Suppose that an object travels from one point i6xnmwsoq n5g x/69t/ mn space to another. Make a comparison between then qsn5o6/wxt/9x m m6g displacement and the distance traveled.

  When is the average velocity of an object equal torid qwcl )/o 7a0b7,.vnd5 imf the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to 67m anez5h7bk )+tzjk oxw+ fjg7+d) ssixty in 8 s". Thisd+)7 bjj76++fkxon7zzhskgw5 t e am) is a description of

  An object moving in the +x axis experiences an acl i;*0z(g/y eui jvvz /;jokbi .9i,akceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) ber)vlvha v j; 9r w4ng87r)5phigins to slow down as it approaches a tn g r8ha lvrwj);5)4vhri 79vpraffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slo+elw;fyrjn1- yw*(7 t ht3- tl-kwsxow down as it approaches a traffic ligh tfwkw*ey13- xtojs wl;7-+ -rytlnh (t. Make a statement concerning its acceleration.

  Suppose that an object is mov)q y /tqg8h;cu9ywi 1bing with a constant velocity. Make a statement concer8y b/qw1g; 9huic yqt)ning its acceleration.

  If the velocity of an object is zero, does it mean that the agp4l0 exwat9 1jlv-en ).z z/20vwasq cceleration is zero? Support you-1w s0l/z nxvga .evjw94l) ze 20aqptr answer with an example.

  Can an object's velocity change direction when its acceleration is consnr;olg)wu. x/t +r bi:tant? Support your answer with an exr:;/glirw +n .ou) xbtample.

  Suppose that an object is moving with constant acce,1qyhtmkf;fq +qjw;i w2o : l2v.3lrj leration. Make a statement concerning its moi l2;qqro f2mt:.hywj1qkvwl3, j +;ftion with respect to time.

  Can an object have increasing speed while its acceleration is decreasi*fro:fr0c l y7ng? Support y:7ro c r0f*lfyour answer with an example.

  Suppose a can, after an initwt sx :7hf*1x3w- yemnhglt fsc *tj,0r+.g:dial kick, moves up along a smooth hill of ice. Make a *ex7 .lwts:*ff y,- wtd n1ht0:3rm+ ghxc jgsstatement concerning its acceleration.

  Under what condition is average velocity equal to the aver qd +4(i1ku+ lvoiz+uzage of the object's initi qi1uo+z uvz(4+ +kildal and final velocity?

  Objects A and B bothrps pevn /n5tz351k ,a start at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the f5rpztn3k5pv 1sa/e,ninal speed of object A compared to that of object B?

  Objects A and B both start from rest. They both acceleratexmz qs(wmu3vjg h9n/ x99s.+y at the same rate. However, object A accelerates for twice the time as object B. What is the distance trayxw.9 h+3zs g v9/s(n qmxu9mjveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of fricjusz.wk - .rt2tion, which of the following is tjzrt us.-2kw .rue concerning its motion?

  When an object is released from rest and falls 7)hk-bn 3u. quosdu -rin the absence of friction, which of the following is true concerning it7d nuquu hok-)b .r-s3s motion?

  Suppose a ball is thrown straight up. Make a statemb/ 4( il: xhugnv,zkr2ent about the velocity and the acceleratz( vg2/n 4:lik r,ubxhion when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just sw+u8 3e)zxp5z nru. zbefore it reaches its highest point?pn)zzzr 3 .x us5+wu8e

  Suppose a ball is thrown straight up, reaches a maximum h) +ba:vmv5 lzqy2gob0 eight, then falls to its initial height. Make a statem)m0ql a2ybvoz+gvb: 5 ent about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown stramw25z /paybnmug-0y ki(/wkn7 u)u 5 9(yeeksight 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 ( e20)ku/nu5ewy 7 ips(muk/5mgay9z k w-nbyis coming down.

  Suppose a ball is thrown downward in the absence of9ht 2k9 s0gbtx4*trug air resistance. Make a statement conckstxu20r9t9t4gbgh *erning its acceleration.

  Suppose a skydiver jumps from a high-flying pla-p ,r z0/ikd upvm:3 zyp4eu9one. What is her acceleration when sh0ryu4izzv pp/pm,dok :9e3 u-e she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. .yp; q.6bufxc An identical second ball is thrown upward with a speed 2v (u q; y.6xp.fbctwice 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 the first ball?)

  Ball A is dropped from ,ba,ysgs :(p;t vko7*dct2 a xthe top of a building. One second later, ball B is dropped from the same building. As time progressessy;,bdo 2 ga :7v,pt(x kst*ac, the distance between them

  Ball A is dropped fr5* lc.9te8v88 uazyq i.*pw 2ftkk wzfom the top of a building. One second later, ball B is dropped fp 82u9aw8 y q*5wt.tczfi v ek.8fz*lkrom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is throwng7lvj -,ssiq.,nbt; g* kdachn6e)z 5 up, and the other is thrown down, both withz6n5*e;.-, clad tvsg , 7bkq nh)gjis the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top o41 sgl rla8*q aovk0.bf a building. A second brick is thrown straight down from the same building. They ar8v 4kb .aloq0al gr1*se released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velociv7( bhz2hk5h pty in the +x axis. The position versus time graph of5bhpk 2h7hzv( this object is

  An object is moving with constant non-zero accg7- og:teia:.,tz.d t gn0ou weleration in the +x axis. The position zt- gn:t:e i .o,odg g.tua07wversus time graph of this object is

  An object is moving with constant non-zero velocity in the +xr+,f/pg ljh-j w qoa70q70i ry axis. The velocity versus time grayi7 jq+/wf, pgj0l-hr qo0ar7ph of this object is

  An object is moving with constant non-zero acce.6ar0gs9qttr.j q5 a fr5 btjs+tn b7:leration in the +x axis. The velocity vertj 5ab a:qs5str+ 09f.b.6trn7 jrtqgsus time graph of this object is

  The slope of a position versus time gronbysay/ f;d6g7/g.raph gives

  The slope of a velocity versus time grakm,egunj jf4s0 fo19fce+-q9kn .k +oph gives

  The area under a curve in an acceleration veyv oplg8q)q-sm*5*n2 jonr jef** t- frsus time graph gives

  The area under a curve-yw)w;1fky3l;i q1m tm lkid4 in a velocity versus time graph gives

  If the position versus time graph of ;-sow sb r8fye8 w34t: zo/zqjan object is a horizontal line, the object is t8yf8ozz3-/s ;beoq jr4w:ws

  If the position versus time graph of an object is a vertical line, the 8 odjhhp*8 z st7/tr+uobject is+jd87 pr8th z hosu*t/

  If the velocity versus time k /iu8q;)suq m;8biwt graph of an object is a horizontal line, the object isquw /kb ;q)8ti;8i mus

  If the velocity versus time grx)h )- 0 :kekxwpc.nrmaph of an object is a straight line making an angle of 30 degrees with themx)k)ec.pxrw khn-:0 time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the r3tl xlc09 a4xcfgr6/ distance traveled ar/gc llxa3fr64c9tx0 nd the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move a- t p )*c)s6m aw8suainnpve,opbh ,22-mp9k12 km upstream in a river flowing 6.0 ekp8ho) bmw 2vp 6-t,* a2in )a,pmnscusp9a-km/h?

  55 mi/h is how many mok,g phv-;f.a nc 3oy+/s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 ky70,)b5pf*-m c xo w44j)hel gpyl dpdm in 5.15 h?

  A runner ran the marathon (approximately z/k( ov4y9y4glb9dbisa3p v7 h l4v 0r42.0 km) in 2 hours and 57 min. What is the average speed of /y4 kv(drhb7po9a by il4vzgs 93v04lthe runner in m/s?

  A car travels 90 km/h. How long does it take ;*oha(y, r,;kj yz zkr,q;pfofor it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. Tk553btyc mgszhur:m.: gp . z 5rj2h+zhe speed of light i uh.g2 m5zjkr53.tc my:pr gshz5 b+z:s $3.00 \times 10^8 \; m/s$. 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 aien(8jaa7p9v7ejl8k /f ow* mm /6ojf straight road and you look to the side for 4.0 s, hp9/ o8mj7/a876 j wfk oa*(n vimfjleeow far do you travel during this inattentive period?

  If you run a complete loop around an outdowzk6lxg:kscoz4*u 02 or track (400 m), in 100 s, your average velocluo6w z g0 k:*x24skzcity is

  A polar bear starts at the North Pole. ,3 yq4dl3l u2wsxlg 9q 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,y4s2l q9gdwl33 q lxu starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km en91rqy bdd4mdy :hzw3.p,9 cx ast, then nh93 xpdz: 4by.w,q1c9dyd mr1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 mi jky vdw;c 9hqb3t(9lv 2omz(xy 49r0qles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. wbm3 v0h9(yj(9v9ykqc qx42 olz; rdtHow far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 kmw:r 2srq7k)xv/h. What is the average speed of:) qwxkrs2r v7 the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whv4lwah;8j;,a vl*0 da1kzdigq*k c;k at is her average spe0iaj1 *dgv8cwahkk kl *z q;;,adl4v;ed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fok ;yq 8j(xitkt e9e- pijl8:i)r 750 miles. What is the average speed tiye(8 xjij kl-p );i:e8k9 tqfor the trip?

  In a 400-m relay race the anchorman (the p6 (99(/qkgs xjwfyd vberson 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 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 racej9( yxqdgskb9wf(v/ 6?

  A car decelerates uni.,qv2n 1k3.ekc7xd hbjy 4k+c n az-bbformly and comes to a stop after 13 s. The car's average vel zkea+j, v1d3hb7by kxqb4..nn-kc 2cocity during deceleration was 42 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the av8ht7zj )nufb+y b1 q5jongnoi4 f*s,4erage rate of qyitj4 bz*f4ns1 +f nn ), g7bjuooh85$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratesbu6h 5 z-bhl+-hcc jn9 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 rest and acceler1l.)9bz(y y:zh)udm bk2v ptkates 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 accelerat,u qv.btt1e;(xid nc1-te g1 sion ofx,t1gt;1 vuee1 - .(bdnticqs $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.2 m/s experij y4x)mmq na34ences a constant acceleration of 4 )3jmq4xnam y$2.1 \; m/s^2$. What is the cart's displacement during the first 8.9 s of its motion?

  A bullet moving horizontally to the right (+x dirpcll+j c+t/ /la , bi3rv8cw)jection) with a speed of 257 m/s strikes a sandbag and penetrates a distance ol3jl b,cjr v/t8)/ a+wipl+ccf 12.07 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fro5g*4 vw:k4nplnn , qsesf j82cm a catapult 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 iv*, fgk28sc4nje 4wqsn5n:lp s the length of the catapult?

  A car starting from rest moves u3kqf2cc;s e93r ck,/i 6xuhb+ we/duwith 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 l1vj ;m) xpjump162h o80 m/s in a distance of 200 m. What is its average accmpxj;mj 26 1lo1vhu)peleration?

  An object starts from rest and undergoes uj 9cwu qj10+r /+qkfponiform acceleration. During the first second it travels 6.8 m. How far wilcw f 0p+u+9kj/q1 oqjrl it travel during the third second?

  An object is moving in a straight line with constanntr9cs7gxb: 5t acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far tb: sr95xg7cn does it move during this time?

  A car starts from rest and acceleratesdm 0/de9vcmt 8 mdw;(h 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 decelerate aj *eh+.;yqy r:hz(ks zkh0 w)it 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 been waiting kc1,h0yql : osat the intersection starts ahead with a l:qks y,01ohc 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 upmv50 oa+-(-ic)bhnt g0t zhydi t2pi)ward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravit-()ynop g tit)0ath z-5h2 d mvib0i+cy 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 X8+yy-de zukyg ys *4p(/ygumi +7sp,u where the ap +ygypy(- s,4yuk8+y/ muizesdug*7cceleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surf g(j9wu47twxnace of planet X where the 7wx4wj( ntu9gacceleration 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 surface of planet X whe3sovjfsi1mv z;t a-: b8c5b w6re the acceleration due tv cb31a m-s5jb; ofsvz 68t:iwo 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. If yf0 qyg(*t/hkqx.h f;uour friend holds a ruler between your fingers and releases it without warning, how far can yoh hqgk (fx; ./qt*0fyuu expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s.rp9n7b rg 2+aqqxr0k; What is its velocity after 3.7q rb+0arqp;9 krgn2x00 s?

  A bullet shot straight up returns to its starting poyk6krf i,56y x3(3ga fko: mbgint in 18 s. What is the initm:3x 6gk,fga5( kfor k6bi3yy ial speed of the bullet?

  A ball is thrown straight up with a spv+rlu85mdgpd :ex5hv ph h:4,eed of 36.0 m/s. How long does it take to return to its starting poilhe8v hrdud:p4: gv,h m55+xp nt?

  A ball is thrown downward from the top otilakwe:bk3 8( zp*f;plic-i l 6v8b ;f a building with an initial speed of 11 m/s. Iw pb6;c zvf*peltkl3bl-(ai i8 8i: ;kt strikes the ground after 6.5 s. How high is the building?

  A ball is thrown straight up with a speed ofg ei tqemk+ wimqyf:3*l3)1 +a 30 m/s. (only fill in numerical value in y+a)+ il mgi:fq*e3t w3ekqm1 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 s xg,ax35iwp e(f*ok)x dj/,sztraight up into the air with a speed of 31.2 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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocityp52wmzp +w91pr uzoy0 at t = 1.0 s?

  In Fig. below, what is the velocity at t = hao .j*-lwm2 f/,vdfs*lr6m k3rvq/b2.5 s?

  In Fig. below, what is tx tdr +t7h;vm82hndm 1he velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t dc/;-(vqwo vyrt, ke1= 5.5 s?

  In Fig. below, what is the averu g*w,s /1fs2s bv0gdjage velocity from 0 to 4.0 s?

  In Fig. below, what is the average4 fevtuw- 73r qmj7s*p velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratio1.rp+ vn, -*azrig cvk pt-2ppn at 1.0 s?

  In Fig. below, what is the accelerationroco l4. 9lwlc6 7rqc4jpv8 ,z at 3.0 s?

  In Fig. below, what is the average accelerationd*jt( zjfbrj)bm0 + zin.3wn 2 from 0 to 5.0 s?

  In Fig. below, what is the uo 2f5z).r oz *zalqicyj8x- ;jfq8a- average acceleration from 0 to 8.0 s?

  In Fig. below, what is the xak*i w geexd00 0cm*4displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity xmxp w)niw;/2;:o ys 5xc6xre}

  An object can have a vaelr z7 /4ebkdkf3 h9ie.5vb-rrying speed if its velocity is constant.

  The velocity of an object can be negative when its acc, hglku(npw5y h6c;4j,r2e o csx7t8k eleration is positive.

  If one object has a greater speed than a second object, the first must have a gr - dypyy30s.ljeaterj y-y dls.p30y acceleration.

  Two cars emerge side by side frod,uiwdz-*..mi eygjb,/w k7y m 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 accelerax dj+ a96m2jt21nht -+dp5 gi:urkijvtion decreases.

  A baseball player hits arq,bx(h3t if2 foul ball straight up into the air. It leaves the bat with ,qr3bth2 (xfia 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, hoi;c -js o7quba( +k m*d3let-zw does it cudc k7(;smjeb-+oaz*l qt3 i-hange if air friction is ignored?

  As a freely falling object speeds up, what is happening tpi);hw.:)2l zmo6kt xtlju;bkl0 y0uush m 3 +o its acceleration, how does it change if air frict; t :0 +wmlhx).tlu k ip6)2;ubuj0m lyhs3kozion CAN NOT be ignored?

  An object that is thrown vertically upward will vc.g3u ut,ff*return to its original position ff,3u*c vtu.gwith the same speed 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 acceb.k)gpg4 -b qmleration at the same time.

  An object can have nonzero velocity and zero acceleration at the samer-qdfh4vsxm,pw. ( /p time.

  An elevator moving from the second floor to thh ft .vup8((r /f*qlaue fifth floor making no stops along the way has zero acceleration all *r8u. /l( aquvfp fth(the time.

  A rolling ball moves v,kg 3;7fdjl 5(i,lv(nq ysy mfrom $x_1=2.8 \mathrm{~cm}$ to $x_2=-5.7 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight com9k zxgynlhuu; , 5rqo6ks9.tgfb *3x- pqs*m( plete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.7 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 straigp wb-iop /,zd:eyt .i 2.pxm tj.n)1ofht line, moving 100 m away in 12.7 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculiby2eo p..twjox, ) tm-1dpi fpz:/ .nate (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 fro97 0mz scjrp l/)2ucaom $10 \; m/s$ to $24 \; m/s$ in 5.5 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 from p,apt. v)n+f 5dxytvw0 -s3on4eg-rh $20 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spldbm44r b*ae g*a4t-h ex +hz,eed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can bur t2l kkgeam; *z4oudjqf7471 bst out of the blocks to essentially top speed abou dq;4*4gb7k7k eojzau2mlf1t t $10.3 \; m/s$ in the first 11.0 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly fr/l xa w0,ak2niom a speed of $16 \; m/s$ to rest in 5.70 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car lea,cbc b s9sy:l0ves skid marks 92 m long on the highway. Assuming a deceleration of ssbc, lyc9: b0$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going x dprh 9aiczc v,+m+/krsz. 2.vxn):x $25 \; m/s$ 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 than 30.0 min. After exactly4fc 8 5uhblyxkq(:s kda:*v rdmg0n66 27.0 mi6*n cv qddxl:4hkub6f 5ya( ksg:0m8rn, there are 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?    $s$