Suppose that an object travels from one poif c-w9t44 d; 5 pm dmqodgbar:i14+jufnt in space to another. Make a comparison between the displacement and the distance travelo4duc9qfg4mw mjtprb5d1 +:dif -4 ; aed.

  When is the average ve:uvml :.3 (u 27aewamwp0htbulocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty inlt51ig5t ou,) q5x 9b zstopr; 8 s". This is a de5 gs5up5r, t)q1;tobztoi9x lscription of

  An object moving in the +x axis experiencesi1g da0,esoxn jc0d l+pkk*:/ an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveed z2x*8 cppy2ling to the East (+x direction) begins to slow down as it approac2 dyx*cpep8z 2hes a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x 4 qq3n o .agphke(*uc/p)7 4qdb7fhwa direction) begins to slow down as it approaches a traffic3/qad7h 47.(q pch fegn4ouwbq * )pka light. Make a statement concerning its acceleration.

  Suppose that an object is moving wi,5ku*/ dqa;uhccb:dad7mu j 4 th a constant velocity. Make a statement concerning its accelera/ :*c;dua,uq bcmhad4u7 kjd5tion.

  If the velocity of an object xigdizin p6+8,r*zs b1ag9,f is zero, does it mean that the acceleration is zero? Support your answer with an eg nz9z ig, p*a sbi61i8,dfxr+xample.

  Can an object's velocity change direction when its accelfz 3rpmg1 x1k 3oxh3/ueration is constant? Support your answer with an h3uz3x1p31fgrx / om kexample.

  Suppose that an object is moving with constant accelrw jy6d u+*fgk 3* ,gqiwmy 1/d6hxxj7eration. Make a statement concerning its morf gmq 7/*i x6jwu3g +,yyd* 6wh1kdxjtion with respect to time.

  Can an object have increasing speed while its acceleration iy/jq::zufy f4gg 6nq)s decreasing? Support your a:4g:/qjq )zy6 ufgnyf nswer with an example.

  Suppose a can, after an initial kick, moves up along a smoothwh6e6yiza48c 3if/egbo c s)0 hill of ice. Make a statement concerning its acceler bieh3ego0a i8 sw 64c/c6)yzfation.

  Under what condition is average velocity equal to the average of the obs.6nsb fvfu6 8ject's initial and final veffns6usb8.v 6 locity?

  Objects A and B both sta and82d je+1/vub: jxmrt at rest. They both accelerate at the same rate. However, object A accelerates for tw 1j vxe/dj2+ mdban8u:ice the time as 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 botl wgfiju :1kp1.s qc;8h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance travel.j c:kqps l;uw fi181ged by object A compared to that of object B?

  When an object is released from resttzru+t2:i u ,0-xc2tn yu sle( (mljt3 and falls in the absence of friction, which of the following is true mu,l tz+(syt(ltiu r-xt22:c0n je3u concerning its motion?

  When an object is released from rest and d a-w (2/a.j5 ew3xgim4)vmoon.qmfqfalls in the absence of friction, which of the following is true co(o m/jaq 2 q4wmvnmd5xa-e. ig3 )fwo.ncerning its motion?

  Suppose a ball is thrown straight up.u69agkmo3 as p77uxbwf:ii9 +rvw(7i Make a statement about the velocity and the acceleration w( 7g9v:ii6u7bmf+ kr 97xs oua a3wwiphen the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is it c -ibmck-g18z(.azkzs acceleration just before it reaches8 czgk(zkm-. -c1bzai its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallnfla 4 :t :bksn4-j/zgs to its initial height. Make a statement about the direction of the velocit4n: jab4kt zs gnlf:-/y and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then ,to/0yv;j*mm6eeq nsfalls to its initial height. Make a statement ;mee,s6v/ *0ynjqm toabout the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absenccebpo0bx il1g. 4:0 tce of air resistance. Make a statement conccp. l 40gt1b:o cxbie0erning its acceleration.

  Suppose a skydiver jumps from a high-flying pnf 3q6k* v2yba.rq4zb4,a u .doved9o ( bwg-dlane. What is her acceleration when she she reaches teyun9e.d.baa brqobg 4* qf2wdz4d,v6- kv3 o(rminal velocity?

  A ball is thrown vertically upward with a speed v. An identical sec-pvqnnfl5): kfo ma+5y 4hbd .ond 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 theh+lf db4n kn5a-)qfpm5y o.v: first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the toprns7u m3b0os + of a building. One second later, ball B is dropped from the same building. As time progresses, the dist7us3srn o+m b0ance between them

  Ball A is dropped from the top of a building. One second later, balm4o 8 99,+ gbo;lp 5,yvuj2mlnqduuhkxfan 86 l B is dropped from the same building. As time progresses, the difference in t v,98lym gka5;qdj4 u ,fbuom2ouph9xnn+8l 6heir speeds

  Two objects are thrown from the top of ro4pq;wv *+),jf cxjqv4m j )ua tall building. One is thrown up, and the other is thrown down, both with the sa;v j4 ,uj qw4cjx+opf)q*rv)m me 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 mh+ ydr2j u/g/r. 2oichm 8ou3thrown straight down from the same building. They are released at the same time. Neglect air resistance drcu y3oom8 hj2hm gr/i2+u./. Compare the accelerations of the two bricks.

  An object is moving with consta yajb 1y :aj,bc8g8e:rnt non-zero velocity in the +x axis. The position versus time graph of this obcy aae:jg8bj1b ry :8,ject is

  An object is moving with constant non-zero acceleration 1+7w)qtln 6v: mpr zlsin the +x axis. The position versus time tq 1 :v7lz)slm+n6w rpgraph of this object is

  An object is moving with)3 : duj y :u y69d zz-(yhkz+xtbnambu3d8k;h constant non-zero velocity in the +x axis. The velocity versus tny u 8tkbuy y3d(hkbh+z ;duj6z9d3 mx: )a-z:ime graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The ve)tjzzl:y+ j ozbw1d) +locity versus time grap)jbw d+ytl+:1joz z)zh of this object is

  The slope of a position versus time graja h gq+gu++q/ph gives

  The slope of a velocity :lvg- se +4qh4dimhxbh3ot 5(versus time graph gives

  The area under a curve i q cc i3du2:llxw);7bsn an acceleration versus time graph gives

  The area under a curve in a vus 3xo gz2h0h1elocity versus time graph gives

  If the position versus time gx 7lx)6pz(3z8sngw g araph of an object is a horizontal line, the object i 3gwgznz7x 8pax()l6s s

  If the position versus time graph of an object is a vertical line, the object ix,f x;hu rwjn88 s*.pisu;x8w prf nhis8*.jx,

  If the velocity versus time graph of an object is a 4d7.vl 3e3dh4kvy +oysb n)rxha0c -jhorizontal line, the object h.vyd4ba4cv-xlrj e s k7dh0)33o y+nis

  If the velocity versus time graph of an object is a straight line making anwdk+arfo;elp j7;uhgc+7z 3 ; angle of 30 degrees with the j;wk a dr7+clhe; o37+ug ;zfptime axis, the object is

  An object moves 15.0 m nortc,igf:tj(n5s h and then 11.0 m south. Find both the distance traveled and the magnitude,(5n ct if:jsg of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 ku9hjj3 +rhgam )cfj 67m upstream jjm+u9hh3r)7 fgajc6in a river flowing 6.0 km/h?

  55 mi/h is how many m/gm lje5q.dcev5g am0g477, has? (1 mi = 1609 m)

  What must be your average speed in order to travel 35 ;anqde ej/ :b3hcwbej8e-9;j0 km in 5.15 h?

  A runner ran the marathon (approximatffkd,0rdka /l,b() 4a kg2qtzely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner i 2qf l)d0d,akkz(tkrgfa/b 4 ,n m/s?

  A car travels 90 km/h. How long does it6b+r jd1er;jy+akp bt5):l .e)9nhe5kwzfs r take for it to travel 400 km?

  A ly (light year) is the distance that light travekrdou4+aab* yc 9;l l8ls in one year. The speed of lighud*kba oy4 8 llra;9c+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 rw: gg:+1n r gshqe:1xpoad and you look to the side for 4.0 s, how far do you tra n11g:::qe p+hgwxgrs vel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100-e8 9 4hssc8zfbpvfm0 s, your averagesmh 98v8-fpbz0ef s c4 velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, thvrp; w94ndg95th re41+dgap yhq69 5pv n ne6ken 1.0 km east, then 1.0 km north, then 1.0 km wepagw rdnky5vehg 94np n+phv91r6;9 qt e465dst 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 th 8voehayrk 00i2u 4w)ravels 1.0 km south, then 1.0 km east, then 1.0w8 yh0a rki2u voh4e0) 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 weekecq1 awhsz+gn 17 l21casr*(k wnd from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive hom7h *2raqg sc(nwz kc1sawl+11e 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 km/h.tztyc*bo ftt79orey x h8x)*;+j. )mk What is the average speed of to7to x.h)cf e +t)y* ;z9m*t xkbjtr8yhe motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whagf*nsr+3a pr t pr+7g)t is her average speed for tp7rs n+a pgr)rf+ gt*3he trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nort 9iur(2lb-kir xx4 c(9bmuj+tmip 7k 5h for 750 miles. What is the average spikck (-rml4x b25uti ujbim+p9(r7x9eed for the trip?

  In a 400-m relay race the anchorman (the person who runs the laskumx7 c+ 1ilfa6m;w6je ln3ibu 08+c1;fkd b ct 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 l1b0w 6;3ukf6b+xn8d c1ml fe+jick7 ;amcuithe race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comet82 vl.k0 jtn3aszif3 s to a stop after 11 s. The car's average velocity during deceleration was 78 km/h. What was the t3zatis83.0 lvnjk 2fcar's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rat3h r.pnv va;fhfh*ogsx/h, ,: e of ghv.vp/o,r 3 x nahhs, :fh;f*$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra*+x7q jdv sc 2v:f col5rjm)h/te 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 a:;)ncv (boyp s;2lu mi 0z(zoot $4.0 \; m/s^2$ 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 wo,c +r /o9:x4xl fzehvspweo* 1e,k6n ith a constant acceleration ofen/o : xp 1s oehv9ow,fx64,* ck+zerl $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity 1hpe d4 /+t9w8 eatnpaqm 9hn)h5p)uvof 5.6 m/s experiences a constant acceleration of 98heh1tm auph5d9+ p )t4p/ wanve) nq$3.5 \; m/s^2$. What is the cart's displacement during the first 4.3 s of its motion?

  A bullet moving horizontally to g 8xy0pb *.c-+d doqprthe right (+x direction) with a speed of 459 m/s strikes a sandbag and penetrates a distance of 31.24 cm. What is the average ro8pyqb.dpc g 0+ xd-*acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catdw9qjz5ss,i r 7n9z 3qapult 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 a9si j d7qz5 ,nqswr9z3cceleration is constant, what is the length of the catapult?

  A car starting from rest mola,;8 4o z5tc; pqtgzqves 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 80 m/s in a distance of 200 m. What is its average r: dt7 93 y-mfx(qermuaccelee7mr3xt9mq(d u:-fry ration?

  An object starts from rest and undergoes uniform acceleration. During txcowk4 (kq(ncg : ahrw0b 2lg01*i5g-k4ds iqhe first second it t4s5 0(clki:xbgnkw ogg-d2(hqac1ir40wqk*ravels 9.2 m. How far will it travel during the third second?

  An object is moving in a straight lin dv0*c+q8koo cj f79gcua3 33-bqlo ipe with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Howk*cg p- d3licjqoo3o90+uf v7 8a cqb3 far does it move during this time?

  A car starts from rest and accelerate83gr+mrs -f uas 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 at abou de:80pqnh ( 5rgcb.(nys4gozh*tnr ,m:p:yzt $5.0 \; m/s^2$ 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 at theroy4a4 5u6 zqp intersection starts ahead wio4y45u zarp6 qth 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 is9mrywv6 *8xspeed of 12 m/s on the surface of planet X where the acceleration dumrsw9vyi*x6 8 e to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wit7 y(m p c)hvy 6cq:lhv0i)+steh a speed of 12 m/s on the surface of planet X where the acceleration due to gravity qvp yy:vc m)s6+thi7eh (cl0) is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surface of planet X .b khy x51m *ls(kuqk0where the.1*xb 5( ylukkskm0 qh 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 surface of planet X whe9v ,myze(l:a,eo k8ph re the acceleration due to gravity i zpm(:9,h, eeyv8oa kls $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.13etqdc ,h (dh9/ -kqvc0 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall beforet,hdk(e/-hdq cqc v 93 you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s.mx 9n-)bb4gqex zl9v9 What is its velocity after 3.00 4n-mzv)9 q9l gb xe9xbs?

  A bullet shot straight up returns to its starting point in 17 s. What i1 oq/bi;2+x7cka0*j ycex lfq s the initial speed of theaqe*; cjfo 0i2 1 yxbqk7+/lcx bullet?

  A ball is thrown straight up with a speed of 3qv-vyrb79 h:;8jvd ff/o tzh 76.0 m/s. How long does it take to return-bqjz hftyv/ hv7;:9 rd8f7vo to its starting point?

  A ball is thrown downward from the top of a:pu g/ daqwil.vk55i9yij8 8l building with an initial speed of 6 m/s. Ii8k wi9u5dia:/ g.vp y58lqljt strikes the ground after 2.6 s. How high is the building?

  A ball is thrown strgg3by1v uo28q20xzuz aight up with a speed of 30 m/s. (only fill in numerical value inovyg 31 z28uuxbzq20g 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 straight up into1(0iopje z kv5r8uns4 the air with a speed of 33.0 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 velocity ax* x;0rbbo18nfvmfv 4- mo1t +6mwytst t = 1.0 s?

  In Fig. below, what -pe jdb- ( lt du atm-qx2,fzi;y/2s2sis the velocity at t = 2.5 s?

  In Fig. below, what is sex jzhy:m*,7h y6bauj +:vi4the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at uo/ a :a0m z8aws+vekh3un1t2 t = 5.5 s?

  In Fig. below, what is the average velonng ( m -lo3i05rpgy8le 1 3plm:xvc0ocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6. g 5 +1k sfjgdv),tzwxm99sfn/d5sel.0 s?

  In Fig. below, what is the a wat( zol54q.t49cx 0aqyj8/p 3c wtdhcceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3i9i.8n/ijw ua.0 s?

  In Fig. below, what is the average acceleration fjjjf;s gadvk6/5*xlzj s wi1a6(3x g6rom 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0jnjoteq4 n-aps7 uajp* .d o2* -cgv53 s?

  In Fig. below, what is the dis (mu:vz zw9yt0placement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {5rpg*7 j e8a/wc( zvu2dq-zxa4ykj* ispeed|velocity}

  An object can have a varying speed if its velocity is constar +gi06 9pvc2xp-ku tfed p**pnt.

  The velocity of an object can be negative when its acceleration is cp/f7byo8sr 9 positive.

  If one object has a greater spee5 p-s.yo5bwk dd than a second object, the first must have a greater acceleryb.d p5w o5ks-ation.

  Two cars emerge side by side from a tunnel. Car A is traveling with a s, q 5zxt4htne,peed 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 acceleration decreases.k;powim52a+qhb ds6n5 fi;/mavf* i 3

  A baseball player hits a foul ball straight up into the air. It leaveux yre7g+s nxr (.( sw3(e4 srvx6cp8os the bat with a speed os nx pcres y.+xo38 vrx67( 4wusr((gef $120 \; km/h$. 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, whan0wn+* z 3 ti n3roj 6gbt5a*.n3q aba*nimpf5t is happening to its acceleration, how does it change if air friction is ignore5opbat tninmza36 a nq+30i.f3b *rw5gn**n jd?

  As a freely falling object speeds up, what is hajaqz f)k- v/6p g8ts5appening to its acceleration, how does it change if vapj z6/sg-ka5t )q8fair friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originasq-yc*d- 0wdsl position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how w0d-s-* ysdqc will this result be altered?

  An object can have zero velocity and nonzero a.iig+f t3fhb 5cceleration at the same time.

  An object can have nonzero velocity and zero )a3xo w0wgg9bna5x /uacceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no st:;zjo2gl(t. 35tccw;na9up,e n zrmtops along the way has zero acceleration(tzz,m;r p. nj e5w3t;glo:ca u92ctn all the time.

  A rolling ball moves fro1 +*n1oc- evlmnl0mi ym $x_1=2.3 \mathrm{~cm}$ to $x_2=-5.9 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-5.0 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a xb2e4y-g) so, fuw5xground a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.4 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 111 86a1-nz w lwyollbuwh fbf9ib+0d ,. 6m away in 8.4 s. It then turns abruptly and gallops halfway back in 4.7 slzi-+f68b9 llfhd1wb. 0 w,nyba6u ow. 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 frsrod4;f f;bgrz-in , ogl.r+m5ss :m,om $12 \; m/s$ to $23 \; m/s$ in 5.2 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 frocdz h *eik8y+r *g*9gom $16 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speee zj-db:dd, i6d of $30 \; m/s$ 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 blocks to essentiall3pf0q f5u a mbd:8g4 ire:ri6yy top speed abouayf qfr36b um gi08 :pdi:e5r4t $11.0 \; m/s$ in the first 10.6 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 unifor/ulf g48z+** y yhhp.hn 8yzbumly from a speed of $21 \; m/s$ to rest in 4.26 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 onxu( 9cv+k5qz5+b f3 xk:xmyk 2c;ge rm the highway. Assuming a decele 9c 2zxyucx +k x5g5b+3mm v;e(qkkfr:ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc rx77li6d me* eq)3nrzng1 )zak going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$