Suppose that an object travels from one point in space to anesdldai :s-1o1n : +12wab kfnother. Make a comparison between the displacement and dasen nkw:-21o bisd+la:1f 1 the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocit p/flep )uerz oc(k, (vbxjhtt.4z+ )1y?

  A new car manufacturer advertisr sw2ida9 x h2,nspj59es that their car can go "from zero to sixty in 8 s". T9,x5j 2rs9i 2da phnwshis is a description of

  An object moving in the +x axis experiences an 73( d*x hjbrnn;keod7acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directioe ut3w96l)n z5avsyw+n) begins to slow down as it approaches a traffic light. Make a statement concerning its accelu+wynvts )9ale3w5 6zeration.

  Suppose that a car traveling to the West (-x direction) begins to slack i pnsd;7s*83 jr4eow down as it approaches a traffic light. Make a statement concerning its accekp3rce*sj ; 8is dan74leration.

  Suppose that an object is moving with a constant fn02n z)tc)xy velocity. Make a statement concerning)02xn)cnf zyt its acceleration.

  If the velocity of an object is zmip7 upvv5 l1)f peq*2ero, does it mean that the acceleration is zero? Support your answim7 ppp2f*v)e1v lq5u er with an example.

  Can an object's velocity change direction when its accky/:tvd xkk4j ;80 fqheleration is constant? Support your answj/:yfhqk dk;x4 tk v08er with an example.

  Suppose that an object is moving with constant acceleration. Make3 or 7edcsdu8q1 qgv0- a statement sd rq8vqg1od- ec73u0 concerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? p vm0 ycag .(,ub7-xai a2a4wqSupport your answermug0 - c y47axqp .wav,b2i(aa with an example.

  Suppose a can, after an initial kick, moves up along alc rq4(o3(d yj smooth hill of ice. Make a statement concerningqoy ((j3r cdl4 its acceleration.

  Under what condition is average velocity equal to the average of the p6na1dso 8f4vobject's initial and fi da486vfnso1 pnal velocity?

  Objects A and B both start at ro.p2,hd ygwl v4:d2 f++ lvwvtest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compalwhgov.,4+y :dvw+ 2 tlp vd2fred to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. H h:tfv. hfi- w-z7zbk+owz-zh-wf t: khv+i.fb7ever, object A accelerates 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 ivvde qy244+ yxn the absence of friction, which of the followi2 +4yvd4qyxveng is true concerning its motion?

  When an object is released from rest and falls in the a(m fe4ufx;h5obsence of friction, which of the following is true concerning its xhf4e;o5(ufm motion?

  Suppose a ball is thrown straight up. Ma78f f n ,48u8eetuvxjdke a statement about the velocity and the acceleration when the balffux ue,88 dnt4e vj78l reaches the highest point.

  Suppose a ball is throeo.xgypp bc rmd4q 7- 8-;bz5nwn straight up. What is its acceleration just before it reachesmbp.gpc-;qed75xr4 o 8 z bn-y its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, the75+kzl (seh 6kvu 5itz px:7fgn falls to its initial height. Make a statement about the direction of the veloczs7(+u l :pfkvz5itx675h kge ity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, thenu,h7n 0 uo gsgyv:fpx*4-q2ij falls to its initial height. Make a statement about the directio:xn4yos j0 fhgupvu7*-gi,q 2n of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a 9l1 r ypxcms 7pcyg((5wm9l.y statement concerning its accele pyc.59cl1grpl( 97 mysm wx(yration.

  Suppose a skydiver jumps from a high-flying plane. What is 9yb mn;+zlo5 oher acceleration when sn+oo zb5y9 lm;he she reaches terminal velocity?

  A ball is thrown vertically u3kkkcjxn1v 5/u5 g8:rj5 ;q4sw wuepqpward with a speed 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 u5qcr wkvk;g85 1qjj/ns:34ewxkp5u 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 secondrx5- 4*leiba5t a j5cw later, ball B is dropped from the same building. As time progresses, the distance between tt4awe*5-jb 5alri5 xchem

  Ball A is dropped from the top of a b -5sg+q(yta;z kc (cm/-ei lqyuilding. One second later, ball B is dropped from the same building. As zyi+c myta-kqq/ (g -csle;5(time progresses, the difference in their speeds

  Two objects are thrown from the top of a t:b l4;o ppi(pghn /*qqm9qy4m all building. One is thrown up, and the othb/lnpio: 4pqmp g ;*9 (q4hymqer is 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 5uye9cbw84 vzmw+rfr6 mrry.8r 7,efbrick is thrown straight down from the mrf +m5zy ,y6 .cb wwe489rru 7ver8frsame building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving s4x gx rc7g9)9fnb3uyu :z9*gm lk1vnwith constant non-zero velocity in the +x axis. The position versus time graph of this object 3xn7r9u*n m)f:ugx99vs4gyck b z g1lis

  An object is moving w nu8.) jn;a2kvbx) qjhuw6-db ith constant non-zero acceleration in the +x axis. The positio-)bvx;kna )j6uwd. n q8j2buhn versus time graph of this object is

  An object is moving withbic h.cibm1;4 constant non-zero velocity in the +x axis. The velocity versus time graph mci;bc.1ib h4 of this object is

  An object is moving with constant non-zer9be g )qeci m3.mvug(3o acceleration in the +x axis. The velocity versus time gq9e)b. 3 igu(gemcv3m raph of this object is

  The slope of a position versus time graph gi ) ws;. m3,swcfhppp2rves

  The slope of a velocity versus time gra * :to-2qkb obpmb4k/fzx12paph gives

  The area under a curve in an acceleration versus ti4xzy ( ck98svvc)ze :sr -0vgpme graph gives

  The area under a curve in a ve9-ffvx8a53wg -gjwn clocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the ob)5 p 6lfkjrn+cb*urp/ject is+ )cr65p/pbkn r*jful

  If the position versus time graph of an object is a vertical lin1b8 a .*cn0h v7ayf ba7z4ciiqe, the object is4hb0cqfiy 7a v*17i8n aa czb.

  If the velocity versus time graph of anyu s;ijza**vi; l(fa3 object is a horizontal line, the object iaiv3l* u as* ;y(;zjfis

  If the velocity versus time graph of an object is a i na 9(i; u6cc/yotc0kstraight line making an angle of 30 degrees wit i;6tackc/iu(co09ynh the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distancelv21 j o0v8;b;ydlhtr traveled anldr1;v02b ;vj thl 8oyd the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to mdf.eh* 4g+;tzp7xl grho ; 5frn/o1lsove 12 km upstream in a river flo+ *h o rh4fged;/p1nz5;trf.sg7 oxllwing 6.0 km/h?

  55 mi/h is how many m/s?b2wt 4uh2 ;ktyxekj +/ (1 mi = 1609 m)

  What must be your average speed in ou,t4r8 pwtvbz84z bh xfdk 8;3rder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What iu4 li:2klpz v8mg vwq847tg0ss the average speed 0i qw2mk8pvg l44 lgt:uvzs78of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400kwq y( dimlr2:fg5 8) 2+ejsiv km?

  A ly (light year) is the distance that light travels in one year.lnk:usd/--w 7 mc0lvf h)foon,9 +af 0csvjr. The speed of light isv7 l0r f -9. uvno )a/hn,sm dcfskj+of-l:w0c $3.00 \times 10^8 \; m/s$. 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 str0z ec*3,jvvqv.w h; tbaight road and you look to the side for 4.0 s, how far do you traveecwtj* vbv. v0z,;h3q l during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in qk1-j.2 f2w mpgmchd8100 s, your averagwq cgdp.h8-2 f k2jm1me velocity is

  A polar bear starts at the North Pole. It tq1n2szye+(0vf1(;gqg5;km(rf cs q u/ zc ibe ravels 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 was the bear's average spevg s+/f e geu5q ;yzf1s(c in;2k 0z((mbc1qrqed?

  A polar bear starts at the North Pol8.x.i )olwblvj i x6-me. 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 t8. bi ixw -l6j.v)mxloakes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from s+3kku tmno99 fchool at 55 mi/h for 110 miles. It then starts to snow and you slow to9km+9konuf3 t 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 8u;w v8unslagy( wa.8and 160 km at 100 km/h. What is the average s w(g;wn8 .8yuasv a8ulpeed of the motorist for this trip?

  A motorist travels for 3bt62v 6:yk8ky: 1mnf y-8i t5ayoznbf.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for t y5 z6: kynki6 otm: v8tn1yb2a-ybf8fhe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fxzi7(sdh , 8h:bqdqa5or 750 miles. Whdsq(xb:a d8h,hziq5 7at is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the l9pxo je-/j)viq -dnx.5ni:x b:ju2 kzast 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 cx oj n 9.)jviu-knqe-5i pbzx:x/dj2 :an 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 stgy+y.g b8l0qwop after 10 s. The car's average velocity during deceleration was 49 km/h. What was y.l g0q8gw+yb the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averog cwm m+6m1il +ji*2gage rate of i+gl m2cmim6 +w1j* og$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h ax5ikkg vz-fd3 8 hrm)wc1rq-m9b rw/ ,ccelerates 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 reefhfv7hq,4t5ggs jq: f0.p3x st 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 s. It then speeds up with a constant acjq2ri64sc m2jy jh)o 2celeration of )yc4q26hijm js 22 ojr$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.7 m/s experiences ay2)zv cywp8yvvmijy )14y+ 1y constant acceleration of11y y)v )m y 2+ipcv4yvyw8zyj $4.0 \; m/s^2$. What is the cart's displacement during the first 8.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 407zzqv2 d5 8)*4hb2, ) ynylk7cfdytl lp m/s strikes a sandbag and penetrates a distance of 43.79 cm.yfc2q28zh7, kply )5 zlnby d4)*dlvt What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft car3 9c71tq eqesvrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 7vec19tse q3q 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with cons ti)nl7 g .dqrgp)2.:s(xbpwrtant 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 u:duxh -f3 e3pvp* f1/x (w*uy+pwfd w80 m/s in a distance of 200 m. What is its average acce1xuf/xd*vp:*fwpy+p uw3ud 3e h wf(-leration?

  An object starts from rest and undergoes uni zdg,-feus9hci+3l n,form acceleration. During the first second it travels 3.3 m. How far will it travel durzdulih,f +e3ncs9 -g,ing the third second?

  An object is moving in a straight line with obx4hi(p: )tl:3udk jconstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 ) :hxkb t(u:jpoi4 ld3m/s. How far does it move during this time?

  A car starts from rest and acc e0af+v,t,bmuj2h eoj3 .si4bg 4ym6relerates 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 road can d7tkbpx63a bvvhfzd:x0p :p8 0ecelerate 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 bwj8g*h,uf.fu.cg9czoio np j*gi- 30een waiting at the intersection starts ahead with a cong3 *fof-c gjz8 ,jpwn. .9g cu0i*uihostant 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 q8kl q/llspvm; f///tX where the acceler/v/qlq l; pfmts /8/lkation 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 3x 5 vjxb+d,ub 5s def--iteo9the surface of planet X where the acceleration due to gravity is5e39- +-i obv uxeb,xs5fjtdd $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward wiooi/54d ,e(3y(t 1qhdniuzp7 l.l x/ lcm1gcuth a speed of 15 m/s on the surface of planet X where the acc17ni z.e(qi golp5 ,ycodu/ ct/(u3 xh14llmd eleration 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 ofm+ ij)kt f/y+4dpdf a2 14 m/s on the surface of planet X where the acceleration due to gravity iskt+p4) a2dym j/+if df $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usua-uj d5o /hj))acu ivno.4k2tolly greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you cakah o-2j/ou.ut )nc4o djv)5itch it?

  A ball is thrown upward at a velocity of 19.6 m/s. 9vmp,-u59dzgm jmy 8xs)n y9v What is its velocity after 3.00 s?m m j8px9dv)-ysuyngv5zm,9 9

  A bullet shot straigh4be twruuon c3 s46b+)t up returns to its starting point in 7 s. What is the initia6u b tn)3wc+4u4esbrol speed of the bullet?

  A ball is thrown straight up with a speon :woy- dgy*hahh6+g rz910 sed of 36.0 m/s. How long does it take to return to its starting poi -hgzy61d+a:ho*nosr y0wg h9nt?

  A ball is thrown downward from the top of a building witl/. ui6edbbhts3x i1j3q7nr/r 1z7v bh an initial speed of 11 m/s. It/.r biu/rt7 6v ld nj1xzs q7b3eb3i1h strikes the ground after 5.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s.cv41:bfv48 mbcft 5 pcwdrj -2 (only fill in numerical val:d cfcfvjb4 bp4twvrmc5 1 2-8ue 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 the air with a speed of 28.7*p8gp-x5 *)k zssmm/n bhhj(t 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 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 the velocity at t ):ud6 k 5r77busfqyme d,vbb 5= 1.0 s?

  In Fig. below, what is the velocity al)q, +6l dx,lrbham2tt t = 2.5 s?

  In Fig. below, what is5tcyh- u;as w/z- 0ewo the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5n2p01ox)-pw2tb+ ,armz cj.pwu f xn0 s?

  In Fig. below, what li n6f7cr-y6z is the average velocity from 0 to 4.0 s?

  In Fig. below, what tzo6e3svtqg szy5q k:.( d68 fis the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratio fy66v0qyen cbi* r;d.wgo s25n at 1.0 s?

  In Fig. below, what 8bj,jqkmth 56rmx/ 4ok;fc+ fis the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to pu ef-f o6 4redr.4b2 i)bp1yb5.0 s?

  In Fig. below, what is the average acceleratio*j- 7cmc wjyf9,o0uwss nq))wn from 0 to 8.0 s?

  In Fig. below, what is the displacement froe qxblp/rjg2mj6/ *4h m 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitellf; yz( m 7z0n jt;)l0.pialy}

  An object can have a varying speed if its velocity i 63cf h)wmv9bqs constant.

  The velocity of an object can be negative when its acceleration is positiv2xip **ojj5izx(v( f be.

  If one object has a greater speed than a sey9*, e10ktar jyi(nd wcond object, the first must have a greater accelerattjed a y( w,i*kr9ny10ion.

  Two cars emerge side by sin2ue+a7b vef -pqsus 4 3dp,7:e8ggj;e* rqd wde from a tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed as its accelq fo*4bsm8 mq,eration decreases.

  A baseball player hits a foul ball st; 5vuur) ;ci x-ou*kvoraight up into the air. It leaves the bat with a speukru-; vu);5oxci* ov ed 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 happe mzb*e4)+nm6brz fr 7fning to its acceleration, how does it change if air f em* )fm6nrr7 zbb+fz4riction is ignored?

  As a freely falling object speeds up, what is happening tota33v*8 u06 v:xtpt dcdbhl wn12b (gm its acceleration, how does it chdb1 338tavt u6(*pvnxgwl dhb0:m2ct ange if air friction CAN NOT be ignored?

  An object that is thrown vertically upwardvw.1e racx+4buoy 9s3 will return to its original position with the same speed as it had initially if air resisoyc3er.4 xu1wav9 b+ stance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero adwo n (-igf)0hcceleration at the same time.

  An object can have nonzero velocity and zero acc7r ubrc;t*z d0eleration at the same time.

  An elevator moving from the second floor to the fifthbohu) 9gqms 3x-v110wh cgy 0m floor making no stops along the way has zero acceleration all the tim0 gc19u1sgxqbyo0)-v h3h mmw e.

  A rolling ball moves f6 jrj5vk;9k/r.b 7y cdv*lhadrom $x_1=2.8 \mathrm{~cm}$ to $x_2=-4.6 \mathrm{~cm}$ 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 $t_1=-4.4 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete *jj dzoq yiwlm h8/z0w8y59iy x3)l9nlaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.2 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 straight line, moving i)cgx0u+nu5 zqv( l ngp;h4y5 99 m away in 11.5 s. It then turns abruptly and gallop5u (gzi )0qn4ycv;hg u+ x5pnls halfway back in 4.6 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 froqjoix-pm+90rmkg : 1fm $12 \; m/s$ to $23 \; m/s$ in 5.9 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down from/o45klc w++q:mxy nya $19 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach all86qn-s, yxx ( nb1t za35ftp speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially toff83t0; dk-tu d97gnixy9lm ap speed about n9fk t3fluxd08g9im 7;- tyad $10.9 \; m/s$ in the first 14.4 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 unikp7m n0uw3vh 2formly from a speed of $18 \; m/s$ to rest in 4.61 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 qttzv x/,al 6:ao5zq-r 0wpa *on the highway. Assuming a deceleratiaq q50oxlzt ,: wz*ap t/v-r6aon of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin* :mir3hp ka, z1unw0hg $25 \; m/s$ 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 10,0 z z.up5iw66fo-m;um p00-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runn- 5wo6pumz .6mfpzu;ier must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$