Suppose that an object travels from one point in space to another. gws si 3iq+p.t, plh y16-fr7cMake a comparison between the displacementr31 ig6s7siw,-pt ycf+h . pql and the distance traveled.

  When is the average velocity of an object equal to the instantaneou vi:pf/usk/(8 asv(azs velocity?

  A new car manufacturer advertises that their car can go "70 pf/(fmf fa8a8 mprbw7e0bwk3;y bh f(n-llfrom zero to sixty in 8 s". T/(3hablpnw0fa;lb88 f bm f w f7f-0 ek(yrp7mhis is a description of

  An object moving in the +x axis experiences an ac r n*b.pfg oasxg1lqzp*;5+vr dnj(97celeration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travk)*p xj++vt ,w4h cjrq81nypyeling to the East (+x direction) begins to slow down as it approaches a traffic lig j ,k 8ph*tp4+nv)qry1wc+xyj ht. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directio h ztis2(kmqd9ir )e5v+gv1v,n) begins to slow down as it approaches a traffic light. Make a statement concerning its accelerationvq5,r v +s im dv(h92e1kg)itz.

  Suppose that an objey41a ci;7 nektct is moving with a constant velocity. Make a statement concerning its acceleration. 4ick1ny7e;t a

  If the velocity of an object is zero, does it mean that the acceleration is z qb85qp6;))7 omuuuvaey0 fjd ero? Support your answer with amyj ob7vp5q80;) 6eq)uduafu n example.

  Can an object's velocity change direction when its acceleration is constant1 auhsa*b5ze 3jm d1o9i.v)xp? Support your answer with an exam im. o11zj3x9dbhvu)ep a a5*sple.

  Suppose that an object is moving with constant acceleration. Make a stat r u a/)1t ;qq9nbo5shlg:rf3pxxu i9)ement conc 9qt5)sa:n)pu9h ru;/f1 obqglxr xi3erning its motion with respect to time.

  Can an object have increasing speed while its accelerationdijp6 edowks50 6csmw - .t ni(rq;j16 is decreasing? Support your answer with an exampli d .6i1osw-; w5p qj 06kr6smdje(ncte.

  Suppose a can, after an initial kqbj(8 -hdx;marlh11 hc 5v ve,ick, moves up along a smooth hill of ice. Make a statement concerning its h,ea mhvv dh5(x clq1-rj18b;acceleration.

  Under what condition is average velocity equal to the average of the object's inl:/v qs4bc1vb t/,fokitial a4,/lftscb:b1v / ovkqnd final velocity?

  Objects A and B both start at rest. They both accelerate -d1thiyl(a)n 0w8:ktg0 y y 6ebbuop0at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of ob)ohbb du yyy w 60t01-ae0lit:(kngp 8ject A compared to that of object B?

  Objects A and B both start from: dt1rd)eun :dcnld 0/ rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that ofdedct: /rud : 10n)lnd object B?

  When an object is released from rest and falls dz;uo2 o pn+e+in the absence of friction, which of the following is true concerning iznpue ++2oo;dts motion?

  When an object is rele.dege:0zipnpi:y/wohe.t/ h l7i *m 8ased from rest and falls in the absence of friction, which of the following is true concerning its moti lp/w7zh d*e.miiep.oeig h:0:/8n yton?

  Suppose a ball is throwd il/w ugm+ *1*xbl rz+q6gtp9n straight up. Make a statement about the velocity and the acceleration when the ball reaches the hi1 m*ui9 /l6t+qb+xg rwg l*pzdghest point.

  Suppose a ball is thrown straight up. What omjf6fe .rjd0(n3s qb rx/5jlci*) b( is its acceleration just before it reaches its highest point? )dcf(bq .j(or0jn* 6m f5r/siebj3l x

  Suppose a ball is thrown straight up, reaches a maximum height, then falls we-1 c(3vinm)6zf w yhto its initial height. Make a statement about the direction of the velc- e wi6(n)3wzhmy vf1ocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a ma ozcyc*e* oc /129gwg 40wbjgkximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is com/c b 4o y0wec j*gzc*2w9ogk1ging down.

  Suppose a ball is thwqbpo2; njyq h23pj*a)) b6 (t,i0xjklthv6crown downward in the absence of air resistance. Make a statement concerning k262qbcwp3 y;t)ahbl,0j( jj x *qv )pin 6thoits acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wha3v*(bq4tc jny hl)9rst is her acceleration when she she reaches terminavt3yhs9cqlb rn ()4* jl velocity?

  A ball is thrown vertically upward with a speed v. An ide)huncf(e b v,-dm/,zpntical 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? (Howcpu-/be dn(mhzv,,) f many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buildin j x hmsr iqx(z:/romt)7cc508g. One second later, ball B is dropped from the same building. As time progr7 m8cms0tr):o/x(i5h jx qrz cesses, the distance between them

  Ball A is dropped from the top of a building. One su/y69lbtxn n)l34 fsjecond later, ball B is dropped from the samlsuy xj/t6 9l3f)n4nbe building. As time progresses, the difference in their speeds

  Two objects are thrown,rznf7w;0fn rg ,*:p3cogwd x from the top of a tall building. One is thrown up, and the other is thrown down, d;0fz npr g7: rg3cw,x*fown, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is lp49 -a35tgihrtqp c 3thrown straight down from the same building. They are released at the same time. Neglect air resistance. C39t3 qptcail 4hpg-r 5ompare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x arvi/gkyn.)9x 28vjj u6 fve8yfbc c+3xis. The position 38ne869 vk/ cu .vy+gvf jjfrxi2byc)versus time graph of this object is

  An object is moving wvlh-*bjjrbbg 2njha/ 9se; o 6rikp .-wmm:)2ith constant non-zero acceleration in the +x axis. The position versus time graph of je mp2bsknlo2ib/ j6:j9bh -;wr. *v-)ghm ra this object is

  An object is moving with consiroq0(l l :b*dtant non-zero velocity in the +x axis. The velocity versus timer: oi*0lldb(q graph of this object is

  An object is moving with constant non-zero acceleratiolut o- *l ;5m:dsss:ujn in the +x axis. The velocity versus time grs::t s uo-*lm 5dl;sjuaph of this object is

  The slope of a position versus time grap 6s,q2rrv4y; h3ccgxda0 ;jceh gives

  The slope of a velocity versusw3l- fa j,lng r5kfw.81,rx6bpk0vii time graph gives

  The area under a curve in an acceleration vers2b,d3+ez a mmx6pz z8lus time graph gives

  The area under a curve in a velocity versen 0o(v1:x yodd5 fb j5w93twbus time graph gives

  If the position versus time graph of an object is a horu- /q3rzzz0isx;+vogp-cfytig7 z ;5 izontal line, the object i +gygiof;7-5p tvr z-zszx0i3/ uz;qc s

  If the position versus 73 lk6k6gqqprzz fcfo-/b p6-time graph of an object is a vertical line, the object isp3 k7op6f6zlzr--fqk b/gcq 6

  If the velocity versus time graph ixg pp au.sc)v6c dc. 34cp3g.of an object is a horizontal line, the object isdpi. sgc.cguc. 3cpa63) vp x4

  If the velocity versus time graph of an object is a straight line making y;;c zde/v2)b 2z b wijqke6hxz)mc ;4an angle of 30 degzxkj;b4y eq 2 z )zm );/6idwc2ehbvc;rees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find b9k*cj+0-px9; yu2om p mfo cgkoth the distance traveled and the magnitude of the displacement vector.o;x*mfc0pu m 92 +-yc9ogpkjk

  A boat can move at 30 km/h in still water. How lonv fyll.bdit5 8k1:9 dtg will it take to move 12 km upstream in a river flowing 6.5:tdf lly.ktib1dv89 0 km/h?

  55 mi/h is how many m/s za6wg bq *6g7,kzzc-p? (1 mi = 1609 m)

  What must be your averageb8nx5o/ g/c4*r (; ylgcur pjaxkh+g3 speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximaterxr j2gl yllx n(;-sl 5svv;+9ly 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s?j;ls ; v-gr2rnx 5l+9vyxll(s

  A car travels 90 km/h. How long does it take for it to travel -(s +ptjq3:jtsac6 0jxt 8wpo400 km?

  A ly (light year) is the dosgkse( eup+qv f*: .0istance that light travels in one year. The speed of ligh: svk(o eup+fes.0 gq*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 roy j(ekm q/i5k-ezvh 9*ebn9v *2 ycy/lad and you look to the side for 4.0 s, how far do you trave/9zqbiy(e vkn2*9ej h/-ky l*v my c5el during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, v+ wy :ry-f*4tciiqw- your average velocity-*:c +wvii-qw f4yrt y is

  A polar bear starts at the North Pole. It travels 1.0 km south4w2l1-ir y xmd, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takwy rl4 -2idmx1es 45 min. What was the bear's average speed?

  A polar bear starts at the*7dtaxice 9y/ North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km e/y*ic9 adxt7west 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 5xcct+t- ur91 vkmy ,c)5 mi/h for 110 miles. It then starts to src-1tct u+xy9vkm,) cnow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 b lcb(rs/i67zkm/h. What is the average speed of theib76bzl/cr (s motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her bhhcg )ud p ti* xhv5j7q)tz -v5s55x+average speed f5)huvv +sx7g thzitd5b*5hq)x jp5c- or the trip?

  An airplane travels at 300 mi/h south for 2w9, 5yk 5ltf6rtt hi4p.00 h and then at 250 mi/h north for 7f5,ittr w l6h9k4yt5 p50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchormq9y:rlu0vt1 y3/ rpftan (the person who runs the last 100 m) for team 0:3yft 1p 9y/lurvt rqA 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 race?

  A car decelerates uniformly and comes to a stop after 13 s. The car' fe5-mxnynn0 p9hgh8 )s average velocity during deceleration was 70 km/h. Whay95hp x -0hnn)en8gmft was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s9y(az n uue1z4 to 160 m/s, at the average rate of 49eu 1(zuza ny$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at theg2mrjlv*v 9oyoo+nmp)o7q8 m ke.a18 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 accelerates kvu3jpo sn(4 kia .f*9at $4.0 \; m/s^2$ 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 u,g+ iadc u/pxw+f9(xconstant acceleratiofgud+x+x /(,w ci9a pun 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 6.8 m/s experiences a c i4hqi+;(f5ptjw v h5vp4dz wlz62f+ qonstant acceleration o5 zpwh2ivfq; (4ihj 6dtq+w z4+fp 5vlf $1.3 \; m/s^2$. What is the cart's displacement during the first 5.1 s of its motion?

  A bullet moving horizontally to the right (yi.ap )(k hh8 gmps+iqyu557j ms6 xg2+x direction) with a speed of 344 m/s strikes a sandbag and penetrates a distance of 57.70 cm. What is the average accelerat si2 (8+6mhk)i gsuyp5ypq5m7hjxag .ion, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fromvgvt8y cbm55px :)a -v 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 is the length of the catapultgxvapy 585 vt-vm )c:b?

  A car starting from rest moves with constant accrnqz0 ; phdcg-a*5n6sdee cs m+qv+ +w+63piweleration 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 alt6m fm/ s23pq distance of 200 m. What is its average acsp 2t6mf/qm3lceleration?

  An object starts from rest and undergoes uniform acceleratb/ r *tniohxl)y/, wo*ion. During the first second it travels 5.4 m. How far will it travel duri/ ,*ro/)wl ho*nbtyxing the third second?

  An object is moving in a straight line with constant acc 52mmz ;w8llmx zrf m2c; m+rx4p*p(qeeleration. Initially it is traveling at 16 m/s. Three seconds later it im mrx*8mmz5c;pqe;lp2w 2 rlxf4m(+z s traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates un- um;sxje1 oqd 1e-0rhiformly 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 ot(qdsp nao/vqxb7myug* 3w57 - fq51en 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 that has been xou2oe.n(pyr) tuf )n)77o c cwaiting at the intersection starts ahe) y)ou7nco)oe2nr p(. 7cufxt ad 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 tha 0yoa1l5mbrunc1cgd:594cv0 uk z3x e surface of planet X whe:3luuc1 1 g95xoakzvm5rbya4dncc 0 0re the acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speedqlgk42hk7a2 /*o mrvn of 12 m/s on the surface of planet X where the*m4q 22 lo7nkakr/ hgv acceleration 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 off 5x mx 9.hd9vrazfp0a xx5-ax;(mc/y 15 m/s on the surface of planet X where t0;f-5 5 xx9cyf(rvd apam x/.hmz9 xxahe 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 spee 0w*hpfg-npsj i.+x w4d of 14 m/s on the surface of planet X where the acceleration due to gravih -n4.pwwsgj*fxp0i +ty is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usuaryvx7 001o zd*xu/yob evei-;lly greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before youeox-vdb/u07*rie;v1 x yy0oz catch it?

  A ball is thrown upwari b1jsrq1qd5l/ o8r5 wd at a velocity of 19.6 m/s. What is its velocity after 3.005jqs1dr5o /r1 wq8bi l s?

  A bullet shot straight up returns to its starting point in 8 s. What is the inim1u ff z+k:kfp-gi6/lgusf: .k zof3+tial speed of the bullef1fug+ks+/f:3f p.il-:kou6fz gkmz t?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take tosyf,m, nn9gp5 return to its my 9fps5 ,nng,starting point?

  A ball is thrown downward from the top *8vx k5 uddx-g0y 1dtxw4bn n)of a building with an initial speed of 12 m/s. It strikes the ground a5v8-dg)nbd0uxx4 nwt x1kd* yfter 2.4 s. How high is the building?

  A ball is thrown straight up with a speed of wgu,h0zk 4x v 0 8z dnbibe;c-.k7jc5s30 m/s. (only fill in numerical value in thev,n70b-gczexh kd .zcuwi85s4j k;b 0 blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up into the air with a speed of 46.4 m/snpqrwtd t ro5- .lmq1y4i g*: r8y)f3y. (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 ivc5e 3u) bnxy)s the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 sgi 3fizpjo3i0+w 0) osb /0gpa?

  In Fig. below, what i6g cgg,x9gu p8lmkw r 93efy+8:o+fdss the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t =:96n bvuiia xlgk8h:0 5.5 s?

  In Fig. below, what is th gih;x;usb tzo) kv4;9e average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fr(rmv((-r)nbhx uvy x i .hr c(5+5shixom 0 to 6.0 s?

  In Fig. below, what is the accel fs*:0/ptccw heration at 1.0 s?

  In Fig. below, what i(yszgs4rm1mt mx6 mhp69 (nv/:sdv)y s the acceleration at 3.0 s?

  In Fig. below, what is the average a7 0h3;6fdzun0 xp ajlmcceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tbu5py-2:na)yugc-* n jeeg h)o 8.0 s?

  In Fig. below, what is the dtho8 i7cx,r o7fg (qe7isplacement from 0 to 8.0 s?

Does a car speedometer measure spuq, izn(i wb,tk 0*4cweed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constant. 5oj de )yby ,5x.ujoymx44:jt

  The velocity of an object canjpw (gkka4w77 be negative when its acceleration is positive.

  If one object has a greater speed than a second t 2 kq mivi ,;oj7m9+g2lotbw4d)niz- object, the first must have a greater acceleji4q 7tz;ik om)lt 2mg ,nvb-29ow di+ration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spee pf t;mddc(e( ed(uffz:ix.)b4vr/a 0d 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 acce1-jj 9yf,- o.uva/m.rbzlrkxpi+2 nlleration decreases.

  A baseball player hits a foul ball str .ee ye+jrj6n,2i*a hyaight up into the air. It leaves the bat wit+jerjey2 *n.6,ha iy eh a 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 happen 6vh o4.jjvz*aing to its acceleration, how does it change if air friction is ignorevhv.a 64jz o*jd?

  As a freely falling object sper.-uue)2z9aanq( m as g do9)zeds up, what is happening to its acceleration, how does it change if air friction CAN NOT2)zauarz- msn u9qeao9) dg .( be ignored?

  An object that is thrown vertically *h2.s m-fy+o qaoy+-;mog0 e bztj.qbupward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistfo.m-2 q*te0a bsoqh+-gj;y+ozbmy .ance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same t1q le4c m49us+ena xb6ime.

  An object can have nonzero velocity and ze15+: sod cvg oc:7dpwapt/2gvro acceleration at the same time.

  An elevator moving from the second floobh,,xx08wu8 c0y hjec r to the fifth floor making no stops along the c00 hwx,bh 8, c8ejyxuway has zero acceleration all the time.

  A rolling ball moves fry2yz x bh- 0x-2mjhw. 7xo;mgvom $x_1=1.7 \mathrm{~cm}$ to $x_2=-6.7 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.8 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cohft01js;-a-ov+pk6 w:ho wrh3th*ir mplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.7 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, mo b/o ;)eaj8ubi2.jtaf ving 98 m away in 13.7 s. It thoj)jta e/a2b;fu8 b.ien turns abruptly and gallops halfway back in 4.7 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 from4b i7bp8-q6qiiy 9o-k f8 iiae $10 \; m/s$ 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 from ;; t 3wc q0r:ow2oulfw$17 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachyjo,g11(zfb y a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the bq;bqvn. b5;wa locks to essentially top speed aboun .qbv 5bq;wa;t $10.7 \; m/s$ in the first 12.5 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 a speed oeh(as v2 f:b)(i l+o0ubpx ng7f $18 \; m/s$ to rest in 4.06 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marl ij by)jl(66gyz8; fwks 92 m long on the highway. Assuming a deceleration of 6( l6lyb giz)fj;y8w j$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g0 3qm1 kyx1xqtlt*qa5oing $25 \; m/s$ 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 * 2fxeik 9s9 d7ykre8ahi;)pp10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go89ip2;e7hfkdxe ka i* )s ypr9. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$