Suppose that an object to u.; djdf,k v6f+mk2travels from one point in space to another. Make a comparison between the displacement and the distanc.tj,vfmo 2dkd +u;6fke traveled.

  When is the average velocity of an object equal tgo39 s 7fb-tk97ohziurm / ta)o the instantaneous velocity?

  A new car manufacturer advertiu8m:9 voaztmr).f.5lxui9pw ses that their car can go "from zero to sixty in 8 s". This is a description oi.599x u fl tvrzam:w)u.op8mf

  An object moving in the +x axis exp4nblfi9cmjm7t3y u/ 2kg3 cw t y2 3zcxm3ov67eriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travecnn3uf-k.4(*hnc av :.9yulkddirw, ling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its ka9(nc cw,f nd3 hnrld.-4v * uy:.ikuacceleration.

  Suppose that a car traveling to the West (-x dc. mho1x pmld7 z3j1l:irection) begins to slow down as it approaches a trafllcphj mdz1o :x71m.3fic light. Make a statement concerning its acceleration.

  Suppose that an object is moving withw :n82q.cr*h m fptyx* a constant velocity. Make a statement concerning its acceleratin2 p 8qfcrtwxh:m *.*yon.

  If the velocity of an object is f453 fdytoa jw5 .(ejczero, does it mean that the acceleration is zero? Support your answer with an exampleo4a55 .( jtwj3eycfdf .

  Can an object's velocity change direction when its accelerdy srmzkp2gms(,ud8 - .lxs *3ation is constant? Support your answer with an example m l2 k8*y-zmdp,g d3s(.usrxs.

  Suppose that an object is moving with constant acceleration. Make a staqfe0/l icf;bxk32fih,f, 9 fctement concerning its motik,f3f xq ifc;ih9 /ebf 20flc,on with respect to time.

  Can an object have increasing speed while its accu ,w:ui z e))4-bawvzteleration is decreasing? Supporuw-w))beau zzv :t i,4t your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. 9bxc5 r 0pry9zMake a statement con9cr09bz p xry5cerning its acceleration.

  Under what condition ho *hm i7uju,5is average velocity equal to the average of the object's initial and final velocity*huo75h mui,j?

  Objects A and B both start at restvumc)2i /zb3 v. They both accelerate at the same rate. However, object A accelerates for twice the time / v3uivz)cmb 2as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at ti9 /h vfs4(h-4g ctwwvse :6mxhe same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that xwev:h 94/ -iw6fcg tssv4(mhof object B?

  When an object is released from rest and falls in the absence ofty5aumc0-ue3 d b1 x8f friction, which of the following is true concerning its moti8et d5 -cbax0m1uuy3fon?

  When an object is released from rest aukrz ;k(* x3s (9fpdupnd falls in the absence of friction, which of the follopfs (ukz;9pkx3* udr(wing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocit;dxw)cka ck tq/s, kc2 :em6 4soj:ag;y and the acceleration when the ball reaches the high,a/k dk s;q2c)gx e6c;tmajo::s k4c west point.

  Suppose a ball is thrown straight up. What is its acceleration just before it rn /5-hhsef qd0n t96 92jvqrugeaches its h2u n 6t vj9nghesfqr/05h-9d qighest point?

  Suppose a ball is throegl + p8qvej;36 jxu3qwn straight up, reaches a maximum height, then falls to its initial height. Make a st q;e+gxp8j3v6j3e ulqatement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxi6.ylmej,x7k9w-hh ut mum height, then falls to its initial height. Ma9-jew. hu mltx,h76 ykke a statement about 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. M5*oztp ;v)is qr,(mlkwt 6 r-make a state* rz(i; kv)ostlwq,m6t- rp m5ment concerning its acceleration.

  Suppose a skydiver ju,v8, oi fp.g wpqi )l0uuvfp;5mps from a high-flying plane. What is her acceleration when sheg p.viqoi fuu)8pw0l;5p,, vf she reaches terminal velocity?

  A ball is thrown vertically uk, :ffyl aq36zpward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many timesk:3 a,fqf6yz l higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ew,uzst3vc q jm *j42v g2:(sbball B is dropped from the same building. As time prs q:jv,4zs2 wt2 j ceg*m3b(uvogresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is. myilg y4lyx 0,*cn:v dropped from theli.cmgl yy,* :n 40vyx 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,); 85qeh,q4 q.5ubrxy lhuyv y and the other is thrown down, both with the same initial spev . uby4ueqqq5hlyy h8,r;5x )ed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A seconoi9 qdfuxwt 8 j;:n-.32stz nqd brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare tnqi9j-t xwo83s ntd :.z 2f;quhe accelerations of the two bricks.

  An object is moving with constant nonl+e ;h n8(mgra29vwl 1 e0fiic-zero velocity in the +x axis. The position versus tim;0wlf2 (i+ ianre mlc9 ge81hve graph of this object is

  An object is moving with constant no0mu7xiv a 8.)v93b0z6 ldrcl+nc zj fan-zero acceleration in the +x axis. The position versus time grap9iv007m+ za. fxnj z8ucvab rd63) lclh of this object is

  An object is moving with cons*4no8o e -syjc7r.yg9e( s g;wf*r bcytant non-zero velocity in the +x axis. The velocity versus time grebs cg w8n*oe (y4y9*-rosyr.g7 j c;faph of this object is

  An object is moving with constant no, cyr2nc3*z e6nzh0x+ft.kgs-+dv wzn-zero acceleration in the +x axis. The veloc f6 n vgw+nhrd*.cxzsz+-ty,e3czk20 ity versus time graph of this object is

  The slope of a position versus 2p/lxg cs3) qq(gzhh;time graph gives

  The slope of a velocity versus time graph givgd zqq-, s4ovs dxi+.*-k(rofes

  The area under a curve in an acceleration versus time ghy81 2xccco4kq c0l p,raph gives

  The area under a curve in a velocity versus a7kl48ocpb5gvx faz tf1t.e,5y8: j ptime graph gives

  If the position versus tim;4 tipb2 u/ffue graph of an object is a horizontal line, the object is2u4bff/ti up;

  If the position versus time graph of an object is a vertical line, the object i5j+ndy*hi+ ooqec 9- rmd-;qasohd;nayi9-*eqo+ q+ 5 rd-c jm

  If the velocity versus time graph of a n)l j4 .kvl; o.tl*7qzqqpo6qn object is a horizontal line, the object is k.voj 7ntq l6lqqloz; 4*.p)q

  If the velocity versus time graph of an object is a straight line making an4x fe.ca 4rf1bmh(o vq48rk6 s angle of 30 degrees with the tikfh oesvrq 48bm. fc4(rx64 a1me axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the d j,je eunpi5-)y4yl9gg fh) 6bistance traveled and the magnitude of the displacement veeey,fujl i9ygn )j64gb p h-5)ctor.

  A boat can move at 30 km/h in still water. 2rfl36c6e uxzu0.n q6wrb*e qHow long will it take to move 12 km upstream in a river flnw0* r23 q6u xb qce.6eu6frlzowing 6.0 km/h?

  55 mi/h is how many m/s? (1 ccvv gd)d9z6;l+b u9 oskhg12 mi = 1609 m)

  What must be your average speed in order to trave3j09q*i(rkt erz ;)c6z,wd5wnowymkl 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2zpe -;5vnsq/0van48ll5 ggrv hours and 57 min. What is the 8v/vpelv r-05gs5; q4nzgn alaverage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travelx nh6t,y.12gls:r)* 0jbw ,y achrwct 400 km?

  A ly (light year) is the distance that light travelfprdnc-vp- +9oobr 82 s in one year. The speed of light is -por98dconprfbv+ -2 $3.00 \times 10^8 \; m/s$. 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 sidv*,y-s 45ma 1r ema1-jo fxgtce for 4.0 s, how far 4mav1x,1toj c-*sy-ga fmr5 e do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 2j7 jysss6mp3m), in 100 s, your average 3 jsym6sjp72svelocity is

  A polar bear starts atlust8hl65w 5 6znsv8tizy (b(m ; h1lf the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to vy8il(1(s5 8u; szm6 zllwftnt5bh h 6return 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 1.0 km south, then 8;9ee3b5dcoj;i, cqj l9 q 602ejhgn kmh6yj c1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. Thce8 y0 b jo, jgdijhnc953klq29;c ;6hemqe6jis 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 ths2t/3uqbman/( 0b rqpen starts to snow and you slow to 35 mi/h. You arrivqa3/0n q trub(/ps m2be home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h ocolr5f9u;2)nsa+v9 .lkt rhand 160 km at 100 km/h. What is the average speed of the motorist for thtcl;o2+ 5s.l)o9 u hvk rnfra9is trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her avef/93 r,u lzcqk6vlk xv 5q0qr.ra x0lq vz5r9r/ c,ukvf63q .lkqge speed for the trip?

  An airplane travels at 300 mi/h south f sadx 5-i py-eiy2rs;-or 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for thyi;---ayxp5s isde 2r e trip?

  In a 400-m relay race the anchorman (the person who runs txpl4e+,j hyt gh9:*9n( zbhg qhe 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 t,hqg4h9x* gjz+hp lnb:9y et(hat the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop aftekx5g97i j n3nl5w1l u(w v3h0;pprrlqr 8 s. The car's average velocity during deceleration was 63 km/h. What was the car's decellh 9q pp nxr5v7ujkr3nl51w03lgi;w(eration while slowing down?

  An airplane increases its speed f+0sfbc +x 2 nx;4lw09if t6 zusfsgxg5rom 100 m/s to 160 m/s, at the average rate of x90sb+0l6f x ;u4fz5nwsisc + 2fgxgt$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of3 6js8bc, jj+j ypwnt/r4iix) $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest tha(5nc43pxband accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then (o2gzx do esc:+yuph08 eo;6d6g-uvs speeds up with a constant acceleration ofe(h:6g0xgu+ -csz;eduvp 6 dso oy 82o $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.6 m/s experiences a constant 7la;zd rckj 8ruod +.(acceleration of u8c dza ld.r7jr(k;o+ $4.8 \; m/s^2$. What is the cart's displacement during the first 8.8 s of its motion?

  A bullet moving horizontally to the right (+x direc54*yeiymm.k 4xz dqb.tion) with a speed of 311 m/s strikes a sandbag and penetrates a distanceibm.y m.z4 kyx4q5*ed of 60.52 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapul j c)xd+2d p./b6c64watib lhgm4o(nrt on an aircraft carrier. It reaches a speed of 42 m/s at the end of the i/d4ma6.t wx + n)h4blr goj2bc (dc6pcatapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with c ((2ztqdhnna6 -- i3wkkz7sc a.avn/ donstant 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 scm fskml e43. w+fgg5yf.p9 )its average acceleration?.k sc9gmpe ws35ff).4fyml+g

  An object starts from rest and undergoes uniform acceleration. During the firstxfxzc)0;c3inxmkb1upkgit6 kev69z*sr) 6) second it travels 7.1iux9ks cn6z)xgect6fk6*xrkp)z0 v ib;3)m1 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initially t-c7nfx td /b3p kqck*be:-lh0h4ke2 it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during thi- 7 cfp txbk0k24cb-ne:h qkh/3*et lds time?

  A car starts from rest and accelerates unifop)t *kv9lzmp;/py 3nb rmly 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 sh x1f.upk9l0 on a dry road 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 green, a car ko7tlt0b o ( be6fstpe +./9jythat has been waiting at the intersectio+ s9lpf.y e(ott 7j o6tebb0k/n 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/s on the surface ofz9/ hstubt:9s/lz4oh( go8r 8i o,dzu planet X where thh/l98z o rh8osts b zdu9:tiuz/,g(4oe acceleration 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 gpq tgx6 f;;8d12 m/s on the surface of planet X where the acceleration due to gravitdq8;g pxtfg6 ;y 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 onz:1q0hjc1d wo k4yos) the surface of planet X where4)w 1qo 1zj: ko0sdchy the acceleration 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 s zue75x4g:wsiurface of planet X where the accelerati :xus wg4z5i7eon 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 0hpf7ig 9v 8 ww(p 5l(dl;zf1zbv obr/9.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect8zz7b/;rh1g(wpvf plod9v5 (wlfi b9 the ruler to fall before you catch it?

  A ball is thrown upward at aq+55cba s evo772wi tq velocity of 19.6 m/s. What is its velocity after 3.7q7s etq5cvbo+5ai w200 s?

  A bullet shot straight up returns to its starting point in 13 s. What ifzt 4cqq06l qk0flaxv2+l ez gs0s3 +,s the initial speed ofgzs+qle vtx42 c ,00 qaz0qfl3l6f s+k the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take ggn x6ynk3;lv3 6)w mg /ljm0yto return 33v;wlk y) 0x6nlmgmyg gn/6jto its starting point?

  A ball is thrown downward from the top of a building with an initial bi) kqhd* tuu/, ru;1 0djgb+nspeed of 7 m/s. It strikes the ground aft,i*buhqd jtrg; b)unku+ d0 /1er 6.3 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeri3su ;rapmk m.ak 0/ u(vlrk,e:cal val k l;0ausrvm./(,e3k:u kpamrue 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 stratb( h m)/q+zg7:xg qb9u yi+diir/lu1ight up into the air with a speed of 26.3 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 13 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.vmz :+qu* )frfebwm6qfn /-p 50 s?

  In Fig. below, what is the velocity at 3tv.ld1f-,i9htmh5eeea :be t = 2.5 s?

  In Fig. below, what is the velocpixcddi(9( e3 ity at t = 4.0 s?

  In Fig. below, what is the veloc8shkij2g-i p m4cbn, 5ity at t = 5.5 s?

  In Fig. below, what is the average93ocq :fap d8a velocity from 0 to 4.0 s?

  In Fig. below, what is the average velnkfdbg q7yq,/t (3ezytlnq, 17+lo 4gocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.we k9j4as*: dqpe5q3 w+h8ostgslk+) 0 s?

  In Fig. below, what is the acceleration at j,plc*oey(p)uz g9 f+2zyjcl8)6i s z3.0 s?

  In Fig. below, what is the average acceler* -zj/y gotqg1ation from 0 to 5.0 s?

  In Fig. below, what is the averagxj +k(z/ed y6ve acceleration from 0 to 8.0 s?

  In Fig. below, what is the displaq,24 i-yutrx ilo8u o9cement from 0 to 8.0 s?

Does a car speedometer measure speed, vel0j : oc0fq;tbjvq 2m*wocity? {speed|velocity}

  An object can have a varying speed 7y-q 7r: 47q7zbl)xd ojmqtre if its velocity is constant.

  The velocity of an objecf- v/ozhr)dv0 t can be negative when its acceleration is positive.

  If one object has a greater speed2ep dq(p ;s 8rxo-(ngz than a second object, the first must have a greater acceleratios(o(d8pp ernz x;g 2q-n.

  Two cars emerge side by sideozyag fy0z:yh2hv/mzsqas,y *p,7 3: from a tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed as i)(jfrj4kjg j /dwy3a -ts acceleration decreases.

  A baseball player hitaq5 kfppf (/-sqfif*j 0q0*kf/*aga4 er )zfks a foul ball straight up into the air. It leaves the bat with a speed5fq/ e-ak j*af)i rp0* zkf*qgsqa(f/pkff 40 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 cia0px dny kc+gn 5q7*(qo 4p,speeds up, what is happening to its acceleration, how does it change if air fricp54 c(n,d*0 oyc i qxnkpa+qg7tion is ignored?

  As a freely falling object speeds up, what is happeningfd, d7;* hzela to its acceleration, how does it change if air friction CAN NOT be ign ;zefl7hdd,a*ored?

  An object that is thrown vertically upward will return i5t*o:a e0un9nvsih53 owy7 l to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, hnn hoy5:7eu3o0i9 aitw * 5vslow will this result be altered?

  An object can have zero veloq)iwd/q br d/v; ppde6 la6;jx):-gzacity and nonzero acceleration at the same time.

  An object can have nonzero velocity ax m mc6n13m* +naooi)cnd zero acceleration at the same time.

  An elevator moving from the second floor to the fifth fl3qt lifms3 k(sk/lykt 7a6r 8b,mg- lwjb/,:goor making no stops along the rblk6 8mk7itl l/tqs/y,(: ,bm w kf3g-jg3 asway has zero acceleration all the time.

  A rolling ball moves froof ,90xu q+kkym $x_1=3.3 \mathrm{~cm}$ to $x_2=-5.2 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.3 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quart 2qv/4 +2oz p auffp8;ahrz7szer-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.4 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 86qczf ey52 0l+m m away in 13.qf0m5+cz2el y7 s. It then turns abruptly and gallops 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 frol3z,m2orsd 3z z45v7 cys ,fp9k v6ebpm $13 \; m/s$ to $23 \; m/s$ in 5.0 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 fro09gnmq v oe23v(87bisv kh. bem $19 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spee: :c8 s7,by i1b3geirqrv)sc od of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of t g4 :v2q9a2nusg q8txf t::vehhe blocks to essentially top speed about 8s 9ntqguqxage:v :22t f4vh:$10.8 \; m/s$ in the first 14.5 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 *vfvy8ooz h84a speed of $19 \; m/s$ to rest in 5.52 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the highway. h- eh;nxyn1gd3qr nip5r, 0) p8nock +Assuming hh8g; ke3+q 1nd5p0n prn, yi rx)co-na deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gspgofl :59 ac :gt+u2toing $25 \; m/s$ 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).    $m$