Suppose that an object travels from one point in space to another. Make a l f1snf98ua ut1tx7+ys3u: 5+uxiddjcomparison between the displ fx7 i+:8lts3xuyd1uud9su atfjn51+ acement and the distance traveled.

  When is the average velocity of an object equal to w89 o)smu pj eho0f9qlk4ts9gn1+4 aj the instantaneous velocity?

  A new car manufacturer advertises tha (gekn)xk+v8eow-r4q(xb q-e fu *2mgt their car can go "from zero to sixty in 8 s". This is a descrig+x-*f2k8( kgoeq)qeu- rwnbxev( m 4ption of

  An object moving in th y v i,an55gdk*55mnnqe +x axis experiences 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 slow ddaq- nf,x 3zk1own as it appr 3xfa-dnqz, k1oaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (--lsmo 7ekyz5 r4 q(2+k bgexb)x direction) begins to slow down as it approaches a traffic lke kgoqz7ymbexsr5 l)b -+24 (ight. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant veloci +,170bjlg9s df)l6j hremhoxty. Make a statement concelrg 7e,ob+j 0x)mh9fdl js61hrning its acceleration.

  If the velocity of an object is zero, does it me+hs (-u6)s*jobcf/k 8m,q u-wxv wghuan that the acceleration is zero? Suppor)hss+o 8-uf( qk-,w /xu*jwcu mbv6ght your answer with an example.

  Can an object's velocity vwq,h gl+mh vh4g1q4,change direction when its acceleration is constant? Support4,h4ghv,+v wg1q lhmq your answer with an example.

  Suppose that an object is moving with con.vpzh6/olsk -ad/c 7 dstant acceleration. Make a statement concerningdacs7z.p vo 6/kld/h - its motion with respect to time.

  Can an object have increasing 36 t bebh2fu(sspeed while its acceleration is decreasing? Support your(bhbu36t 2 efs answer with an example.

  Suppose a can, after an initial kick, moves up along a smoo5irub8x d(k0*hyofou (8zal+ b/cojx;c z/m2th hill of ice. Make a statement concernin;zr8dbuyxuof a(+co/(mj x85obi* h0 k/ l2czg its acceleration.

  Under what condition is a4;iscw dsl5l(dn,u(average velocity equal to the average of the object's inld,n c; (sl5u 4awsid(itial and final velocity?

  Objects A and B both start at rest. They boa.5t0+ gs fx 0ahtdw,uyjt (*jth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of oaws(fy d *j0x tgta,hj t0u5.+bject A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the sa elhqg ;,hga l;gk10o3me rate. However, object A accelerath1k3gqlh ge , ;0loag;es 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 the absence of 1v) r8wuaddz 0w,nqi5y6i.ftfriction, which of the following is tr5dtq,y8r1if0wuniw d z.va)6 ue concerning its motion?

  When an object is releasip+gumpe6 )my : j9o(yed from rest and falls in the absence of friction, which of the following j6: ge+pm9mu)po i(yyis true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocit97w4p b +g tjshd3./8room yacy and the acceleration when the ball reaches the highest point/c37+mdwag r yo4o s.8 h9jtpb.

  Suppose a ball is thrown straight up. What is its acceleration just bi m(8,ezk gpqrquc8 nwkf* *f18n0* jec25glsefore it reaches its *wcziq1jg *f k 8e(gf8 cspr8e*k l5qmnu,0n2highest point?

  Suppose a ball is thrown straight up, reaches a maximums:3rf-c 7zrwh height, then falls to its initial height. Make a statemenzcr3w srh: f-7t about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, tr lt: 515bucbnhen falls to its initial height. Make a statement about the direction of the velocity and acceleration as n5lrt: 1u bc5bthe ball is coming down.

  Suppose a ball is thrown downward in the absence of a ,2 ogbb70jv40vgl cjair resistance. Make a statement concernin bg7j0vclob024j, v gag its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelert1qqv/n 1-, hr/qsj atation when she she reaches termi q1hn-v , /tjr1tqs/qanal velocity?

  A ball is thrown verticallyycbh* 0pzs*61ri(wr 4ljmba2r +pz5a upward with a speed v. An identical second ball is thp*abcy0+6 z1phlri25rzjm w*( ra4 bsrown 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 higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a bumegexx (h1 8:dilding. One second later, ball B is dropped from the same building. As time progresses, the distance be(:medxe 8hx g1tween them

  Ball A is dropped from the top of a building. One second later, ball B is yf4lta spp*(1 dropped from the same building. Ap(pfys1a 4*tls time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, anatg tlq)i v3.d o270- rmssv5yd the other is thrown down, both with the same initial speed. What are thei0sv 57 lgtary qv-2mi3s.) dtor speeds when they hit the street?

  A brick is dropped from the top of a buil)k)s*ijh1 qrj, iz t5tding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks. hris5tt,*j q)zi) 1jk

  An object is moving with constant non-zero velocu5,at +qm6 fqkity in the +x axis. The position versus time graph of this objectum5qq 6k,t+af is

  An object is moving with constant non-zero qnn gs5 qt+c axd2p4r.*:(-hyocpi(sacceleration in the +x axis. The position versus time graph of this objecah.n (5(y- ntp2 q+*droq:cc4sgpsixt is

  An object is moving with constant n6z0r j9sufa2non-zero velocity in the +x axis. The velocityu2 96fn arzsj0 versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +(g, phymhu1 r2x axis. The velocity versus time g2 ,g(rhmu1yhp raph of this object is

  The slope of a position versus time graph ,ujds7-d4cldgives

  The slope of a velocity ver r)p,nbl(we; isus time graph gives

  The area under a curve in an acchz ;a6t;*)w2h9krxo4fob phs eleration versus time graph gives

  The area under a curve in a velocity versus t2q ba knvz)(v-ime graph gives

  If the position versus time graph of an object is a horizontal line, the y9zh blz.k-mtjiol* /cr2 +5lobject isb zt.k hi 9corl*m5jl+y-lz/ 2

  If the position versus time graph of an object is a vertical line, the ob3,ui pj:(pc3ssmk ( hjject iskmj 33sc (hu, p:ps(ij

  If the velocity versus time grac2tu1 +4;pgo )fhkhu wph of an object is a horizontal line, the object i)k uhthc1p4+gu2 wo f;s

  If the velocity versus time graph of an object is a strait+,hplpx5m1pz k) ; ovght line making an angle of 30 degrees with the tpz kmolp,tv;p15x)+hime axis, the object is

  An object moves 15.0 m north and then q: 8dzfnurw8s gn(q4 9x1dw0x11.0 m south. Find both the distance traveled and the magnitude of x d18gn wwrd09f4( s qxnuq8z:the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take 4ow- nqasdaimk w)5x*r):tx,wt :: a cto move 12 km upst:wkoxtanm :r t4,x 5wqw)s)d-aac*:iream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 ml4w 5lfc n6gbo xm):3p)

  What must be your average speed in order to tbh*b. c2enp,oravel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Wsh) t+ -rwy-kw0vwk j0hat is the averagey0kwk-ws ) -ht+v0rjw speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 45d7q1.e1kyt fbv k( uh8u6bf q00 km?

  A ly (light year) is the distance that light travels in one yea:gs l l-o:l9ger. The speed of light islo l:sg :9-gle $3.00 \times 10^8 \; m/s$. 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 v-t,.b uaeh hqo :x0-rsui c);the side for 4.0 s, how far do you travel durht, q-.euh ri;x-as)b0o:vc uing this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s7kv8ma x1q kpo, h)b+a:/g 7hcy6ptx b, your average oaxba:1pp+cm76b)g thx ,/7 khv8kyqvelocity is

  A polar bear starts at the No2z94 zqbr+ tkerth 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 point. This trip takes 45 min. What 4ebz9 r+kt2zqwas the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 /h8sujg i +b( z0;omskkm east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. W kbz +jhg8o(si;usm/ 0hat was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for (1nm-lmlu,o s110 miles. It then starts moln-,( su lm1to 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/hbjy,jv3u sfox1 od8tv )g*1 u-. What is the average speed of the motorist for this triposog1 b-*x3 jtfjyvu8) ,ud1v ?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her0c b3o fgkex80qlpf /s*) *xxn average spee*xf/*3s qcxf0obl)8g0p ekn x d for the trip?

  An airplane travels at 300 mi/h so3oy* t50jnj bu88xj)-wdh5 me m7kajguth for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?5mmyenk) u8jadj7hob0x 8g* 5j t3-jw

  In a 400-m relay race the anchorman (the person who runs the last 1pypw((8hika g 1 c;rb900 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 y(1i;kb pp rga c9w8(hthe race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes tiz.8qy:.qqh h o a stop after 13 s. The car's average velocity during deceleration was 35 km/h. q.8.iqhq yh: zWhat was the car's deceleration while slowing down?

  An airplane increases i+m-89cos *berci s ag*8-u+ ccxy7 zkzts speed from 100 m/s to 160 m/s, at the average rate of y ciebcsz*u8m gzs-9 rkcca8x 7+-o+*$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceoe((kr ( km4 f*rfpi*hlerates 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 acceghbl08pz.g) iy b5b k,lerates 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 constant acceleratioe*1yrbebug 6 ul27kp9n o6bl u 7r1*gee yuk9p2bf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial veatt /--4we zkhlocity of 5.0 m/s experiences a constant acceleration o/a-z4k-hw te tf $3.3 \; m/s^2$. What is the cart's displacement during the first 5.4 s of its motion?

  A bullet moving horizontally to the rigehd -e5b 3o1rsht (+x direction) with a speed of 377 m/s - b3dros5h1e estrikes a sandbag and penetrates a distance of 17.61 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launchel.q qit);ulxpa,5ef 8p1,meo0q-v q 5 2vygpbd from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2..pp- 52bmyxvi8)loqqfqveqa l0,e p5 u ;gt1,0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with90 rjlik+l:3ma lq /eh 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 tzy8uq y-)uy-t o 80 m/s in a distance of 200 m. What is its average accele y8-q-u)zu yytration?

  An object starts from rest and undey+)ma tj:hk0z5xyu/36kd0jpurfo w5 rgoes uniform acceleration. During the first second it travels 9.8 m. How far wj605dywk)5ptfa3/:j zrh+ o u 0kymxu ill it travel during the third second?

  An object is moving in a straight line with constant ac ))f*rxv*yw*kplulhl ct5 :e1 celeration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far dock ulw **)thx*f )elv5ry1:pl es it move during this time?

  A car starts from rest and accel,0(.i rwi4rn)a x7 tpw;jsosierates 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 o n*q hvo,)y,001azp ftriz0tkn 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 waitingxi,t klaruyv3 (vu9* 5 at the intersection starts ahead with a constant acc,5vit u9(ykauxr*l 3veleration 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 gbrhh mk x 4y18(8i2vyof 12 m/s on the surface of planet X where the acceleration due tor2kxmvb (84g 1y8hihy 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 thk , :7om 2h/ oiv7nlxe,v:/1l atbgqwhe surface of planet X where the accelerationt:l21keo7o, xv/n/,gv qh mlbahw7 :i 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 planet X wbb-pdw)s*j9hu xoagb .3 b: 5xhere the acceleration due to gsobb*: 3w g5-jxud.b9h ax)pbravity 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 the surface of plae q,,xuy,zuoe 93ag7l-xw ; hmnet X where mou,q,,geu a e hw937xlyz-;xthe 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 greater than 0.10 s. If your friend holds a rulen rus+ zfr,,sjd3 :n8fjz l,y2r between your fingers and releases it without warning, how far can you expect the rjzyfl, j8zf u3,rn2+r d :sn,suler to fall before you catch it?

  A ball is thrown upward at a velocity ofusx99 )- kc cjw;dbs w7xuf4)n 19.6 m/s. What is its velocity after 3.00 jc c4 k;-xxunsws7u)f)99wbd s?

  A bullet shot straight up returns to its dd(tuv ehhx(:r0/d vo)3s)vn starting point in 8 s. What is the initial speed srd )t :o(3v(huv)0dh/dnxe vof the bullet?

  A ball is thrown straight up with a speed of 36pe79wdg2q mwq04d) pe .0 m/s. How long does it take to return to its sw p7) mw4 qe2gdep90dqtarting point?

  A ball is thrown downward from the top of a building with an initial speed of 2m57q rtxw5l *b9 m/s. It strikes the ground after 4.9 s. How high is the but55*bq 7m wxrlilding?

  A ball is thrown straight up with+i043gohj0 )pyxe )dm( xptqx a speed of 30 m/s. (only fill in numerical value i)jpx+3iq)x4ehd p(t0 0ymgxon 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 of 25.7 m/s. (yg8k zf:t* uuuz 1x/d6-u qu9iuse $g=10 \; m/s^2$, 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 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 is the +riuxr)u4bjn2 ,+tfu velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2* i:+k7rk4 ttkvy gyd+.5 s?

  In Fig. below, what is the velocity at t yz -q/gm zuht867es*f= 4.0 s?

  In Fig. below, what is the veloc l3v+ w4s grjigei )/swicjb7)4ex3f3ity at t = 5.5 s?

  In Fig. below, what is the average velocig 8b m6u3rop hcm7ni4fl3dl/ 7ty from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.2nn6llp2mc u si5l36 t0 s?

  In Fig. below, what fpp s .h;udm/+is the acceleration at 1.0 s?

  In Fig. below, what is the ac2 ;/x r,ytw cezr8iosp ;h)ls5celeration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 ttexgyql+y3 3 t2g 2dz9o 5.0 s?

  In Fig. below, what is the average acceleration from 0 e b)4bu49 oak56lftjfm65 vve to 8.0 s?

  In Fig. below, what i2o2 69 /pcngqwrf8n0l mnx ogxl40a4 xs the displacement from 0 to 8.0 s?

Does a car speedometer measureyf1 + qmtme8i5e5q8xs speed, velocity? {speed|velocity}

  An object can have ayrd8q4rx83cqqxwyp m 7 4d 9-u varying speed if its velocity is constant.

  The velocity of an object can be negative when its acc*m39 hedsn.x /zd+sph,y3*wg pr( w qa1dnu;ieleration is positive.

  If one object has a greater speed than a second object, the first must h/g596zze ft40 c8dio5fqtsahave a gre9 adqhef5i04/5zg z6 8tosf ctater acceleration.

  Two cars emerge side by side from a t 6- dqb4lo*or6jv o4qt3p4pxw unnel. 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 +/oi6- ehp4)c um oxswin speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaveslw,.w o5b (ru+pm sq6/+3zjvxq ebtc/ the bat with a spee x/,56 qpt3/.ovr+elzmq( jcuwbsw b+d 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 qt//d 6imxo3i)5uhneto its acceleration, how does it chan idhi) nu 5/mt3qxo/e6ge if air friction is ignored?

  As a freely falling object speeds up, ,;fp1 arbfn3 r wm,cojl5fl4/what is happening to its acceleration, howc,af5r,1w3f ;mblj4 p/lnrof does it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original po osy/i,nookl1c*o t 1s(o30 xdsition with the same speed as it had initially if air resistance is negligible. If ao,oxknoso3t* i0y/ 1(dl o1 csir resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accv7 sf*yjjcm /0eleration at the same time.

  An object can have nonzero velocity and z1bm5ttpoab;zqp 7ykf0.5b ; yero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops afdrnb-x3o6qly) +rp..g8w uy long the way has zero acceleration all the tu x8rp-l rgy6q3+dyn. fwb)o.ime.

  A rolling ball moves from /cv36a0mc93i r-qa6kgi m -jdt)ubvo $x_1=2.2 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=3.0 \mathrm{~s}$ 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 $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mil3zh7iv tyh f 1ec05j(ae ($1 \; mile = 1609 \; m$) track in a total time of 10.6 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, moxlj . + 7vkuk17ulc,wtving 107 m away in 13.5 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its ,ukwj1 lutl 7.c vxk7+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 fro55x.(wv+cdyrdh ic6y7 d ww7p8n o.brm $13 \; m/s$ to $23 \; m/s$ 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 fro4 ( eb h 6t7hox2ldb*jhyvm.)lm $17 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ofs- *-yzgbzj k. $30 \; m/s$ 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 can burst out of the blocks to essenti * pcyi,pdh5ae-bwj9xk8rc. 9ally top speed aboupy i9hd5c 9x . a-prjk*c,ew8bt $11.3 \; m/s$ in the first 14.9 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 al sc1z na a.+6w;ubso. speed of $19 \; m/s$ to rest in 4.19 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. Assumi.j99:auq f;xa46i.iq2d q w,odbdwoung a deciubw,d.2qj 9d6dq;x4 uo.ai:aoqwf 9eleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckb3 qec ew6l(wopj28j- 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 min. After exactug: 54keqm dpiv3o55uly 27.0 min, there are still 1100 m to go. The runner must then acceleratq uk 3vdp oge545mui5:e at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$