Suppose that an object travels from one point in space to anothe/ zpumr eeo3bgm,u6hxlvz 8o*6u e//,r. Make a compazehmv mpr*/6e oz3,e uo 68/b xl,u/ugrison between the displacement and the distance traveled.

  When is the average velocico,)i q90c lgvlfd0t7ty of an object equal to the instantaneous velocity?

  A new car manufacture c+iu nwric+:zh5d wk5i;dx:7 r advertises that their car can go "from zero to sixty in 8 s". This w::diu d+ixnic+57 zrhc5;wkis a description of

  An object moving in the +x axis experiences an accelnj : ;qnd4jgn0. ksa4 sf,(yiseration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Eas a/xnhxr c h9qc0+4g:bt (+x direction) begins to slow down as it approaches a traffic light. Make a b0hh/aqnrc49 x c+xg:statement concerning its acceleration.

  Suppose that a car travel *yqhc(9w frem1(*q izing to the West (-x direction) begins to slow down as it approaches a traffic light. (h(qwcef*zr1m yi*q9Make a statement concerning its acceleration.

  Suppose that an object is moving with a 9cra h,btyx7 r-x7c9dc8 v: ared4yc 3constant velocity. Make a statement concerning its acceleration.8 ryxxhace-r yt ,dvc39:a97r7ccdb4

  If the velocity of an object is zero, does it mean that the acc( lf xpzum2 e/d-w7s6 kkj,p7celeration is zero? Support your pj k2sc6pfde-l,7m xz(u/k w7answer with an example.

  Can an object's velocity change direction when its acceleration is constant?fw spn1fp c06 -nwpadg:i6+ 8x Support your answer with an exampl-f :pn08cpw16 i+sxa6fd p nwge.

  Suppose that an objesffau 2aw0jg, vk1;/jy-8 *,i.wd ysiuyjd9 a ct is moving with constant acceleration. Make a statement concerning its mos/u,a0 yisf2uj jw8 ki dw.a1;yf,-jy*agvd9 tion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Suppe4 j2zaw p; yq3vb9;bwm e3(qlort your ansjw4e2 q33am v;e wyq bl(pz9b;wer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hil)3to;av6 0v4lq zipiel of ice. Make a statement concerning its accelerati 0v3t pia4)qel6 zov;ion.

  Under what condition is average velocity equal to thxcx/v +-saegh) 4o,uwe average of the object's initialx-asx w) guc/v 4,oh+e and final velocity?

  Objects A and B both start at rest. They both accelera y4 7,mbflfc)fyp t4m5te at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to tt)7mfp45c flm4 y,bfyhat of object B?

  Objects A and B both start from 4 idcj;/.m2y5pylk br)cl +s,ybtxkb d9t65nrest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance travely )di,sb26/j;nbcy4drty5tpk kx lmb c+9 . 5led by object A compared to that of object B?

  When an object is released from rest and falls in the absence oq;oj 3-e utc+7r+ sp2 afmjv6wf friction, which of the following7vs- wupfqtma2co 6j+r 3+e;j is true concerning its motion?

  When an object is releawy*f /gs44tg osed from rest and falls in the absence of friction, which of the following is true conco/4y fg 4wst*gerning its motion?

  Suppose a ball is thrown straight up. Make a thd2h.v ynjh: -z. )zvstatement about the velocity and the acceleratiohntvz2 hd. -jvz)y.h:n when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it r5v(k e* 5ogrypeaches its highest poiev5ory( p*g k5nt?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallpzpjdk w/(0k 1s to its initial height. Make/pdk0 1kpjwz( a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a mbo6y fg1 klm0(lo2n/yaximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down. y l6om2/0goy1 fkn(lb

  Suppose a ball is thrown downward in the absence of air resis/se+m-dna*uo tance. Make a statement concerning its a m/o-+*uasndecceleration.

  Suppose a skydiver jumps from aa 8pvi g*tj;b9 high-flying plane. What is her acceleration when she she reachetga98bpjvi ;*s terminal velocity?

  A ball is thrown vertically upward with a v x(z5ey5e*ns b1n: fxspeed v. An identical 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 higher does the seco5nbv n5y1e *ze s:(fxxnd ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B is droppvwoqlurkt 6.2,oibx *0+lo .rg7j1 psed from the same builrqrl+2sgjtlb0uwo.o 1iv* 7 , p6.xokding. As time progresses, the distance between them

  Ball A is dropped from the tzogwm;494 hef(q d+p gop of a building. One second later, ball B is dropped from the same building.4edgh gof9pz;( m+4 wq As time progresses, the difference in their speeds

  Two objects are thrown from t uyl6i+quec thw10s0gu20x)t. 6rhwphe top of a tall building. One is thrown up, and the otheqw y)ru p0ihhtuu w2e0xls616.+0tgcr is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the topg.5q+och k tkb7p42t v of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations ofcgk 4hpv2 +q7bo5 tt.k the two bricks.

  An object is moving with constant non-zero velocity in the +x axis:xn+dag* t6 gf. The position versus time graph of this object isg f:nd +x6gt*a

  An object is moving with constant non-zero acceleration in the +x axis. ,6wuo8qea bk5 The position versus time graph o8oqu e,b5aw6k f this object is

  An object is moving with constant non-zero velocity in the b rffvf2m+92 h+x axis. The velocity versus2hbmfffr2+ v9 time graph of this object is

  An object is moving with constant non-zero acceleration in ; jox pksu-u9*the +x axis. The velocity versus time gra; ou-j* 9sxupkph of this object is

  The slope of a position vers0mds71 i:pll jus time graph gives

  The slope of a velocity versus time t 60si58la bkcgraph gives

  The area under a curve 4*/icqz2p7:vw hc p7nm+ yj zdin an acceleration versus time graph gives

  The area under a curve in a velocity verg7 d**ocx z+zksus time graph gives

  If the position versus time /kg-gt ,kt1n yo ; yiecn7p*hyhjo5y 1-blm91 graph of an object is a horizontal line, the object i*yghk tbcotpnjhyin71oe5 l-9,gm - ky1y;1 /s

  If the position versus time graph of an object is a vertical line, the(q hz7dr742vh/xzkux object ishd 7/ zuzrv(q2x 7xkh4

  If the velocity versus time graph of an object is a horizontal line, the ob4tkc(5/ kcj b)j:tmaxject isktkxj(j:5a/c ) mb tc4

  If the velocity versus time graplgtu n) 8/t*bdh of an object is a straight line making an angle of 30 degrees with the time axis, the ut tldg*)n8b/object is

  An object moves 15.0 m northie*siyx54ubr 6 x9ex6z 1ua leyv e87) and then 11.0 m south. Find both the distance traveled and the magnitude of the disple ue z4x1xub s)* are8676ixl9iv5e yyacement vector.

  A boat can move at 30 km/h in still water. How lond lg yrvh27)m6u6fdm7 g will it take to move 12 km upstream in7mm6du6g dr y)7 hflv2 a river flowing 6.0 km/h?

  55 mi/h is how many m/s?zurv bwqnl 1*z/90p;g (1 mi = 1609 m)

  What must be your averagfkcz5+ nm+v,bc.hfn8v e/l p 9e speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximattw +r3;5dzy4 wc szvh8ely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s?dz yvh+w c58zt r4;s3w

  A car travels 90 km/h. How long does it take for it to travc(f7 u pr:zf*uel 400 km?

  A ly (light year) is the distance that light travels in one year. 3wz6 wbg.q2 hq0myv u. The speed of l m.qhy20 .6vbwugq3wzight 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 a:elbh zm 2t09ed-x.h nlong a straight road and you look to the side for 4.0 s, howmbh -2. edhnxet :9lz0 far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m)l 04:3ghp,axf,5-j jrh txjyb, in 100 s, your average velocity isl rja0-,xbgth:5jypfj h34, x

  A polar bear starts at the North Pole. It travels 1.0 km south, thw- ug kl6 i4(1 6mvff66feaemgen 1.0 km east, then 1.0 km north, then 1.0 km west to r46 wu1 flgkmme 66ffi g6a(v-eeturn 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, then 1.0 kx1rtk9/ywxn 8:g 6blhm east, t g/t9rb ynk h1lx8x:w6hen 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 velocity?

  You are driving home on a weekend from school at 55 mi/h for 1:yfqv,s9vy pnq .o*c210 miles. It then starts to snow and you slow to 35 mi/h. You arrive h ,9 v2vy:q.*ypcosnqf ome 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 av/yy m -bbx 7v/fu)t;yferage speed of the motorist 7m) xytvyfy/u- b/bf;for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is he6sb a,ptiopgr be8 u+78)4m ejr average speed ,e soemb bgu8j74rp 68 t)i+pafor the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 m3n30./xq z9e l, 1bmhxfotw e j8+bekti/h north for 750.lj /wn 9t8bxhtm 3qb1e 0keeozx,3+f miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 pg p6 i/expa, gvrkvo7x20iw4ik5 93v 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 the0k26 ggvvi9 vp i pax3/4,7oprxwkei5 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 9 s. The car's avera.z0/ omiy +jyzge velocity during deceleration was 54 km/h. What was thzim y o+z/j.y0e car's deceleration while slowing down?

  An airplane increases its speed from 100 m k 6izx;vqox)g(l2ptg sw47m :o(epf2/s to 160 m/s, at the average rate of gltv2mi p (xo2 :)geksqf6;4ozpx( 7w$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerat6mg x 90*euhb f0:x(uh9agzw des 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 ab2 -x4t,4c qs:)5 kn5un q sqgqe34jjp cjxf*tccelerates 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 spt76wxc5h m,v feeds up with a constant acceleratio, xh6wf7m5 vtcn 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 2.3 m/s experiezh)u.m6wj29bt 0u aqonces a constant acceleration of26 a0) quwhzumob .j9t $3.7 \; m/s^2$. What is the cart's displacement during the first 5.6 s of its motion?

  A bullet moving horizontally to the right (+x direo- ohd p7tb3, tp-sh.mmt8aemk .5;pection) with a speed of 457 m/s strikes a sandbag and penetrates a distance of 34.76 cm. What is the amb;tdomeah,t .-7 kh3me-t.p op5sp8 verage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane iflpw. *xh8sd jtz;v3 8kj.k1ps launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what ijht.xkw jzlp88 p fk3;*.s1dvs the length of the catapult?

  A car starting from rest moves e*kpczo9r9 n1y- z f/xwith 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/6 h pw.xpkzc-9)wnr4zs in a distance of 200 m. What is its average acce .h9cpw)4wnk z6 r-zxpleration?

  An object starts from rest and uuxx7mnh,-t5, vgd u .vndergoes uniform acceleration. During the first second it travels 1.2 m. How far willu,g uxnhmv.xvt5d 7-, it travel during the third second?

  An object is moving in a straight ;e qxu:wv,n9sline with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move duri:9 euv sqwx;,nng this time?

  A car starts from rest and accelerates unif/.syuo z*eqm4tvh * e:ormly 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 dr c abubf 0g+*qbr4w7 q:*(pbohy 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 tur2n2a*zgw )bhvt6(dp mns green, a car that has been waiting at the intersection starts ahead wita2 b)*hvmg6w dn 2(ptzh 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 planet X ./fesfed c4rd g,+z/m:) jt vcwhere the acce,d/ f r+dc)f.vmscgt:4 ej/e zleration 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 speed of 12 m/s on the surface of pw11blm(sz;j. n; qa tilanet X where the i(1; nj .atq zl1s;bmwacceleration 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 m * ouqo(d,gv r ih-,sz-o4tb8g57lbb X where the d4( l7mos*br5- bivhobgq,z8 tgo-u, 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 the surf7ced te w(4reh ny75:gi* ; :anyx-sa wfr4y,oace of planet X where the acceleration due to gra, -a d7hfri*aecwenwyeogtyyx(47 5s:;n4r: vity 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 howoxpl5 36vm8c d36s gclds a ruler between your f58 xodlc3p3gm66v cws ingers and 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 19.6x cfut523lo*t/ ppa wz y0c3v2 m/s. What is its velocity after 3.0 copu vw3z* pxf5y0tl2/t2ac30 s?

  A bullet shot straight up returns to its starting point in 8 s. Whatd fm9y+c p( .9cuap+aq is the initial speed of the bc9(um9 fap.+q+ pacydullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does ijvnb-:4+ne 1ofn nb5mh1ofb1gpk m* -t take to return to its st-bnm5+4jnf*1gn1oknpe b b1f hv:- moarting point?

  A ball is thrown downward from the top of a builw9ca;(x)s3hpfud ,/7ca4x dt j 5cbis(f2 rq vding with an initial speed of 22 m/s. It strikes the groun,iud 9x7(jcabfxsfcw3;p2q r() 4h t dsc/5vad after 4.7 s. How high is the building?

  A ball is thrown straight )8se mtxjm1r(0yt-c oup with a speed of 30 m/s. (only fill in numerical valujt(- t0o 8xmyc)e1msr e in 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 thi c76/54g d0;pgll jz :xkw(n eafn1t19jgffye air with a speed of 41.4 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity ybko2:0jn usx9(bu/ w+uy6 d mat t = 1.0 s?

  In Fig. below, what is the veloc(6vne2ayg3.ntfa gx w4:w 2qk ity at t = 2.5 s?

  In Fig. below, what is the velocity at t e(d(hch9fv 2c = 4.0 s?

  In Fig. below, what is lf600f,aceh3 1m +.pauruxj/qu9w d cerx 37jthe velocity at t = 5.5 s?

  In Fig. below, what i5 o , rmdm cuqct(nq elc;:bmiw9k62*4s the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6(j+spj9quu :zo;:wg9wn9xx l .0 s?

  In Fig. below, what is the accelerat0jhc1v a+muy(ak6p2 tion at 1.0 s?

  In Fig. below, what is the accelehn(5 ,yij(in wration at 3.0 s?

  In Fig. below, what is the average acceleratiok jbroo)q9eo1 +0lg7 ;jc yhx:n from 0 to 5.0 s?

  In Fig. below, what is the average acce )4; t (dnx:zg9hnozxxh,)yroleration from 0 to 8.0 s?

  In Fig. below, what is the displacement fr8n;5 uhhanuiv 1ot ou:-a8tz2 om 0 to 8.0 s?

Does a car speedometer measure spee-e- f,b7/, qzc oteu,bzw .tlud, velocity? {speed|velocity}

  An object can have a varying s(qy. lahhjnca,gse p8.qg2j 45ve +h6peed if its velocity is constant.

  The velocity of an object can be negative when its acceleration i 3xz8v-7ttefn s positive.

  If one object has a greater speed than a fb/,hxo.k go6second object, the first must have a greater acceleration.b 6g/ oohf,xk.

  Two cars emerge side by side from a tunnw;t7c:r w - aqbj6fpujmt a94*(ucfh( el. 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 acceleration decrease h8fzq l;m3zd*s.

  A baseball player hits a foult nzh7k5h2+b+)j dap ra() kyx ball straight up into the air. It leaves the bat with a speed of h+dhz+akap7b)n)(2t5yxjrk $120 \; km/h$. 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, wh/at.e6u4t75g t0j rxmdfs5irfw. wn *at is happening to its acceleration, how doix.td0nf w5./mj*ft eu5 wg 6rrt47saes it change if air friction is ignored?

  As a freely falling object speedw3)de ez ;r2rus up, what is happening to its acceleration, how does it change if air friction CAN NOT ;w3rre de)2zu be ignored?

  An object that is thrown vertically upward will return to its orig6;l5jn evmn *iinal position wit*m5e6 i; nvlnjh the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration aor9 ilw; 0-ad/+ncmext the same time.

  An object can have nonzero velocity and zero acceleratio* eac7p;o-+ ju*a m5k g2sam(hjjfq5ln at the same time.

  An elevator moving from the second floor to the fifth floor making no stopft )tmz q.qm++g7;uecb3)sc ss along the way has zero acceleration all the .)tctm)zfg 3ec; sq +bms7u q+time.

  A rolling ball moves i;zpx)a+z-z:c 0nz5j ,l owzqfrom $x_1=3.3 \mathrm{~cm}$ to $x_2=-4.8 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. 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 $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qu 22vqf zqko-.euuk(w2arter-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 trainer in a s94.nhnckz( p ztraight line, moving 90 m away in 10.3 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a)zc.hnn49k z (p 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 fromfx93e5zsn l 0po3v3xup; t 5dz $11 \; m/s$ to $25 \; m/s$ in 5.7 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 1vj)zye a(/ec $16 \; m/s$ to rest in a distance of 61 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sk1tkh+v2 j4 ;eu/gyh lpeed of $32 \; m/s$ 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 essentiall4cxki q go);j,9rfr,ey top speed abouj,g,)qcrie; 4r f9 okxt $10.8 \; m/s$ in the first 12.4 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 unif-/r2b*t0ndx pi+8aswkvur2 . ol3 jjtormly from a speed of $19 \; m/s$ to rest in 4.69 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 hwn,ays:+ty 0z ighway. Assuming ts yznwy:+,a0a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going-e9sxp(zo-q2rox6k dt. mh d-efo3i9 $25 \; m/s$ 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 igpa34gh/,z g-m0rc mg n less than 30.0 min. After exactly 27.0 min, there ac/r0gp 3ghm,ag z-m4g re 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?    $s$