 15.0 m north and then 11.0 m s2 u; 1htvuw77e5z uf9l0(nhiii (xgcjouth. Find both the distance traveled and the magnitude of the displacemeg 5j xw;ciz hhu2n7eu9ufv0ilit(71( nt vector.

  A boat can move at 30 km/h in still water. How long will itv i.p+1i3i gcnn y.:c.omx eazm0k., m take to move 12 km upstream in a river flony mei:m.ca po n+x.v.z 3giic km01,.wing 6.0 km/h?

  55 mi/h is how many m/sa68d/uwb;vsa w52rf 7bha gm0 ? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 hkynpt 7 pky) .ju/*fd*m1brh5 ?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 m8h2sg u3ar6mlin. What is the averalamu3g2h6s8r ge speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel ulgf- g z*f zcvr5r63)400 km?

  A ly (light year) is the distance that light travels in one year.h37.mjkbp-gv6 *ldclef5a 0 f The speed of lid3e h-fpcml50ba 6*vjk7g.f lght 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 looknz8b(l p f42oz to the side for 4.0 s, how far do you travel during this inattentivpzzfl4( b 8no2e period?

  If you run a complete loop around an outdoor track (400 m), in 10 grzzdcj:rmc5m/ h0jxe1.y0 -nv *e6t0 s, your average veloy v/5:* 0dx0rec j gmjzhrzmt. e-c6n1city is

  A polar bear starts at the North Polegt,ju6h)4w83v ufvsrsvk: t 0. It travels 1.0 km south, then 1.0 km east,vf6uj:8ws4t3uvht )vk 0,sr g 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 average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, j,.2(u wvtla(9t uxsl then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takesstl(ja 9ul2. tu(wv x, 45 min. What was the bear's average velocity?

  You are driving home on a weekend fro :a4llprn m)p8f02*r* 7w f6n ggfcls d/xki/sm school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home aft 4il0nfxdw a7cl8flmkg62:rf*prgss n)/p*/ er driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 16pap ) )-.it ww6amv. l(ejmst-0 km at 100 km/h. What is the average speed (6-tl)ma ivwts pe.aw-mp .j)of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100,1ijj2* wb;/)homckcwd3s)fx r/hw z km/h. What is her average speed for the tr/1 *)x ,mckc o 3;hjb2)jfwws dir/hwzip?

  An airplane travels at 300 mi/h south for 2.00 h and themms 07ab8u7ton at 250 mi/h north for 750 miles. What is the average sp8satu 7om7m0 beed for the trip?

  In a 400-m relay race the anchorman (the pers8tvu w zx:yz5;on who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team x8z:;t zv5uy wB, 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 anx/ s*nikb1lbd 5ish+ru /u)j/d comes to a stop after 14 s. The car's average velocity during deceleration was 71 km/h. What was the car's deceleration while slowinglsdbh i5xu ru1bs///j ink*+) down?

  An airplane increases its speed from 100 m/s to 160:amba.k1zw uoe/h;d+ m/s, at the average rate of z haa:.+k;o1d/ub em w$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acce)yb/e6m(q (hsl: ermu lerates 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 a-qoz vd5c()cf 7 f,qsfccelerates 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. n)5 ibrbkx1:z It then speeds up with a constant acceleration b1ik x5n)rb:zof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.3 m/s experiences a constant accelerationr52kkf9je0 l b ofe5r0k9 jk2bl f $2.6 \; m/s^2$. What is the cart's displacement during the first 4.4 s of its motion?

  A bullet moving horizontally to th9*-bd .ia a*fdd0nnqye right (+x direction) with a speed of 376 m/s strikes a sandbag and penetrates a dbdnn0 dqyia fad*-.9*istance of 60.61 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 cama u9; pn5oz;evjn6l6rrier. It reaches 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 u p;jenzlo m56avn6;9the catapult?

  A car starting from rest moves with consta2agr ,) .t 0te b3loihg:h/nnlnt 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 iek,.q0 lt4ou kn a distance of 200 m. What is its average acceleratio0 e4lku okq.t,n?

  An object starts from rest and undergoes unifan1cdg (s64kr4ab9lipzrl5 hij1)zf 3/k r2oorm acceleration. During the first second it traaob5/cak41ri s) h1lkp( 4 li6z2nz9dgjfr3rvels 3.0 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. :k6gjd .kxh7x Initially it is traveling at 16 m/s. Three seconds later it is travelingkx7 dk.jx6 :hg at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleaj/ jjwf lsp100xvqyb0h08/ fmgm+ j-rates 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 bwm(f1ag a97xon 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 beevqo-.gkw(;jqx y6 d8in waiting at the intersecdq(i6;owj 8 qgx.yv-k tion 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 planet82 zovaz9v80*cal1w,fsbz3 v ld,uyonrx8 9t X where the acceleration due ttl8a8wsf90 a lvz1u8y2,v c*zxb or3,n ozd 9vo 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/h/:uud+kiole+ x j:zgmkp/2 X where the acceleration due to gr:d: mkouk+2//le xjzp g+/i huavity 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 planet X wh m2 a mu3a+,6d) pm1mw7glnekmere the acceleration dueea3mpm gw16md kml7,u2 )n+ma 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 14tk4a0yqc)o) 6v c3ikgjo )op3 m/s on the surface of planet X where the acceleration due to gravity yp))gkio ca33)o oqj0ct4v6k is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater -ggqg7tu+ ce8( l ae9wthan 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can(ggtauece7w+l g 89q- you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. 53cxqxp1djpr(mad0.9ym -otrz ry45 What is its velocity after 3.00 y.ztp15(amxr m 90oyddqp 43-c5rxrjs?

  A bullet shot straight up returns to its smb(/de dots ;/tarting point in 16 s. What is the initial s ;(/obd/ temdspeed of the bullet?

  A ball is thrown straight up with a speed of 39g2pt, xm.lnj6m v8eg 6.0 m/s. How long does it take to return to its starting ponlmp ,e2.gv86 9tgm jxint?

  A ball is thrown downward from the t9uo 86ia3ebwf op of a building with an initial speed of 15 m/s. It strikes the ground after 1.76 8w93a efibou s. How high is the building?

  A ball is thrown straight up witpqtl:hvhf*6z2q 3 kfdk3ju-7 h a speed of 30 m/s. (only fill in numerical value inpqj u -dv:h27hfklz3kfqt6*3 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 the air with a speed w;)c cycc;m) ro-pl h:of 32.2 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is th9odro t1mo5g).u )dt ne velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 8u, lnhg+3up vs?

  In Fig. below, what is the velocity at t = 4v m(n-ble5 l(ick-g (*9zy flo.0 s?

  In Fig. below, what is the velocity at t = 5.5 rk. nu, 5jr1 dp4)3bvbslb8kos?

  In Fig. below, what is the average velocity from 0 yd 3qjbnh7w):to 4.0 s?

  In Fig. below, what is the averp 6:nroxb enx3*.q6/xpi q q wpo/c+5zage velocity from 0 to 6.0 s?

  In Fig. below, what is t a;sq4 hxg6l+che acceleration at 1.0 s?

  In Fig. below, what is the acceleration at +* ee-t8 ull)ny5 wdvu3.0 s?

  In Fig. below, what is 2(uos98qva )p( tf3,fp/o/x psl cgssthe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 sho:hn9 rmlkj v.:n94ds r7w3rt7 m6 md?

  In Fig. below, what is the displacement from 0 to 8.0 s?qw :si8 bt3 ulpun*49u

Does a car speedometer measure speed, velocity? {speed|velocity}ol8d+rt2u j1prwf5ia9n w-gc z n36)r

  An object can have a vawye 18s4/z rx 8vgsdt6-qdra5rying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration is positivx75macl s 2ei8i64spd e.

  If one object has a greater speed th +2aogx3z(e r18i:wi this m8jan a second object, the first must have a greatie 3j:ti8(+iar o218s gzxmwher acceleration.

  Two cars emerge side by side fro0 rr;zrnl2a(h kqw6 :lm 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 0 ,l6*sx6pfnn;mlum f in speed as its acceleration decreases.

  A baseball player hits a foulk1z o0dj;l, vb ball straight up into the air. It leaves the bat withj 10 z,vblodk; a speed 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 accelerat iuaz5mhh29 iwu+46ztion, how does ita65ztuwh2m ihz 4 9+iu change if air friction is ignored?

  As a freely falling object speeds up, what is happen*4/h rcv0pbthl ;kfu 0j/(u bxing to its acceleration, how does it change if air friction CAN l t40h;b/j fxp0vh(kc*b ru u/NOT be ignored?

  An object that is thrown vertically upward will return to its original posit5k*80cu qchxo ion with the same speed as it had initially if air resistance 5o8c hc*uqkx0is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zerli;-pcg7x 6rzog 9o3p o velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration atua3 zf -wa6e sn k4dbca+9,:dh the same time.

  An elevator moving from the second floo2xm)7ygpa16)zn f)xanf;qlu r to the fifth floor making no stops along the way has zero accele; xlgnuy 6)mpxn 2afa))f1q7 zration all the time.

  A rolling ball moves fr9 y::k5ct rgy4 oj- t:tkugx+i6w6hzyom $x_1=2.1 \mathrm{~cm}$ to $x_2=-8.1 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ 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 $t_1=-4.4 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completzm lp ky nnxs2.f0y5*)e laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.3 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 / gwwka()9neuline, moving 108 m away in 10.3 s. It then turns abruptly and gallops halfway ()ga9nke wuw/ 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 from6ivjp7yud 3uhlpj*r6 r 4347qyvcw 7w $10 \; m/s$ to $24 \; m/s$ 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 from *5 g* p+ 4k2lk)rf17teeecqt otije: v$15 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must recb59nuhfck7. k9bgcjgo 1 x25/jmh k5ach a speed of $27 \; m/s$ 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 cavwo* ry sc7ph9:k )mo8n burst out of the blocks to essentially top speed about w)c:p7yrhk9o*8m s vo $11.1 \; m/s$ in the first 10.2 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 fvo (1(2 ovu)(sdlbd -kmna4wp vi *72pcuow*wrom a speed of $19 \; m/s$ to rest in 5.96 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 highway. Assum v lekh:g- .(*ivjwtj; m(4m;q epbe8e7at*dring a deceleratione*(pjwt r7.e4id 8;htb: e*lm;qvk (- mjvgea of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goyyl p: tewr8++ing $25 \; m/s$ 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).    $m$