Suppose that an object travels from one point in space to another. Make a cw.yk ccpb +2(a) gbi;bomparison between the displacement and t.)(aig ;ckc b2wbbyp +he distance traveled.

  When is the average v0lrbc3ou0ftjj - hl /q /3t3goelocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty)j/ko ou;(rz c in 8 srk(z) /oju; co". This is a description of

  An object moving in the +x axis experiences5z qmr jm: /p9tmfq1m3 an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) bv0y h/m, f3 8ba6lzd: v.y(+xymie(acyt0dbd egins to slow down as it approaches a traffic light. Make a statement conce,lmm+3aye/dc.:h zvd vt ia(x0y6db8y(b y0frning its acceleration.

  Suppose that a car traveling to the West (-x dipxg 7luxer6 82rection) begins to slow down as it approac7 86uer2pgxxl hes a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a con ,hrn2*b+ y;6qj zjumnstant velocity. Make a statement concerning its acce q,ur+;2*h n ymznjj6bleration.

  If the velocity of an object is zero, does it mean that the accelerations5 t4.d9j- 1*qle iabay6ylz i is zero? Support your answer with an example.-a sl146*ebqtii59yl zya. jd

  Can an object's velocity change directio/v2d ;wrjc 3s2jmd0 6b dh;mh10psioo n when its acceleration is constant? Support your i;sh 3;dh0djrj6vs 0/ p2wdcb moom12answer with an example.

  Suppose that an object is moving with constanu b rr35,znuk4f4rkw.t acceleration. Make a statement concerning ,knzf.k54bwruu rr4 3its motion with respect to time.

  Can an object have increasing loy z(vvdz9sp3 r(o/4x v2ruw2dl:( e speed while its acceleration is decreasing? Support your answer pxv9wl/olo (r2zev3r dds:vz2 y 4u(( with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.-3apmogh p91e Make a statement cmep9ap3go- h 1oncerning its acceleration.

  Under what condition is average velocity equal to the average of the objeuhr cpkgzy 2v-h6u5gas7 9a- 1ct's initial and final veloc9r-h -uy 6vuphskaz7 g52cag1ity?

  Objects A and B both start at resdxu7sfsl-h2o0c i(8xb8dclm sl8n, ,t. They both accelerate at the same rate. However, object A accelerates for twice the time as object B.oicm( - sl,ud8 08nlbcsx7fdh,xl28 s What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the d/dpo0/2) s: fn3aau or:ubiosame rate. However, object A accelerates for twice the time as object B. What is the distance traveled by o:)b/of2 rnd: od pai0au/u3osbject A compared to that of object B?

  When an object is released from rest and falls v*bid 54n vpaz0gm+9l in the absence of friction, which of the following is true concerning +4mzd 0lnvpgv9 ia5*b its motion?

  When an object is released from rest and fall0.k8 r szqx2a, xoh.xus in the absence of friction, which of a xqok,h. 80su rxz2.xthe following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the veloc+xu ;q/l6 psc3qbp*pcity and the acc*;l cu+s6/pb pcq qx3peleration when the ball reaches the highest point.

  Suppose a ball is thrown straightuo15)tqr d9hu up. What is its acceleration just before it reaches its hig)ruod 19 t5hquhest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to iwv 4 malx45 )2kjl/hd)i :z4nmama wn9ts init 4w4a)n mkl vjh:/ma9)z5nlxaim4d2 wial 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 fahc c,1(025 m7kwfqdklw uxz+g lls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is dm 7 ,w1chw+20u5lx gzkf(kqc coming down.

  Suppose a ball is thrown v(l *k-cu g9pr 8 5 bppqbo w;jh,m(5suomwu6)downward in the absence of air resistance. Make a statement concerning its acceleratw5h*,;w v9lc(pombpp-5 j kuosg qu 8)6bu(mrion.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerataroh:s pw79 z1ion when hsr 7z p:1w9oashe she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An jo d9*4xlyxq; identical second ball is thrown upward with a speed9 dojq*4xx;yl 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 building. One second later, ball B is drbj - uh0,2hdsuopped from the same building. As time progresses, the distance betwed0,u2jhb ush -en them

  Ball A is dropped from the top of a building. One second lavpno r se:pty+j6,*(ater, ball B is dropped from the same building. As time progresses, the differenc,e pjo(6rap vsy:tn +*e in their speeds

  Two objects are thrown from the top of a tall building. Onewzjx s l52mn(+ is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the sn(jz w+s2 lxm5treet?

  A brick is dropped from the top of a building. A second brick is thrown sto/*p* +opg tgtraight down from the same building. They are released at the same time* /opg*top gt+. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with u h-4nze8p3 meconstant non-zero velocity in the +x axis. The position versus time uepzhm8 4- 3engraph of this object is

  An object is moving with co9lrlq lu,l/3i4 mjro* c;:jhsnstant non-zero acceleration in the +x axis. The position versus :jrl /ql4rcohmjl 9i,u;*l s3time graph of this object is

  An object is moving with constant non-zero velocity in thq hupv;2sn,b(gpx, 5ae +x axis. The velocity versus time grap5s;u n, x2qb apg(vph,h of this object is

  An object is moving witzl v21wv0pc6kwmai i jz70)f 8h constant non-zero acceleration in the +x axis. The velocity v20mkafij)6vwc7p10 z w iz8l versus time graph of this object is

  The slope of a positu3bywoek 117( * cy1*hluq uuzion versus time graph gives

  The slope of a velocity versusfi5qd-+5m oy7 jdd n ,p*m/u g-ppt0ax time graph gives

  The area under a curve in an acceleration06ac )j39 8 ezpylt*oe-p*hi/iuvqm c versus time graph gives

  The area under a curve in a veloctvi0zcgi7/h )h k e ,pd6de(d+ity versus time graph gives

  If the position versus t9q)(d5dd8j3ltmv vj ke ekb+h s0)5on ime graph of an object is a horizontal line, the object i( jlqndhtdbedm e539 0kj)+vk8o5v )s s

  If the position versus time graph of an objectgypn 1 9ho.sb) is a vertical line, the object isby9so).gp n h1

  If the velocity versus time graph of an object is a horizy+x;v6bom)5q -mu d gyontal line, the object isbm 5y omxuqg 6-+;)vyd

  If the velocity versus time graph of an object is a straight yf5d025wusg/: wdckl y3s)o cline making an angle of 30 degrees with the time axis, the/y2fu:kdoy c5) 5wlw3 s gscd0 object is

  An object moves 15.0 m northi5aij .w+7 xxb and then 11.0 m south. Find both the distance traveled and the mawbxix5 7.i+ja gnitude of the displacement vector.

  A boat can move at 30 km/h in stjkxu3j65v lxevn5 u8 rp5:j8rill water. How long will it take to move 12 km upstream in a river flo6x 8ju u5ep rjvl5 :8jx53nkrvwing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)xw. kovdn,p/+

  What must be your average speed in order to travel 350 km in 5. l6 eqv8ppln*;15 h?

  A runner ran the marathon (approximately 42.0:jlvu7xu xj.1 km) in 2 hours and 57 min. What is the average speed of :xux71jlv j u.the runner in m/s?

  A car travels 90 km/h. How long does it take for it to trap /g1.gysh19shrly 7gvel 400 km?

  A ly (light year) is l 5a h44j.sx l/ppy,bp;z;xmv the distance that light travels in one year. The speed of ligh;, ll.shj5b xp4x yv/;4apmz pt 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 road4 uuj+a7y ;qxyxtc,j 3 and you look to the side for 4.0 s, how far do you travel duy7y43+ajx ;ju,c utxq ring this inattentive period?

  If you run a complete loop around an ou/j;sq fy3 :xxgtdoor track (400 m), in 100 s, your average veloxq: /xfysg; 3jcity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0y, f-jz d(no3; zmj,yiv5j/c c km east, tyzjic;,/djf,5nc-o vz3m y j (hen 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 rdsa79q4 tf. 4022mh55gwf0vo0 tfi tvkrig r 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its stafksav42tt.0m0giiq 0fr g4vrw hotdf 79255rrting point. 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 for 110 miles. tht mq4q0tss4ok5,j)v*dfeh y * ;f(zIt 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 hometqzy* tt (ke;omh ,jtdf54s )q4vfs* h0own from school?

  A motorist travels 160 km at 80 km/h and 165phwwsa:, cvedx- z800 km at 100 km/h. What is the average speed of the w- swzec5 h:vdp,8a0 xmotorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/ *dbxde4ft3le 3;zwmx+8u4 dbnqk c4*h. What is her average speed fo4u mb+tenzk x*e*f 3l;x8dwbdd4 34cqr the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fo0:an .wdeaqy7r 750 mileey.n0q7wa:ad s. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who wawkr;lk+)08k 7 q p+,hiexjfruns the last 100 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 the r0a r,jkh8kl w piw+ )xfke7+q;ace, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after kfgn g.ftdr/kt1 /0 q.8 s. The car's average velocity during deceleration was 39 km/h. What was the car's deceleration while slowing downf t kt0gf.r1/qn/.dk g?

  An airplane increases its spehaz8 9*khseydpf ov+ y-(q/) bed from 100 m/s to 160 m/s, at the average rate of 9/ -d8pysyqo* hhe(kb vz +)af$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerateut3bh,jcsz(+6 t g6 7g0pgtuts 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 at pf2zd+p/nsj oog 9* f-q1 cy+y$4.0 \; m/s^2$ 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 spu6 gfvibe*7lypz69 w hc4h),peeds up with a constant acceleration of yh w79ivpu *f6l)ghc 6eb4,zp$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial v/q .ik3s 5rc hf85fpk)sjax/oelocity of 6.3 m/s experiences a constant acceleration off/)i 3pjsfkk co 5x.a8s hq5r/ $3.5 \; m/s^2$. What is the cart's displacement during the first 8.0 s of its motion?

  A bullet moving horizontally to the right (+x dydt y dyps;42tvduz2rm, m.*h+h 6e8 iirection) with a speed of 394 m/s strikes a sayi,u4myt8 dd2h;vy+6. prsed z* tmh 2ndbag and penetrates a distance of 79.27 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 carrif63 n xa.vf2pier. 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 isai2 f.6f3 pnvx the length of the catapult?

  A car starting from rest moves with qwfflo- x b;r5a5r)m6constant 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 distance of 200 m. What is its avpjf7 4tj;(z+ih3cdt/ qiwbj*erage acceleratioptw7/qb3jj *(zd;hic+4t ijf n?

  An object starts from rest andnv /4a:jx6c llgi g.u 5ts9:if;vlh1m undergoes uniform acceleration. During the first second it travels 2.1 m. h g1c 5 t:u6/l9.if ga;4j:lmsvv ilxn How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. tl8u +)o:/iv;k nzchoszge(- Initially it is travg)k(/;+- 8zunh t lo:eosvziceling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from re si7 d2hrj )+pfo0j6zlst and 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 um;4l p) k7ob3y;oxtsroad 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 thatpnomc5 m o21g9y;x)*rgvh a 4n has been waiting at the intersection starts ahey*m;ono9hn 1a 5 g cvm)g4x2prad 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 ofhl 6+2xf k-tst 12 m/s on the surface of planet X where the acceleration due to gravity i6t+k2h lxsf-t s $1.5 \; m/s^2$. 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 plhzsuc*v*k. 3ue-0b le- y6cdvanet X where the acceleration due to grav*z0 dv-.v c6 ck3 subluy*-eheity 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 surfa) j();eh sk0 5bwshv5qkeui; kce of planet X where thk)5 ueesw kh;b;0qsv (ki 5h)je 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 wit h) h (aq-h/icleqqt4*o2op(fh a speed of 14 m/s on the surface of planet X where the accel4lohhiqo )p c2teqqa-hf( *( /eration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is us7iq1 gkfk)o3 sually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far ogfk1s)73ik q can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Wxznhswql5,yk 2 7/s5j hat is its velocity after 3.00 s5ws2jlk/,y nh qx57zs?

  A bullet shot straight up returns to its starting point in 19 s. ixsa :.8u/ mm5olkh9r What is the initi5x:o/m89l auir msk. hal speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. xmjgg-l 04cj.hh4dzx+ sepilh4 1(n3How long does it take to return1z pcd 34ljhe j4x- .mi(hsnghl04g+x to its starting point?

  A ball is thrown downward from the top of a building with an initial speed n;p2.c+c fkg5, 9rjb kt jgvr/of 19 m/s. It strikes the grounfg5r,bg j9.c; 2 /rcjp ktvk+nd after 2.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m zvar5,qtp./p 3i,f mn/s. (only fill in numerical value in the blanksq,invp/mz.,f atp35 r )
(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 speeh xifin+k2x/z if m9-8d of 49.9 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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is g2fuh/5kkuj.ynp 3 i: the velocity at t = 1.0 s?

  In Fig. below, what is the velocity y ep-c 8r;-sd/gwl3ob at t = 2.5 s?

  In Fig. below, what is the ve q 54j0kttmt58id( nxqk6w) ltlocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 v:dv)c bv ny6:i6wzh-s?

  In Fig. below, what is the average velocity from 0 to 4k1fi.gc s .- zjrz6q n:g)z4fn.0 s?

  In Fig. below, what is the average velocity frkw atkle 8,0zw)o1qf: om 0 to 6.0 s?

  In Fig. below, what y31sy4n cw rt 1i:bg:c2h h0wjis the acceleration at 1.0 s?

  In Fig. below, what is then.n8u n+xh 2ep acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0tsl/8jdvlf,p0qnh2 x1 h bib45nq9l; s?

  In Fig. below, what is the average acceleration from 0 to 82di w 0gx. 02rui7e w8dx;vnka.0 s?

  In Fig. below, what is the displacement from 0a lx11(qj)9cbfihkf / to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloci- 2z,iwqoyiptxq b2qsd *1( w-ty}

  An object can have a varying speed if its velocity ed ),-fvfc s1uis constant.

  The velocity of an object can be negative when its acceleration is positive.9xj3,. lpefh p

  If one object has a greater speed than a second object, the fir(s -c o tcs*z7l3l k*rpd,a5jnst must have a grea dztrk*nola *c, p73 jl-(s5cster acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling wzumbc/ rko .2/lw5b4pe sh3/u ith 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 8i)iix :ab c ynewrpz 8(-w9e9as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. Iy:;i42k ( 1l(av tv5rotk vlart leaves the bat with a speed o t4ri:l lyv;r (kt2 (v5avaok1f $120 \; km/h$. 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 r8o+sy;9b2opg+ a*v ci)w vno happening to its acceleration, how does it change if air friction is i;+n2vioac *+p9grs)w bvo o8y gnored?

  As a freely falling object speeds up, what is happening tof+( ,pqxfh e mzxax,.3 jn0-zz its acceleration, how does it cha,x mfha+zpz(nfj3q ex. z -,x0nge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its o/s oaqvz c3k4e 7dsgk0 *;(,fjzf hzw+riginal position with the same speed as it had initially if air resista e4+ fgh/caqw;3j7* fosd(zk0k ,zzsvnce is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzer*)zzemh tf,n cv;i*jgy5 7s f0o acceleration at the same time.

  An object can have nonzero velo8a) whfzg;s30hk0js 59uazc jlgw, ;ycity and zero acceleration at the same time.

  An elevator moving from the second flo 8rxv,a1lw+h bor to the fifth floor making no stops alonr ba1v8, +whxlg the way has zero acceleration all the time.

  A rolling ball moves from 3 ti .nevgk5ng3d .6/,dlf.xuiry ui9$x_1=3.0 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.0 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ 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 quart qd0 2y0ofo7gler-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its traine7 ,yolkc sga3-r in a straight line, moving 88 m away in 8.4 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (l-ak3ygocs 7, 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*m/ng f -j9qi9esf9yzm $13 \; m/s$ to $22 \; m/s$ in 5.6 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 fromcj24e9n2eh/o byvud6l )3uce $17 \; m/s$ 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 of m )q5gq( zgz1 /h*bquw$30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to esse +hv655*9k .peh ;d9nhxzo lpbauty +entially top speed aboutdo6eh b;z+uvxhnl *phpy.k +5 99 5tae $10.9 \; m/s$ in the first 11.5 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 of ih:h;o)s./ 8 dpie dzk$19 \; m/s$ to rest in 5.49 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 th9qemmw 8ju4 xpo 3c-8ee highway. Assuming a deceleratiocx3q p8 oeu48jmm9- ewn of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck t-*6 vxin te;6+zdxhcgoing $25 \; m/s$ 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 rnuey6bf .836 tc;bqo aun in less than 30.0 min. After exactly 27.0 min, there are still663f.ycban8u eb ;toq 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?    $s$