Suppose that an object travels from one poj/9r+c ev(z gw9wm aq5: 9kchfint in space to another. Make a comparison between th j+:9ceg 9v q(59 w/afwczkhrme displacement and the distance traveled.

  When is the average velocity of an obwuj2(;rc(a yqrp :0u/kqk /npject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in we (m4j9ayd *azwpgc6 6b0w+f8 s". Thiy+6dfmw609zej cp*4 w(agba ws is a description of

  An object moving in the +x axis experiences an acceleration of 6:sdddd/ nh9z i2g- o siwvk 2xew).-u$2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow dobig .a.v -o)r5csothk h0i+9swn as it approaches a traffic light. Make a statement concerning its svo +i)grcah90.t. b 5-khoisacceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow d,x* hh2nlt f*xg*ax 4uown as it approaches a traffic light. Make a statement concern*h2a* f th* n,xul4xxging its acceleration.

  Suppose that an object is moving with a constant velocitpjsl+k,n,ie23vc ( hgxw sm 21y. Make a statement concerning its accelerwc,v2ek(,p hij3 +m2n xgsl1 sation.

  If the velocity of an object is zero, does it mean that the accelerati6 te61x vf5hecsj/q)con is zero? f c x)v6cht/5eesjq61 Support your answer with an example.

  Can an object's velocit td4q 5j7.ajn3v+j liby change direction when its acceleration is constant? Support your answer wit l.bj5j3 div4+ jq7ntah an example.

  Suppose that an object is moving with constant acceleration. Mak a4*y5gk-rlxjz ) m)bze a statement concerning its motion with respecz5)gmk-ay*4rl) xb jzt to time.

  Can an object have increasing speed while its acceleration is decreascfp1)- sf8z3 czmf,iu ing? Support your answer with an exaf,i f8zc)1pfu3 smz-cmple.

  Suppose a can, after an ini g* :egl.-obhntial kick, moves up along a smooth hill of ice. Make a statemenbgn:l. e* ho-gt concerning its acceleration.

  Under what condition is average velocity equal to the ,m*a nnkuhgfx4py8 i)bv ,/1s average of the object's initial and final f )kuh4 yv/psg1,m8n,x ibn*a velocity?

  Objects A and B both start at rest. 8qsf ca(:xkyl+b( 4jqfs 5 9dvThey both accelerate at the same rate. However, object A acce 98a( + yf:f 4jkxcs5vsdqblq(lerates 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 both accelerate at the same rate. xl: u)kpy,cw:7s xau( However, object A accelerates f 7l)sw:, yxu ua:c(kpxor 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 thx, slu;bt;8d7cf zxv7e absence of friction, which of the following is true l77,t bs u v;z8cxfxd;concerning its motion?

  When an object is released from rest and falls in the absence of fo ed9rq5 . ym0qq0:mzq(ylgr 2riction, which of the following is true concez5 o9qyl:0mqe20 d yrgmqr q(.rning its motion?

  Suppose a ball is thrown straight up. Make a staxcnw(4-g mf p0tement about the velocity and the acceleration when n0 gm-c4fw(x pthe ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration jus knp8k15ln1q ipm4xp6 t before it reaches i1ik8l m45p pnkxnq1 6pts highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to j26r,3doe b4 w f(cil j5/amosits initial height. Make a statemecmd25oil/jja4e f(,6sow r 3bnt 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 47c+ rmcfyfi ja484f0vmmxf(initial height. Make a statement about the direction of the velocity v (f4 xa4mf4mf+ri7cfcm 0j8yand acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistah)qe .ea r xd-k/a i 8/m i4usql.0(qv/kqla+ance. Make a statement . qx0 q)8./qk ad4kha+rqise a e-val/uiml(/concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wg; 4ot99 orp(/zkrzp. dxnn2what is her acceleration when she she reaches terminrk;94nw/pp (z.2n9odzrgt xoal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball is 8+byzvg4/lk b;)k4bjq6bbvythrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the sejk ygq;4yvl v8bbzb k4b )6b/+cond 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 kjx5y 93cw o8:capv-s B is dropped from thc-9p3 s:c axwj y5vk8oe same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second latervuo: ktq0e)9(pg2ctx c0h*q z, ball B is dropped from the same building. As time progresses, the pq:2e*0vo xh c9kt0z)u (tgqc difference in their speeds

  Two objects are thrown from the top of a tall buildinb hdg3:g 0h-bng. One is thrown up, and the other i3ghg:bb0dnh - s thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straigh8rmgn4+fjf s29l yb9dqat m06t down from the samel9d fg8t 02sab m6 mjy9r4fq+n building. 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 the +x axivw.fq 4)cog kq5aw 8b;a i:2ngs. The position versus iq nf; 5wg)v:c.bg24qaoka8 wtime graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The pje )7 ;vs eu,dqolx2c-osition versus time graph of this object dee,;v)qu l jso-2c 7xis

  An object is moving with constant non-zert 0+e30mpw ,najrfg ;2 okp/ixo velocity in the +x axis. The velocity versus time graph offtx2+ ar;wnp ,3mo/0 pkj0gie this object is

  An object is moving with constant non-zero accel lcs0n)*- r kof6e(kmjeration in the +x axis. The velocity versus r6k se-(nkc )0fjm* lotime graph of this object is

  The slope of a position versus time dg l g(k,vsp;g3 5y(o:ufe2tugraph gives

  The slope of a velocity versus tiaf4uy5)xz s)wq d*cv l;a:n-uc ;:c. czm2kfy me graph gives

  The area under a curve in an acceleration versus eoso1d: aq * 8vvuld6:time graph gives

  The area under a curve in a velocity vxt woj*b a )v6s+cdp m/g6i4i7ersus time graph gives

  If the position versus time graph of anfsx no00rq,1r object is a horizontal line, the object is10s0ofx,qn rr

  If the position versus time grap5ko u;lag5 g 8qh9 )phx2:)qtmsz .lboi8*upsh of an object is a vertical line, the object is s2z hb;qh itkqus p *xaug.8)mo9 5pl:5glo8)

  If the velocity versus time graph of an object is a horizontal lbl4* mfnfew u /mv6--r ,vgjc:ine, the object isuvv6c,4f nl-:fe wjm b*/rgm-

  If the velocity versus time graphjkz3ev kkt7.5 of an object is a straight line making an angle of 30 degrees with the time atvk3kj7ek .z 5xis, the object is

  An object moves 15.0 m north and then 11.0 m south. ;ap+4sk g+i)-dbjq sp Find both the distance traveled and the magnitude of thes ;si+qg k)4ap-j+dbp displacement vector.

  A boat can move at 30 km/h in still water. How long will it take toyfh j4)k5 hu+b move 12 km upstream in a river )+ hb5fjky4 huflowing 6.0 km/h?

  55 mi/h is how many m y gxdi0k0:6pn/s? (1 mi = 1609 m)

  What must be your average s0oc2)w1 kicwmpeed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) i25cq *dknaee(n 2 hours and 57 min. What is the ad2*ke(q ec5naverage speed of the runner in m/s?

  A car travels 90 km/h. How long dolnmj hq 3k(hh6eh.+ /kq0ypw)es it take for it to travel 400 km?

  A ly (light year) is the distanceuo -ua *61vvpe that light travels in one year. The speed of lighv1 ae u-up6v*ot 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 rox u(;w wy7;t(lh*l dvpm j-cq9ad and you look to the side for 4.0 s, how far do you travel during this i; h;xv(-p*tqll d7wm9w(cujy nattentive period?

  If you run a complete loop around an outdoor track (400 m), in 10,t(lp5ml, i6kss5rw m0 s, your average velocit tik5(5s srl,6mw,mlpy is

  A polar bear starts at the North Pole. Itm, / ,pjul 2ifi8f ,t0njcx5sk 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 waxj mci/ i8t05fuk fs,,lpn ,j2s the bear's average speed?

  A polar bear starts -1x,klk* mrofec h,x)d jd 25-zsepp.at the North 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. Thisz,,1rl2- p- fm eodhke.xpd)xjc5 k*s trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at nm94 cynp)lv j g1//rk55 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 sy1)4/cmp/nvj rkg l9nchool?

  A motorist travels 160 km at 80 km/h and 160 kk0z0ye/roait80ox (s m at 100 km/h. What is the average speed of oo0e x8rz(/s iy00akt the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2l3ivsf0.t y) o.0 h at 100 km/h. What is her average spe )if lys0v3.oted for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/hgb4mpo 8)3pp82rqjet north for 750 miles. Whtbr8pjgpq 23e) 4mp8oat is the average speed for the trip?

  In a 400-m relay race the anc6z(dz3zj d4awvyv1fu*rqo*9 horman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can co3 ydov *avdzwzfur6(j*4 q1z9 ver 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 and co-* b5a 0uvno( h.gcadnufz 0/rmes to a stop after 11 s. The car's average velocity during deceleration was 56 km/h. What was the car's deceleration while slowing d *ura5nfvzg. (hu-cnd/ ab00o own?

  An airplane increases its speed from 100 m/s to 1608w4tjwhq e)gk840 no8sie -jmzey .1n;k *eeu m/s, at the average rate of s*eq jjey8kk. e iwm 8w) n-h18uzo t;4e4nge0$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acbeqq( 4ub f6(+khuhu6 celerates 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 restn eu9, v61y4 alijpr,s and accelerates 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 i;ol8i,2pnu )ydzj*u s. It then speeds up with a constant acceleration ofu8i2d;uz)y,n i*jp lo $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.6 m/s experiences a constant)zn,yt*g mu ;lq7u/hs acceleration of h;gt*y) ln7 z/musqu, $4.5 \; m/s^2$. What is the cart's displacement during the first 4.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 204 m/s 2se.,fkb(yqj strikes a sandbag and penetrates a e,.(kqbj yf2sdistance of 39.74 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 rkp.evz kru,/k np1; 4zu6hw g4eaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, whatgukukp;rz6w,44 pk ne/1z hv. is the length of the catapult?

  A car starting from rest moves with constant hmai3(pm-vbg1ho3di ms6 slh;0 hf87acceleration 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/v-m m2r rluf :yb:t/g9wz (u bo9q.l.wac;v c7s in a distance of 200 m. What is its average acceleratumr-v:w lcw yqfg7rb .9o b 2lu/cmzvt (a;.:9ion?

  An object starts from rest and undergoes uniform acceleration. During hlw +lze,; ei9the first second it travels he,zl; i9we+l 1.3 m. How far will it travel during the third second?

  An object is moving in a straight line n md/il65rbhiry 9k:t (k0 y*uwith constant acceleration. Initially it is traveling at 16 m/l9 dmhki n/ b0ry y(*tu5i:r6ks. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accf 7ryh+wp1 cku fat4)7elerates 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:i l18g8 jyfy; irnqsrwy968r 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 c0:u66z1 0 jmzfraq4 miplm9ccar that has been waiting at the intersection starts a6f q4ujc900c pz lmam izm:6r1head 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 theqx 28op)mcpf : surface of planet X where the acco)p pc8q2 fm:xeleration 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 speeg0xylj2tn 7;0c o qs(wd of 12 m/s on the surface of planet X wher (j0 wl2ngq;oty0cxs7e the acceleration 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 4opc4evo 88pj where the accelerati p4o4jv o8pec8on 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 s5whcy(d hvj.as6i)e7 peed of 14 m/s on the surface of planet X where the acceleration due toy ) i.sc va(75hjd6weh 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 )not p3 p7*2) rrfr x ;iv n+6ocivg./njt7xkps. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ru+6.po* n;prfk)/ ixnj2 )or7 gr3 tvncx7vitpler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What ; n/+jn:gukdl is its velocity after 3.00 jg n;l u+n/:dks?

  A bullet shot straighy4 r:3mmwku g +gmej+1, tvu:ft up returns to its starting point in 10 s. What is the inim+ ,gm4: +1f3u jekvw:uymt grtial speed of the bullet?

  A ball is thrown straight up with a speed 9; ku7hf18.jzu d6evn d ucm 0m-toh2(vewl t7of 36.0 m/s. How long does it take to return t7 k dfzvw nt90e2ue6vh u7hodm c(ut.8 mj;1l-o its starting point?

  A ball is thrown down212cz e7bmbvoy;m)ny d4*cw zward from the top of a building with an initial speed of 21 m/s. It strikes the gromw42b;m e7y2d )oczzbv *1 cnyund after 3.3 s. How high is the building?

  A ball is thrown straight up with a w)bdg i4l/,o zspeed of 30 m/s. (only fill in numerical value in the blanks4bdi ,ogz)l/w)
(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 s/x t kvqun5jj)r./s8p/uee1b traight up into the air with a speed of 24.3 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 1 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 the velocity at t = 1.0 y8)mp0lkp tmd23 df tlfg6nfg7 6 h7k;s?

  In Fig. below, what is the velocity at t = 2.5 su9lh,;hyc;cga*- -lh t qiqv;?

  In Fig. below, what is the velocity at ukz)tf:6;.9mnmqt+w is id i-8zm9pv t = 4.0 s?

  In Fig. below, what is the ve;57r o/e clrrh( yq)cwlocity at t = 5.5 s?

  In Fig. below, what is the average vel oqc g,1.mh)jd9-s rorocity from 0 to 4.0 s?

  In Fig. below, what is the averajb0(1rtwjdq4ia/kff di8 ;g* ge velocity from 0 to 6.0 s?

  In Fig. below, what is the a( c hswan:o,x -6fjk,acceleration at 1.0 s?

  In Fig. below, what prm:89w 3m ngcis the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.)ssebdulxyyy/ dh( ki+s/nba8 ,;+3 l 0 s?

  In Fig. below, what is the averwwho *r, sv95vd5y x a)bscujb4vd*4, age acceleration from 0 to 8.0 s?

  In Fig. below, what is the displm+tf 45 m)c6bmzc4 md8bssaj ;f:/ovwacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity :,l852yp;vxudan.xcwrq3 j e? {speed|velocity}

  An object can have a varying spefmg pgl5h2b)0g9* s8jat do/med if its velocity is constant.

  The velocity of an object can be negative when its acceleration is positi-9 iesicfeuy6,(o. -oziah4 ive.

  If one object has a greater speed tha18 pz zx;j;gman a second object, the first must have a greatemg ;zajz 1p8x;r acceleration.

  Two cars emerge side by side from q3z6 y5oqw eb;9+it zwa 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 in speed as its acceleratitg) othxipzr. z4(q 54g5m mq(on decreases.

  A baseball player hits a bf1e cax 7(5yyfoul ball straight up into the air. It leaves the bat with a speede yx5ba7fyc (1 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 hh/ up5j36 p;i t0spjqpappening to its acceleration, how h ji 3t0p6p5sp/u q;pjdoes it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its l08z/zrm ,hr1 vbmu0d wk my;yr(b97qacceleration, how does it changeumv rhb00 z y8zyl(9mb dr1kr/7m;w,q if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original posrah.+ yn g*d *ee.nxr/znro0 cudl c8u1h+4 *vition with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, hgvl ur*dra.h c1 84neuh0cr+zy +e.d/o*x *n now will this result be altered?

  An object can have zero velocity and nonzero acceleration at the h.qa mm(irr+ l2q2a a-same time.

  An object can have nonzero velocity and zer u4ko(n *0:.guwbl( ialvl*(zi6 da bmo acceleration at the same time.

  An elevator moving from the second flmu d:4a:zmexqt:i:9 wqj -je;oor to the fifth floor making no stops along the way has zuimeatqm9wz :q:xdjje 4;::-ero acceleration all the time.

  A rolling ball moves from xfw;ux0e0lc))0v tnc $x_1=3.3 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comhf jmf;-5+hqte ykd:7uq 7v. splete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.1 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 6prw 7l;9v:xs /6l hrhpqsi4q, moving 95 m away in 10.2 s. It then turns abruptly an/qlr6pv;4hw:hsp9il 6 r sqx7 d gallops 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 fromlpj.;5vo tj yytal*1,-b, t )wm7i qjf $13 \; m/s$ to $22 \; m/s$ in 5.4 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 pinjs rcp-v aq6pots --(-7 +v$22 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reapt q auy)ht;m2vn;5 k1bs s.o*ch a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essewdwx /jna71,p 8n x61ouoxew 0ntially top speed about 1uodxwxwwx j p8n/ 7aoen061, $10.8 \; m/s$ in the first 11.0 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 sy 1+6qr tklx3mpeed of $20 \; m/s$ to rest in 5.36 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mam ar 04gn1 fh(*xmxgjn,1b+y zrks 92 m long on the highway. Assuming a decehyfan*gxnxm4 r(0 bjg1 m,1z+leration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin d6zv v86 jljnts85+talnf0qdr- u06 yg $25 \; m/s$ 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 t;rj0 tpi31x cuhan 30.0 min. After exactly 27.0 min, there are still 1100 m to go. T;cux 1rti3 j0phe runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$