Suppose that an object travels from one point in space to another. Make b dew+ uceh27x (l(a(mjss 14wa comparison betweendwa(7(2 w+ebxh4( e1jlmcus s the displacement and the distance traveled.

  When is the average velocity ofu(lh*hdnc 2 l/ an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero tj1 4gcn w; 3-zom;l9l o2cy,qzda5rdr wy;8rlo sixty in 8 s"g;y3r 2o;,58w;wzjq nl-rc4coad1l dl r9ymz. This is a description of

  An object moving in the +x axis experiences an acceleration of st. )hn. x9t9gzecn,(lnrb)x$2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) bea;cf9;qepg)u ce/8lb-krpg-q gx ,; dgins to slow down as it approaches a traff; cfcu/k9eraqple8 g;p)x; gb- -q,gd ic light. Make a statement concerning its acceleration.

  Suppose that a car traveling o bh1wd* 5wywro(s7*dto the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accel*1 ow *wyd5d7wo rs(hberation.

  Suppose that an object i /5x k ykn+pkyen-wzj0nd35p 9s moving with a constant velocity. Make a statement concerning its+kkny3 jk0 9xepny d/nzw5p 5- acceleration.

  If the velocity of an object is zeruw t6r3j+l a u+i37knwo, does it mean that the acceleration is zero? Support your answer wiu+wk3t7aiuwr3 n l6j +th an example.

  Can an object's velocity chamd po2 27 wl mdv r.ydwdis)7f;23;f6rr cite.nge direction when its acceleration is constant? Support yo mlipy 7f)d cfwo6 r;dd. sr3r7imw ev2;.t22dur answer with an example.

  Suppose that an object is moving with constant8 ) f*16ktuhjz0 ydw8a(fkjl,x vm6 ou acceleration. Make a statement concerning its motion with respect tjuwly(dkh61km, ox fz 6uj)8 aft0* 8vo time.

  Can an object have increasing speed while its 6 jat+4 -knu r kcacz6;ft3q)qacceleration is decreasing? Support your ac acf nt6k)+ qr64uqzt-jk3a;nswer with an example.

  Suppose a can, after plcgh)a j*,u-j ro3+pan initial kick, moves up along a smooth hill of ice. Make a statement concerning its accelerl3r+hu apcpjo,j) g-*ation.

  Under what condition fhv m bboik+py +c/2i;3b:*cfis average velocity equal to the average of the object's initial and yi b *hkbbic3:+fv+2fop ;cm/final velocity?

  Objects A and B both str)i m/ *(pb. as)wkpp,dyos8lart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is theowm* r8kib ad/.pyp( ,s)l)sp final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the sam:ud8b(ut-ru806 xl duopxg a,e rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of obtor60(xb,xuu- :u g8pa8dl udject B?

  When an object is released from rest and fallg :* iloxvy6;ms in the absence of friction, which of the following is true concerning its motion y:io*m gv6;lx?

  When an object is released from rest and falls in the absence of frict6x9ra st8s 0kzol1k3iion, which of the following is true c3sk691t 8z iaslorkx0oncerning its motion?

  Suppose a ball is thrown straight up. Make 7 gx;m 0vd;upy k)s3czw;3ruzv/g3 lsa statement about the velocity and the acceleration when the ball reaches the highekvc/dz3spx;u rsy3)z;m ;l 7uw vgg30 st point.

  Suppose a ball is thrown straight up. What is its accebh5a qv.c 4m** a.nzbhleration just before it reaches its hi4..5hqa* nahvbcbm*z ghest point?

  Suppose a ball is thrown straight x6-p8ub ;qmtpe)jsei)rh7 )s up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up );-7m)eprxiq)hpu 6est bsj8 .

  A ball is thrown straight up, reaches a maximum height, then falls to its initiaasrg5gpz ,33fe/qcl) nk//w wl height. Make a statement akn c5s,/gfr/epwa3qz 3lg)/wbout the direction 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 stat nh wu*x09t(7zi/ipbfhxu1)m ementhip hwn/b*iuz(7 ut )9x m01fx concerning its acceleration.

  Suppose a skydiver jumps from a high-ffu2w1, y d otymzcz:p.o8go0* lying plane. What is her acceleration when she she reaches terminal velpcztu*wog,yo z :o0m2 8 y1.dfocity?

  A ball is thrown vertically upward with a speed v. An identical secp,r gcq *u5bi;ond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball toup 5,ic*qr b;g 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 fr i hia-4d9c2erc*.usecond later, ball B is dropped from the same building. As t*c24hc.i -r ruiadfe9 ime progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball e1zc; w:,s/vs2f/y /a 2mu+ndqe tyu bB is dropped from the s y,/f+ /tswvm:2anezbesc2/ d;uy1uq ame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of0 g6f0ij+07 ;y nmf g3zhzpblq a tall building. One is thrown up, and th njm 3 fg0i7 fzb0ph;qzlyg+06e 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 blz):s 5zw :twtqeng+-uilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acceleraties )t+-:qgw5t:lzn zwons of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The position:lsrw:lfrn;*s)5 :up 5vsy //wkcctv versus time gra n5cww :5;* r kr/v)cs/::ufptlslysvph of this object is

  An object is moving with constant non-zero acceleratt jjx;r6r4a(v wmx5fki9f,w*ion in the +x axis. The position versus time graph of this object rrt9vx a(mi4kf5 ; x*,jjf w6wis

  An object is moving with constant non-zero velocity in the +x axidu1 vvhzxzuh./31/u vs. The velocity v vv 1z1u/uzxd/.3vuhhersus time graph of this object is

  An object is moving with constant n25+4emfcwf ohqx(;g con-zero acceleration in the +x axis. The velocity versus time graph of24ff;5c(o xhcwg +emq this object is

  The slope of a position versus time graph gyho+s.riwa y3yj: 4b*ives

  The slope of a velocity versus time graph gia/6quem38vuz ves

  The area under a curve in an acceleration versus time graphl-xvi0i3nqf ,ouzs -t c,9,df gives

  The area under a curve in a velocity versus time graph givelsa ;p+ex tdhf:rl//z3d z+0 rs

  If the position versus time graph of an object is a horizo8a u/3yy-jvkvntal line, the object i8 k jvvau-3yy/s

  If the position versus time graph ofjw pd,dotc rq/m.pw2g+)edepha 6n n*0x8 .t+ an object is a vertical line, the object is d+.d)6e+ /w8*xrpndo tpcepwa,mtn2hqg0. j

  If the velocity versus time graphkzx yzth:w- mop)(n-k-,o2ch of an object is a horizontal line, the object -pz)yom--:zchk t 2 k,oh wxn(is

  If the velocity versus ti;y-xn mxutn . t,43ldbme graph of an object is a straight line making an angle of 30 degreesuxt.bl4, ny tm ndx-;3 with the time axis, the object is

  An object moves 15.0 m north and ogeso8b9lt*w;;.bj mthen 11.0 m south. Find both the distance traveled and the 8be9mo ; ojlgs*.;wtbmagnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take ;eawom5es8kf0q a6 3v to move 12 km upstream in a em03kosq;e68a5av f w river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi 22enx: px/n./olrx2tnwyz. o= 1609 m)

  What must be your average speed in order to travel 350 km ( a 8vc*7kpr vj:(jvzq y u4l0how-1+ *htqugoin 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min.e wbp8n18h6ry. hz;ra What is the average speed of the runner irhzae88.61 hwpnrb; yn m/s?

  A car travels 90 km/h. How long hg/gk699x zz gdoes it take for it to travel 400 km?

  A ly (light year) is the distance thatphkuny*c4f9, p nnt9o/h;a 4x light travels in one year. The speed of ligh p;t4,u9ko4h nx* nnfyc9h pa/t 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 side for 4mzpd; 2 0;yse6m8 xmz ct+eki9g) *jqo.0 s, how far do you travel during this m)6p id 0yoc tje;km+esz; 9gm8qx*z2inattentive period?

  If you run a complete loop around an outdoor track (400 m),xs/t8 u 3 dp7c,novdah7j9ue0 in 100 s, your average veloc,n8tsp7uadve hd7/9 03cjxou ity is

  A polar bear starts at the j9 uwxj jxvkx.r+m6,-North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km nort xmwv6 xk+9,j -xruj.jh, 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 North Pole. It travels 1.z u;4r 6glfba)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 grl4;u6 af bz)bear's average velocity?

  You are driving home dy d; pfx9p 6dr419 ts/mzcxt4on a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 1 msfr9 x 6ttdxdzpy;4/4cd9p35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160e7:u8 9xrtgfe km at 80 km/h and 160 km at 100 km/h. What is the averagueg:8x 9rfte 7e speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and m 7ehki957d,ybs . zol2.0 h at 100 km/h. What is her average 97se. lz7o5ikh,y mdbspeed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 m l(d/ sgw(vg-5t 6hllwxair3+i/h north for 750 miles. What is the average speed for the trip3 5vrl(ilsdagl wg 6w+-ht/(x?

  In a 400-m relay racin+-;3 l4 ifad m5qhhue 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 i ;4-3u5ild +m iahhqnfs 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 t:r 1zq(b-1ucnsbpbg6y5 p: rmo a stop after 10 s. The car's average velocity during deceleb:zbprb1p(nc -1r5q gum 6ys :ration was 72 km/h. What was the car's deceleration while slowing down?

  An airplane increases its szimjb8nc j9/smt sex t:+:um)4w/h -ppeed from 100 m/s to 160 m/s, at the average rate of iuw/ +h4m n/-t8szcjpsje9m:bxt):m $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acc hq cnh3(nom j3)g)6yjelerates 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 rvdu;7x1 i 4.4mr)qfhsx hge +kest 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 ks6w *da de3t)*ik y2afor 10 s. It then speeds up with a constant acceleration of *syw32ek kd6t*d a)ia $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.1 m/s experiences a ccve+b-g,+o qzhinoi qf)-)s4*s7, cqy.jenx onstant acceleration of qqee +4c,b-g.j,x)hn *ys qz-n+sc)oio v7 fi$2.0 \; m/s^2$. What is the cart's displacement during the first 8.1 s of its motion?

  A bullet moving horizontally to the right (+x directiox 89n 0d23htrwua(b pmn) with a speed of 476 m/s strikes a sa9d nr3p 8 u2bhmxw(t0andbag and penetrates a distance of 73.66 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on angny76g /q yz 5e k+vb2iup/(an aircraft carrier. It reaches a speed of 42 m/s at the end of the cat(p/ qk7en vgygi+6 y/ua5nbz2apult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from resttpl1jgk; s/i/7 , nx8m pq5fdv 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 w(0jxv4cmnr+ zl x70q 80 m/s in a distance of 200 m. What is its average accelerationr z(v 07 xn0+qwcxm4lj?

  An object starts from rest and undergoes uniforfm1a e5 y7x +xhzmakgtphi42g/0*s *sm acceleration. During the first second is m5zsyehtig+4pmh2kx*7/a* 0fgxa1t travels 7.8 m. How far will it travel during the third second?

  An object is moving in a stvor5jc-l* eqy -:*up(3:u a khe;pgmh raight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later ite q:(l* h hru* c5;kppj:v-a-uygo3me is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uncmx2wc/t.vm c+ 6gvaos.ri ,-iformly 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 deey,f07rlb wl(celerate 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 turndes baf1(n( gdl 49lcv0t1 8bhs green, a car that has been waiting at the intersection starts aheablf1b1v( e(g 8dha t4ns0 cd9ld 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 the surface of plaut(ki 5du x6d9 dhampx8252oynet X where the acceleration add dx5 hy5pxu2k(6o89uti m2 due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface 7y zgfk+tah97 v-pg; kof planet X where the acceleration -f7y; 9zkg7k+vgah tpdue 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 ony/:dedj+* f ij the surface of planet X where the acceleration due to gravid/e i*yfd +:jjty 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 upward1 xzx m(jr1qi4fcl7*v-s1sbm8jv ge: with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity 1rbf(7jm:xmc -q8j4x l1i*z1s gvves is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater ew 9s fpf9m5v,than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, howfpf9m 9 we5sv, far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 1+-,*igq/0nmp ;i rmob fj kuom/s. What is its velocity after 3.00 qpb-mjfo1i */g ouni mr+,k0;s?

  A bullet shot straight up returns to its startwmc uzh6gd- a;7tjk- 5ing point in 13 s. What is the initi;ka m7 wh6--j5udcgzt al speed of the bullet?

  A ball is thrown straight up with a n57m+n z) wguxdcsd 5oly)z ,6speed of 36.0 m/s. How long does it take to return to its stn7m yd cz+g) 5 z)ou5ln6dxsw,arting point?

  A ball is thrown downward from the top of e bizv*(/+ k.r3hglz5 5eldu5zjt6fx a building with an initial speed of 18 m/s. i+z5hu( * fgejz5drbx kvzel6 .t/l 53 It strikes the ground after 5.4 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericdq(v/tul+) ud al value in thedu ld+)/tqv u( 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 ubw//qb 4cfnm-p into the air with a speed of 43.4 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 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 isn9en :wj;rqc 9 t/vojhkk1(i. the velocity at t = 1.0 s?

  In Fig. below, what is the velocity k7st6 a4r; t:;)pily frx+cynat t = 2.5 s?

  In Fig. below, what is the velocity at t of18:o59uu0x bsi tlj= 4.0 s?

  In Fig. below, what is the velocio6yg5 95srhqhty at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4. k cht+,l5s p6zei8w6z0 s?

  In Fig. below, what is the average velocikr0:hq a5ze.p ty from 0 to 6.0 s?

  In Fig. below, what is *4p7j*khkddy the acceleration at 1.0 s?

  In Fig. below, what is the acceleb )3rqrbx-p7qxv9 )o iration at 3.0 s?

  In Fig. below, what is the av ..2urmhu, dhuerage acceleration from 0 to 5.0 s?

  In Fig. below, what is +c zt sv;t++u+vuc:j1mi0 pmf the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 ; ;*t lslyul.eto 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloo1 dhuj(8zlvr+y/4 pvcity}

  An object can have a varying speed if its velocity ;0dbach-pj3m8 t)nge is constant.

  The velocity of an object can be neg0h8 zq0 p 50jzhm0nr5a pyen du4+k;qoative when its acceleration is positive.

  If one object has a grrs) r-bwquwf1fkgvs twjp,z2/)pu17jj..a, eater speed than a second object, the first must have a greater acceleration. vq, 7/wk.j w-uzffsr1)pwj1,sat jg .r2pb)u

  Two cars emerge side by side from a t hbc,8wu 0rj osoig+i54gf,b2unnel. 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 increasingubxy8nenfq i5+nm8 .4 in speed as its acceleration decreases.

  A baseball player hits a foul ukw79im790znh+:bey *u8wg b/y g p nbball straight up into the air. It leaves the bat with a spwu9kegmbz b+gu7b0np / i yy7:9nh*8 weed 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 :9z4 1im z zksv gp;5ow1lg:(dl-d 7r+ioz mnbis happening to its acceleration, how does it change if aiolm-; ob(:1p5mgk:i7szznvr9wd1 l z+dgz4 ir friction is ignored?

  As a freely falling object speeds up, what is happe7 dnf-f 0hxvr7ning to its acceleration, how does it cfvxh77d0rn -f hange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original position;hp g hjjf)uzm9g-zeypbx, 01 ak),r; with the same spy ;u;gjppbhm-,1 rx,)fkh j g)9az0zeeed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelera du1y pofy+c0o t74en*tion at the same time.

  An object can have nonzero velociv9uwf(a - h0jqob8w:e ty and zero acceleration at the same time.

  An elevator moving from the second1 (au -ecp4g( irtmaw5xmb(,m floor to the fifth floor making no stops along the way has zero acceleration all the tigxi (-wm,aae(mt(ucbrm 5 4p1me.

  A rolling ball moves frx w9gdpx,7h1jon0ukw( 7 uvp+om $x_1=3.3 \mathrm{~cm}$ to $x_2=-7.6 \mathrm{~cm}$ during the time from $t_1=2.4 \mathrm{~s}$ 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 $t_1=-4.2 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight compmu.dpp) 0pu0k 1hyr*blete laps around a quarter-mile ($1 \; mile = 1609 \; m$) 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 straight line, move ddsnwr(9-t5 ing 104 m away in 11.5 s. It then turns abruptly and g-wnt d9 sedr(5allops halfway back in 4.5 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 frr2- tjpbr9v7n)21 odkgb b6 ap agsu1,om $11 \; m/s$ to $23 \; m/s$ in 4.5 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 froppq) .mbd j;l 7 gj)r(5wjw0ghm $21 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ad 50upyexaj )9fs mnoj-+duxj ,,k)2x speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentiallhnojqhth p g8, 05nb/(y top speed abouttb5n/( jnhg, 0o8hphq $10.6 \; m/s$ in the first 13.1 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 n(nlzxotn7: 2speed of $18 \; m/s$ to rest in 4.01 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skidp)-pf1nlxfu fs lyh3wwq fr5) jk:-/. marks 92 m long on the highway. Assuming a decelepuf: p l.kw)xffynh3sj q5r1 f/)--wlration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g/t2 u n e6k6a5yf8hzzuoing $25 \; m/s$ 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 thangfi u+uko,ap.;lxn w: s1 .t;o 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate ax uu ;+g:poa.i.s; t,fonlk1wt $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$