Suppose that an object travels frove0qlu 3 m futh6d4nd(84cpk5m one point in space to another. Make a comparison between the displacement and the distance trp0 c5qlhedf8t4mn 63uk 4 (udvaveled.

  When is the average velocity of an object equal to the instantane ixg)ehuw v3.)ous velocity?

  A new car manufacturer advertises th-iia-k0u *tsd k6 os6aat their car can go "from zero to sixty in 8 s". This is a description6t iu--*sk6ksda i0a o of

  An object moving in the +x axis experiences anluulw 759f1kxh 4b:c h/dups x /o*7xc acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) z*. qygjz h8)21ozgdsbegins to slow down as it approaches a traffic light. Make a statement ch1y*s.8zq2zgjz) god oncerning its acceleration.

  Suppose that a car traveling to the West (-x9emg sz5td 3zf8bf-n 97qk f3h direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accezf7kg5 -q3behtfn9 f3s8d mz9 leration.

  Suppose that an object is movingsg xenkpr:+ 8* with a constant velocity. Make a statement concerning its acce+ *nrek xsg8p:leration.

  If the velocity of an obj/p(e/6f xpb-as x.wql ect is zero, does it mean that the acceleration is zero? Support q6(. pfa/sbx-lpxew /your answer with an example.

  Can an object's velocity change direction when its acceleration is consta8z lztb3 -59l.t w;(futzntfx nt? Support your answer with anf5;tz ( tutfxznwtbl-8 3l9. z example.

  Suppose that an object is moving with constant acceleratiobsy(ucin s7 (:n. Make a statement concerning its m7cib((sny s :uotion with respect to time.

  Can an object have increasing speed while its act+fw * yo)aiqsqd7)v 6.rb (jkceleration is decreasing? Support your answer witt6ajf.7o *qs() ri v)bdwyq+kh an example.

  Suppose a can, after an initial kick, moves up along a ra/wdjn4cdjewhpo q)-bo :5)lte79 5 smooth hill of ice. Make a sta o7rlho 5/) wc4dp)jdtne9web5qj -a:tement concerning its acceleration.

  Under what condition is average velocity equal to the average of the objetrh pk4 6qr/ 3d-)*f2g axo7lu5,dg7z aeuz dnct's initial and final ve*q p23f ah7g5e6 x4orgun )d,d/ tr7 dlzazu-klocity?

  Objects A and B both start at rest. They both accelerate at xcxnk/h5 hq+g 7j5,hw the same rate. However, object A accelerates for twice the time as object B. What is the finahxj hh5 ,n gwq7+/5xkcl speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelewa+j4*:0fvch zfj7bc2rofb2 rate 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 tccfjf wbh:0 2+ jo 42*rzb7favhat of object B?

  When an object is released from rest and falls in the absence of friction,y8-wnyj)mf1ri ;x,bt which of the following is true concerning its mym ,wnrf 81j-)i txy;botion?

  When an object is ref2wb8:tqc 6jco( ruk .leased from rest and falls in the absence of friction, which of the fo(qfukj bcw8 t:or2. c6llowing is true concerning its motion?

  Suppose a ball is thrown straigheixwe 9e+ q4gu ;w*mh7t up. Make a statement about the velocity and the acceixge 4w9*hee; qw+7 muleration when the ball reaches the highest point.

  Suppose a ball is thrown straigh: zawun. woq29t up. What is its acceleration just before it reaches its highest poi9oaw2w. qnz :unt?

  Suppose a ball is thrown straight up, reaches a maximum height, then fe fd3b() sb)nkki 046 gxf dafjrq7-:oalls to its initial heiga xbe )(qdd4fr nsk:)jkg6-0iofb 73fht. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initsgi4(cxv.7 ,ii a..jllzv2 dvial height. Make a statement about the direction of the velocity and acceleration as the ball is comingg. z.vi4si,jdvvcl a.27i( l x down.

  Suppose a ball is throw uux90si0u0lk - 9ydazn downward in the absence of air resistance. Make a stateuy0 9zd90-siukl0aux ment concerning its acceleration.

  Suppose a skydiver jumps from a high-flying pe*gowq 2b0h1t5eg7ddx( 9ryg lane. What is her acceleration when she she reaches 5hgoe* (7yxd1rt2qb0e g9 gwdterminal velocity?

  A ball is thrown vertically upward with a spe0kgm:e(7* az kb-pgol ed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of kb(p:zak7*megolg 0- the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, balr )p fbq09 7ta7x-ztkil B is dropped from the same building. As time progresses, the distance between rx 7bat-0fk9ptqz7 )ithem

  Ball A is dropped from the top of a building. One second later, ball mmzzh6emv8*b/en3 zsbw1t5)0 z pj5tB is dropped from the same building. As time progresses, the diffe)pjms5zwz 3/0bh* eb mz8t6vz5tmen 1rence in their speeds

  Two objects are thrown from the top of a tall building. One is throw8;lhxakak-d gu;i4/l 0x j i;xn up, and the other is thrown down, both with the same initial speed. What are their sj k;g/ da x4hx80 ;;xul-aiklipeeds when they hit the street?

  A brick is dropped from the top u+;d u2xbpwzig/gj0 1 of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resisd0pz2; ub/wui+1ggxj tance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in tid42.fsx1u 9 fsbc9t(xmm 4yohe +x axis. The position vox92 m914.t dfusysi4 xb (cmfersus time graph of this object is

  An object is moving with constant non;a5h )xjl7 r/ *ovk/rgcno1pu-zero acceleration in the +x axis. The position versus time graph of thisuk/g /75nxrcha) ;v o1lop* jr object is

  An object is moving with constant non-zero velocity c7aubmkb:8j6 in the +x axis. The velocity versus time graph of this objectbmk6c bu:a7j8 is

  An object is moving with constant non-zero accelerationz5ey p1mjuc /ats3(. s in the +x axis. The velocity versus time graph of this object (msc1/ 5. ey3szuptaj is

  The slope of a position ver1buj7p8/jq d ysus time graph gives

  The slope of a velocity versus time graph givesbvrqfv z7d6hi+61mww/o ek9 .

  The area under a curve in an acceleration versus n)u896o.n yx*pfivfm fjp41e.f xj(ztime graph gives

  The area under a curve in a velocity versus time graph gives i vk-ftw-qzpwjvsr* 2d:oy uy1c.k :;2f-4yr

  If the position versus time graph of an object is a horizontal line6riewav,pq -8emd n i/tqn+66, the object n qiqan twp,md - v8i66e/+re6is

  If the position versus time graph of an object is a vertical lin3idm d4ki8u3lwc w3 l0zikos4b tgf, mw u99;0e, the object is 9gb wuo i4ci3,l3mk08d0t9 if;dzu4 lww3kms

  If the velocity versus time graph of an object is a horizontal line, the object h8jh;2rwbq8i:hr yu-)7 fzog -h8)oguq:hz2 8fbi7 ;wjyhrris

  If the velocity versus time graph of an object is a straight line making an anf-lnn e o(ierre55 yr1w j+./qgle .(/1yjwol5-e 5e+ r feiqrnnrof 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then;g4zyx5aq9 yb 11.0 m south. Find both the distance traveled ayyz ag 9q;bx54nd the magnitude of the displacement vector.

  A boat can move at 30 km/5fq09jinzj8 ymar* sl6 z1rd.h in still water. How long will it take to move 12 km upstream ydm5 8l6rjrf*q 01s.nz 9azjiin a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = m.d/ofdq)5v8e xx p)p1609 m)

  What must be your average speed in order to travel 350 kmv/v hj3 x5zzw 3wi*zc( in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whatcb /w s u*7tuitkb.mp8e2m;.v is the average speed /vbut*e. 2;pmkbcut s7i.8w mof the runner in m/s?

  A car travels 90 km/h. How long does it t eq1 *y8vfe+)x su5.o(xzikzsake for it to travel 400 km?

  A ly (light year) is the distancklc7rr6*/kxyb.f f*.z u eaw( e that light travels in one year. The speed of light ifwx b*.*(u6er crzk.ya 7 kf/ls $3.00 \times 10^8 \; m/s$. 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 /w:j36 )uxh zexrxda straight road and you look to the side for 4.0 s/xeuh:rd)j xwaz3 x6/, how far do you travel during this inattentive period?

  If you run a complete loop around an out4+6vnsl5cg ;5d n4cra u9tpd pdoor track (400 m), in 100 s, your average velocity 5pl cndvg;n5 6ru9c+st4p da4 is

  A polar bear starts at the North Pole. It travels 1.0 km*o*qv4d**nadq ospdp wccrd;2 .rj 6an+f) t: 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.6 s.a4daq rw2n+d)fpnop;*tc** jd: qdov r*c What was the bear's average speed?

  A polar bear starts at the North Po)biq spt. b3pll nb74 dgu8p36le. 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. .4u)3qdtpn6sbg87 li3ppl bb This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It then/15zw+43iveohpnv9k n w ya, n 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 froa 9/n zowv3ywk +nnhe,415ip vm school?

  A motorist travels 160 km at 80 km/h an59ampc4o:m0 hzas ,xed 160 km at 100 km/h. What is the average speed of the motorist m e mch:, 50x9zpasao4for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/ht(2*l: bq5pxyr zy6n yu4 bzp:. What is her average speed fo: zqx*zpyru ( ny:ylb4pt6b52r the trip?

  An airplane travels at 300 mi/h -zn:xhx.dri;m ph97h*j8 eo 4kon*fhsouth for 2.00 h and then at 250 mi/h north for 750 miles. Whnf;pkdh 7hi.9n h*o * x8:4jo-m zrehxat is the average speed for the trip?

  In a 400-m relay racppxh, m7bo6l1t 98ms chm- k;je the anchorman (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 cover 100 m in 10.1 s. What l ; m8mm-ptx,7bchk6 9osph j1is 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 average1lc.j : nwiw)q velocity during deceleration was 56 km/h. What was the car's deceleration while slowing dj :wq 1c.)ilnwown?

  An airplane increases its speed from 100 m/s to 160 m/s, at to.u h(frtgz2 7gwz8y6yf+j7 ahe average rate of h8fj.7fzoa 6g r(gyut+2 7wyz$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of jm.lu9t*38am:-ym8j c je8mln zb*ae $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerates q2c mtn;9 *oagat $4.0 \; m/s^2$ 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 forc;l)k+8 kgz2 * qrjzun 10 s. It then speeds up with a constant acceleratio nl+8r2jgzc;q zu*k )kn 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 5.5 m/s experiences a constam v.7u3zuqmpdl z0* 4unt acceleration o.zd0 u*pm4 mvl3zqu7uf $1.8 \; m/s^2$. What is the cart's displacement during the first 7.1 s of its motion?

  A bullet moving horizontally t -4yvgw2 uw 8,3wgi ;beqilr636ffy lho the right (+x direction) with a speed of 306 m/s str2y6;ri4,u6-f83lw 3bh egv lfwygwiq ikes a sandbag and penetrates a distance of 22.29 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 carriy2h* 3kebk *wwer. 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 thewbe y*kw 3*k2h length of the catapult?

  A car starting from rest moves with constanp a5* 29aq 9tlxu2 rymme(k6qat 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 8fly 9)83rono5,cu; d, hl m,rsyzhmu in a distance of 200 m. What is its average accell )rfm8yu,hy5l,8 cn r ;smh9,dozu3oeration?

  An object starts from rest and undergoes uniform acceleration. D xnig8g9-wq zu;(v s1iuring the first second it travels 2.4 m. How far will it travel durx v-zuinggq(8w s9;i 1ing the third second?

  An object is moving in a straight line with constant acceleration. In4a4a gluyjwd -q r h390z0zn:kitially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How f dr wh-g3z 4:kjal0z049qyuanar does it move during this time?

  A car starts from resn0xkex/8i:+rp; xztdxvs)gg6 wk. s 4 t and accelerates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

  A car with good tires on a dry rogmg r-q v dujh734,+rwad 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 gre.ra-q/ lni8r ep3)zdnaoc3 e/ en, a car that has been waiting at the intersection startod8nr /-ai n/.ap3) elc3qzre s 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/s on8)gkn j. fon)b the surface of planet X where the acceleration due to gravit8fj nog)nb) .ky 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 planet X whes0vlzi xh6;+sre the acceleration due iz;x+lhs0v 6s 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 planet8;zd/+(:p ffjwp v,y 0eyijav X where the acceleratiovfzey:( a0w/,pfy j v8ji+dp;n 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 upwardc pc wcy514r+zgt5myv:/v+u u with a speed of 14 m/s on the surface of planet X where the accelert vc1 cp5g +ry5/:zuwyumvc4 +ation due to 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 s. Ilg (;e+m 83+cg fovkrrf your friend holds a ruler between your fingers and releases it without warning, how fav 8ol3gmcer;k(rg+ +f r can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocitzy0yxs:n pa:w267rv0ogvwduc m*t/* y after 3.0s/dyo c*vg wx z2vyna :u7r0m0wp6* :t0 s?

  A bullet shot straight up returnsb u)w cu(,jbz dldi-7+ to its starting point in 10 s. What is the initialc,wi -lz() bbdu7+uj d speed of the bullet?

  A ball is thrown straight up with a spe6edg(hh,vy3op))k y,j j ;nzeed of 36.0 m/s. How long does it take to return to its staro))p3,h n zdvjhjy( y6;,g eketing point?

  A ball is thrown downward from the top of a building with an initial speed of 200 e)yo 6za0ko b,kc*2htje m3k m/s. It strikes the ground after 6.0 mk0e6ok tjey0kb3z, haco*2)s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only f c6nwlu amo*txgm*dsw2bd29x.0n1+o ill in numerical value in the bxdnw+9 0lwx mdo6. tm2*c2*s1o ngbaulanks)
(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 21.3 m/shtb04pgkgo0pziq.)j770 op f i r ly7/. (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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity h1k3nyxm 1auwql huqxv)+5 ym r.22 1mat t = 1.0 s?

  In Fig. below, what is the velocitygm*jtyo ;5twvg gou ioncu: 1/dg+1 +2 at t = 2.5 s?

  In Fig. below, what is the velocity bd /4syenif) i )dggmuyxt4j9j74+ r8yl bt-5at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5pqor3 vx9bd,* s?

  In Fig. below, what is the aw))l y; l1u7efkmdu* average velocity from 0 to 4.0 s?

  In Fig. below, what isf9e0fd9 ixr f77:h ltfb7t.e d jw5z3u the average velocity from 0 to 6.0 s?

  In Fig. below, what is the accelerhpb2c.;lj+6o 9 cnmoy ation at 1.0 s?

  In Fig. below, what is thp (nmz)l *0ikwe acceleration at 3.0 s?

  In Fig. below, what is the average acceleration qwwc/.sj1iagzjm f 3;4;je 5vfrom 0 to 5.0 s?

  In Fig. below, what iss03( avm xvcn t*)6ipk the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 t* t e(5hqzw)gj )0auzoo 8.0 s?

Does a car speedometer measure speed, velocity? {spk7nxiq.d*(wctvgh 8: eed|velocity}

  An object can have a vm q s84h.ulk2larying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration i2c 3i h :,hwr2zxgi-lss positive.

  If one object has a greater speed thanx +16a s( 6ojajmwrmgt vw ofd.89if4( a second object, the first must have a greater atgmra61j+ sx(v (wm.8of49ojwi ad f6cceleration.

  Two cars emerge side by side from n5l8l3 bx xcx5 u/1drzzd0x*ha 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 itxci- g, rxkb::s acceleration decreases.

  A baseball player hits a fikm;- 4c f:ix- sdod:aoul ball straight up into the air. It leaves the bat with a -:od af4 xsic:kmdi-;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 happe0k);) mzpcvy tning to its acceleration, how does it change if air friction is ign)vyc0p) ztk;m ored?

  As a freely falling object speed gqb t/5qgx+vvyix/ +8s up, what is happening to its acceleration, how does it change if air friction CAN b5gx8y/xiv/ qtq +gv+NOT be ignored?

  An object that is thrown vertically upward will returnf(p k haa3mr +0xl+tv* to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be alterem v++kl 0rht*(a3axf pd?

  An object can have zero velocity and nonzero as kqd: *nuz;r/w;:p c ybm/q) l1slze;cceleration at the same time.

  An object can have nonzerox- xxx t-ta2;h velocity and zero acceleration at the same time.

  An elevator moving frohaq:5 ) vp,le yw*5zda(p7raem the second floor to the fifth floor making no stops along the way has zero accelerationa v:w 5qayz(p)p7e5head *,lr all the time.

  A rolling ball moves froy,pc4tj, yubx gij 1-i01q4al m $x_1=2.1 \mathrm{~cm}$ to $x_2=-6.4 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile ,n0mc nn d7n 6-ukupg-eezd7* ($1 \; mile = 1609 \; m$) track in a total time of 8.7 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 sm rm ( 1yytve1pca81)a y72zrwtraight line, moving 103 m away in 8.1 s. It then turns abruptly and gallops halfway back in yme2(11 vtc)mayw rp71 zr8 ya4.7 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 fr .i)8yymxqtyl 8/vv;z om $13 \; m/s$ to $23 \; m/s$ in 4.3 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 fron 3.-padqfdxj9f)p *a m $21 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rbss;mw0,,jl ekb56 sl0mvb c4each a speed of $26 \; m/s$ 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 essential a7gx2sub fw gq7nk:0wzt18z7ly top speed aboutxz1 kf0zgtnw77 sa8g: w7 u2bq $11.0 \; m/s$ in the first 13.0 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 unifo5/ 9*g)jemjhlejqx g/oj1* bn/dr(odrmly from a speed of $19 \; m/s$ to rest in 4.66 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves sk m/c;d79ic)k t,ult;epe. wfpid marks 92 m long on the highway. Assuming a decelc9wum;eft tik,;)./ p 7lc dpeeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc*/kj. pkw.bk/up5ttz k 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 j4* l2yge1/ugv moa *x10,000-m run in less than 30.0 min. After exactly 27.0 min, there agjx 2uvye *4o m1l*ag/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?    $s$