Suppose that an object travels from one point in space to another. + -r li:j5 :x8m 4hrnf3ohihb6brjo0 s Make a comparison between+ 3hlrjhf o05i::i bj mb6r-h84x orns the displacement and the distance traveled.

  When is the average vel b+0(u f;maaq778/peqnf r rbgocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that u pkwcyd (4sx y j)ql c+xxkip/p86c8+2vw )-xtheir car can go "from zero to sixty in 8 s". This is a descril6xj(pykx8 2s xi 8 yw kpuvc/d)x)q w-p+4cc+ption of

  An object moving in the +x axis 3*;oww i*nhaoexperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x.zu*fj :f *itc direction) begins to slow down as it approaches a traffic light. Make a statement concerciz:*fu tjf*.ning its acceleration.

  Suppose that a car travelnn.5zvjjos7+b9ain)r oh 9 (d ing to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its j hor7)vsoai n9 j(n+.d5nzb9acceleration.

  Suppose that an object is moving with a constant vepny7d(ijp fqmi*6*)u c8*neb locity. Make a statement conce8f*enbpmi76u* ) qc j*dnp(yirning its acceleration.

  If the velocity of an odclsyt i vu+n,r3w.46yod 63j .w u(nqbject is zero, does it mean that the acceleration is zero? Suppor6.d t wrn3iv+3uowdusnq4y,(.c y lj6t your answer with an example.

  Can an object's velocity change direction when its accelera 33nm+ex8xxtci)m3 edtion is constant? Support your answer with an exampleent38m xi3 x3c +)xemd.

  Suppose that an object is moving with constant accelert(won,5ay+k rpj d9;3:v kiri32uugyation. Make a statement concerning its krtigy d +w aio 2n53(pr3;kv:juuy,9motion with respect to time.

  Can an object have increasing speed while its6ru,yuxg5d 8dbo x d )9o2i:sa acceleration is decreasing? Support your answer with an exab adouyou8x2x ,id s9r 6:dg)5mple.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.s5*qnbrj*r fb-yl m)/ snny6) Make a statement concer j yn)syfb5)r/ nsmlqb6*-* rnning its acceleration.

  Under what condition is average vel+cs87rw*,d fk2*pzx36 s onep u0lskxocity equal to the average of the object's initia* pexc2 sko37f*lz0ux8+s, r ndsw p6kl and final velocity?

  Objects A and B both start at rest. They both accelerate at5m5sb-()wjf mv49g( hooqi un the same rate. However, object A accelerates for twice the time as object B. What is the 5( b4o9)gni f smom -w5ujhvq(final speed of object A compared to that of object B?

  Objects A and B both start from rest7 r:rjx3yk1b y. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B:3r7 xy1jkyrb?

  When an object is released from rest and fallq 98v/ vov/+omuydw .js in the absence of friction, which of the following is true cov9v ouv8/ m/ .qodw+jyncerning its motion?

  When an object is released from rest and falls in the 2x1:e*we-:)tt7 z k8zzm htdzl3jvxm absence of friction, which of the ftx31h)zezjd-m 7e2 kvzz t:xl: w*m 8tollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Makeuoa2x2)f u1o1e uk/pu a statement about the velocity and the acceleratiox2pu /1u ok2oefuu1a)n when the ball reaches the highest point.

  Suppose a ball is thrown straight;2p0 ik 3cgxqz up. What is its acceleration just before it rexq3g0czp ki 2;aches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then,+se 4gjuaanzh/m labsf6. n,* 5k(iw falls to its initial height. Make a sta5.lj+/k*iha, aseb z(6nn, 4 fgswuam tement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, r6hd r7ff gqy2*eaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocityfh6q*7f ryd 2g and acceleration as the ball is coming down.

  Suppose a ball is thrown daj8 whre6t.p++wj a2 /jxm9cgownward in the absence of air resistance. Make a statement concee8j.m9g whj rp6jcwt2a/+ a x+rning its acceleration.

  Suppose a skydiver jumps from a high-flying planig0 q u6odh/,rz9x6ak1aq7bt e. What is her acceleration when she ik0 gz1 o7u6a9qtbr ,qh/dx6ashe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bali )fj*vhrr:z4 l 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 second ball go than trj:f vhr 4*)zihe first ball?)

  Ball A is dropped from the top of a bui6tm i.dvg+y x6(+qgqb5b wd0y lding. One second later, ball B is dropped from the same building. +b(g.dtg6m qbiyw5 xdvy6q0+As time progresses, the distance between them

  Ball A is dropped fro3dmph*xg*bs 7 m the top of a building. One second later, ball B is dropped f m hg3x7d*sp*brom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and7yn0 hkte)ow- t-n0t) 7woykhehe other 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 secoz;ghdtrk/rz)yb8 -nqxj s.i91j7s8 x nd brick is thrown straight down from the same rkz-1;yj9h)8r djxt bizs7q.x n/s8g 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 axis.1.,w)osfx c ct The position versus time graph of this obj of)1sw .xtcc,ect is

  An object is moving with constant non-zero acceleration in the +x axis. The ja2p27 idoz4lf kq51 o0ag fb3position versus time graph of this objeo pk125 lz7bdi2 4affqao j0g3ct is

  An object is moving with constant nonm. 0 ;t,imx,1tnssc* sw kk3: mwd.cgh-zero velocity in the +x axis. The velocity versus time graph of this object iss.0mim:t g3m *d 1ws;w,hckxsckn t .,

  An object is moving with constant non-zero a0+*io0e h qdbdcceleration in the +x axis. The velocity versus time graph of thdh*ei00dq+b o is object is

  The slope of a position versus time graph gisgbic1j le,;*ves

  The slope of a velocitek1s+ e2m5kuxl 7p:g)chc5kg y versus time graph gives

  The area under a curve in an acceleration vernrot3zho.8 t glqnd l;fq(,34sus time graph gives

  The area under a curve in a velocity versus time graphszhzzt. 8vv 0-.g +jdp gives

  If the position versus time graph of an object is amn1zv 7culbsj(.bm ct+iz*gz *.l9 1o horizontal line, the object i + lznbc1z s(u.ic1zg* joml7 *v9bmt.s

  If the position versus time graph of an object is a vertical linf5ibfu +z4av 2e, the object iszv+52fauib4 f

  If the velocity versus time graph of an object iqw8aop*1 4bkn )i yo6ks a horizontal line, the object ioo6*qkipyb )n4 w18aks

  If the velocity versus time graph of an objen mb*,v lr0ppt0 h:u5k2ur9wv*vyg( ;n:u xsect is a straight line making an angle of 30 degrees witvrusmkxvlng (eb:*u 0*npy25; 9 ,vuprt:w0h h the time axis, the object is

  An object moves 15.0 m north and then xkorv;3 )e6ad11.0 m south. Find both the distance travelev6 doxa) r3;ked and the magnitude of the displacement vector.

  A boat can move at 30 km/h in sti)dj3*xuap z3wll water. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?jza u)x p3d*3w

  55 mi/h is how many m/s? (1 mi = (0bf7w : s,e czsnp6ji1609 m)

  What must be your average speed in order to travel 350 /s+ksp .tuqv- (jxwzv 2f+6b zkm in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 z/wk9l1a8/ hvlt 3;ehxnq 8b nmin. What is the average speed of the runner in m/s9hvh;aql/e8 t kxnw/3lbnz 18 ?

  A car travels 90 km/h. How long does it take for it to travel-;ow1o7 ws7agl6wavfpy .2 b 6a3qc si 400 km?

  A ly (light year) is the distance that light e8z l(2btn i8dtravels in one year. The speed of ld n8zibt2el(8 ight 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 road and you look to the dgk ipgp *-/5e ;r:ftmyon*nre,c 0r 8side for 4.0 s, hownprr* t in:8pye*rf;,d g5-og/mc 0ek far do you travel during this inattentive period?

  If you run a complete loop around t5ocf)h1n eqwi zs m+xfu60*,an outdoor track (400 m), in 100 s, your averagetm, c6ixo)q *hf5 znu1w0sf+e velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, thfv kgth,v723 ben 1.0 km east, t btvg3f,2v7 khhen 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 o7)mjp fcsf/r;)d . b7h- xajb(gq1 xqNorth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bearjx7 ahqb)gcxr (mbp1.q;o dfs7/)j f- 's average velocity?

  You are driving home onq c)j:o/w:y p a sdc+ejn; i2kddrvt+21 -saq4 a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after drcyj q es; advcs/wa22dtor i++-pn j :14dq:k)iving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 1l zm34n gd8-aw60 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorisd3z4-l gwn8mat for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What bfw:35e7nc2ob -j;0q jtpj z jis her average speed for tjzj;0:c 5bo-p tqw7j jn2 3fbehe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nord4,idoty,tg j n66 f1lth for 750 miles. What is the average speed for the t,d41o6ngjti,y 6 td flrip?

  In a 400-m relay race the anchorman (the person who r v6 b3cjhm5 ft5wtovk95tjh+8 uns the last 100 m) for team A can run 100 m in 9.8 s. His rival, the wtmf c+h6v5kbt5 h3 jj58 tv9oanchorman 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 race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 10 s. The car's average v -tn /f/0,bs0k1ug ikzjiwyn9 elocity during deceleration was 32 km/h. What was the car's deceleration while slowinsi-fg10n ui/9bk 0ywknzj/ ,t g down?

  An airplane increases its speed from 1y sh2 bo4 04z.ksf2mm*ajfbd,00 m/s to 160 m/s, at the average rate of fs odmmj. b,s4k2 fzy4a02bh*$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rbp+ura4;ev+of6d3 rcate 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 acsejl 5+ ukvw7+celerates 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 accelewqvy-ie.9bj75kzr8x07 k t5be uk 5girationzuqkib7 e50wve79j 5-grk5k8 iy.xbt of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocf0rykmz3z dze :i+hv3 ia+o) (ity of 6.9 m/s experiences a constant acceleration oozv3++a ( d:ym i)h3kriezfz0f $3.0 \; m/s^2$. 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 s0wlelsm,(l 6z )hdf ;2v flb:upeed of 538 m/s strikes a sandbag and penetrates a distanc; 02f dllvf6 lu)wbm,l:zhs( ee of 48.96 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapul5wgc8 vwk:8nf t 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 is the length o5w f:gwcn8vk8 f the catapult?

  A car starting from res rbq-u6z9rpb -bejpu.) cy+,.eose)jt moves with 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/s in a distance of 200 m. What is its average a2s3w2 ,oxcmhycceleration? 3sx2cy, 2mhow

  An object starts from re oz jmmr enudh)fb /t0g1q(7.*st and undergoes uniform acceleration. During the first second it travels 7.0 m. How far will it travel during the third sefm(7dzr et1/jgn .o0h)b q*umcond?

  An object is moving in a straight li sk6cx/o ia:133sckaxne with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. cosa63kksixc 1:a x/3How far does it move during this time?

  A car starts from rest and accelerates 5(;umal/7w dhv r.u7wha g 57st1s qkguniformly 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 y ldklv)sthf*8vc a 77-g x+5zuva 2-96dukkacan decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that has bee mo,9b l((nzaen waiting at the inter9m(l zbo(e, ansection starts ahead 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/:2 0 um yra llu8tq*-44qdyopgs on the surface of planet X wher qlo8-yd pul*m4yr 2aq:u tg04e the acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wipn3k( sq kj0p7-l.hklth a speed of 12 m/s on the surface of planet X where the acceleration due (nh kklp.kjl qsp-03 7to 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 kk 1/ 0oqurt5d 7xm;xhwhere the 1hu ;/7xkqd0x5 om trkacceleration 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 surf26q fuvmt jjj 1es:dq1d,e4d0ace of planet X where the acceleration du 24,jqv1q0j: udsd f6eedt1mj e to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greas*+epdwe 9ig 1ter than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expecwde+e*p9 1ig st the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What isok na8w-)xw 4xtrwka:2 g8qb , its velocity after 3.00 t rwqo: w- xga8)b8xak, 4kwn2s?

  A bullet shot straight up returns to its starting point in 15 s. Whos x 5 gjn0b-rigv -z3yxb1h2*at is the initial siros0g -5y-vj *n2g3bxh1bxz peed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take6)ggrq sevw8 8sr76yv to return to its staq8v 7rew y8gsr6s6v )grting point?

  A ball is thrown downward from the top o6olpz5w6oc2 lez5 dwvml5-n8 f a building with an initial speed of 19 m/s. It strikes the ground after 5.6 s. How high is the buildin5lvwn lzdze8665o- c5l mop2wg?

  A ball is thrown straight up with a speed of 30 m/s. (only filll -5,v,z hol96pbk dqy in numerical val,ykdh6 ,p v-59olbqlz ue 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 p c b4+rm/ nmbg)vl+7rwith a speed of 36.5 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity aqd -+ahp nw7q0 g,dxo(t t = 1.0 s?

  In Fig. below, what is the veloc5712 p)fz 5nqrpj o e0ijrvyifhln*+. ity at t = 2.5 s?

  In Fig. below, what is the :gi x6gao3i5 me 5cwd.:-v9cloasgf my,u9 3g velocity at t = 4.0 s?

  In Fig. below, what is the velociq.xy+y e.e9aw ty at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 td ii.ll 02dgahatcvn0ij c q.3mt9z33d;48h no 4.0 s?

  In Fig. below, what is the averagem(l .yuc77g laj.dsc ; velocity from 0 to 6.0 s?

  In Fig. below, what is the acceles4z*s;w z mh9xrnd,-vration at 1.0 s?

  In Fig. below, what is the accllkpo,b33 a8 jeleration at 3.0 s?

  In Fig. below, what is the average accelera(yv s19. 4fupz)bvv pation from 0 to 5.0 s?

  In Fig. below, what i4lujd,u adm8 :uox m:)bh l6/cs the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemejnb9 n 903fwrlq .4hcent from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|v jlpcxi-r/(zg:ch t+ /elocity}

  An object can have a varying sr0l* q yojg jes:ii/ fje*+2l+peed if its velocity is constant.

  The velocity of an object can be negative when its g-2xud (iv x4bacceleration is positive.

  If one object has a gru p b,++cq4 v9f/nfpp2w(f5;xijtm qseater speed than a second object, the first must have a greater acceleration.fwx2q4;t( qnvi/5upsf+ p+c,fj bpm9

  Two cars emerge side by side frompugn vpk18z . w.ysgn; ry4p 21m5oe:t 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 incuqqfr2p/4a4p*47 xccnn it * qreasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat bvvbrje2 :9vi0 c+1b iwith 2jb0i b 1e+9i vrcb:vva speed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happening to its acceleration, 0:h5x*hbyymkknp8zrh. 0ff 2 how does it change if air friction is izkf8r x.2*:5hhy 0mf0 yn bpkhgnored?

  As a freely falling object speeds up, what is happening to its acceleratio/qz1 /s g6 n-* mgcsatfho.3wfn, howsa f.wsgfo/6m1/3qzc* tn g-h does it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will tud b d76(ypbk oga zk.)ow+;*return to its original position with the same speed as it had initially if air resistance is negligiblebk ka(tdwp6y gzoo u.d;*b)+ 7. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at im8pcszc)23v) ;mqe g the same time.

  An object can have nonz)ekz 6o 8ksgr.ero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to they)-vp +eglq8ai 7g0 t:;sfih e fifth floor making no stops along the way has zero acceler):- 8ivggaf0+tel sqpe 7;iyhation all the time.

  A rolling ball moves from lqx1qszhaf2l(i )4l a fz-t8 pxe 7/4;z2nogp$x_1=3.1 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.3 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete l li41sf*ss e+,wq ,uzjaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 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 91 m aua pg s0ztzy7q331 t7r4 xup6zway in 12.5 s. It then turns abruptly and gallops halfway back in 4.6 s. Calcu 0zx7 rs4tpzup3 1yq7z63tagulate (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 frot/l ol* f ;fyh0rf; 4s9+qggn e(ocuhpq7g:g)m $10 \; m/s$ to $25 \; m/s$ in 5.3 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 frombi,/ (u87zj oswtvd7h $18 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ofrka4rwj0; o(+pv ml7e $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed a(,. hybukd2,dtcid( k+ m0jjnbou 0,kh+(tu jdjbdny., k2dc( mit $11.3 \; m/s$ in the first 14.9 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speebixjd ib2,77+ ymd bm99vrz2 hd of $16 \; m/s$ to rest in 4.64 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car u j( 3* 3h(7;e 3dyp+c3ic 6nqktk jvc3bkeacmleaves skid marks 92 m long on the highway. Assuming a decelerqem373cu+in v3ced yt6k* jjh k(3c3kp b ;ac(ation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trud 4(gap,k.rh*eh2hwjp0o p+d k ohz8(ck going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than6c /1,x( aqsa ; afugi1on0y kru-emv2 30.0 min. After exactly 27.0 min, there are still 1 ai1ue;m /f6kyvg0r- aso1,nx 2q(cua100 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?    $s$