Suppose that an object tu0sx tgi4 pw84ravels from one point in space to another. Make a comparison between the displacement and the distance trave 0t8w4x 4pigusled.

  When is the average velocity of an object equal to the instantaneous velocita+xkusqrwf9,x6w5 z3tf .fj9 y?

  A new car manufacturer advertises that their qs;+dpjw6cb* car can go "from zero to sixty in 8 s". This is a ds6w+dcp * j;bqescription of

  An object moving in then1p9 s7;g 8ug:wmz3yy .epkog +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x dirg g+iw 0; y:wkc/xjnirn)b8g1ection) begins to slow down as it approaches a trn wgrnic;:jb yg/x) w g+ki108affic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dozpjso w 2*/ l(c/hzak:u,8 rksx+ ,plywn as it approaches a traffic liaw /+ kz( ,8l,k2*lj xhspuz y:prsco/ght. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement lg d-fgzd.k7 udp4a/(concep (ag./u 4dz-dl d7gfkrning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleratin(7)t8lwkvo,yvxad sp * at (9on is zero? Supk(na79vdxwl ap t, yo(8 *v)stport your answer with an example.

  Can an object's velocity change direct+6mxcpgye6(,qe8y; jc 2ol fhion when its acceleration is constant? Support your answer ye2 c+omjqfl(xgce;h,68 yp6with an example.

  Suppose that an object is movine5jhj(mb r z+:g with constant acceleration. Make a statement concerni5ehjr jmz:+ (bng its motion with respect to time.

  Can an object have increasing speed while its acceleration is d m trzvykd2928ecreasing? Support your answer witd 9t k28vy2zrmh an example.

  Suppose a can, after an initial kick, moves up alonvewuin- l8xp1v 3kn )l .k3h:gg a smooth hill of ice. Make a statement cpxlv 3v8gik3-)khul :.nne w1oncerning its acceleration.

  Under what condition is aver pq njc1w 8+nm.wfp;we2+m n;zage velocity equal to the average of the object's initial and fina;n;pcfn++ znw.mwjeq281w m pl velocity?

  Objects A and B both start at rest. They both apt2hb0f*xf -5n5x6 uk8jzstn ccelerate at the same rate. However, object A accelerates for twice the time as object B. What is th*k55x-bxt z sfjut028nfp6nhe final speed of object A compared to that of object B?

  Objects A and B both start fri l3 (dft 1f4whb+)tkpg pz-j.om rest. They both accelerate at the same rate. However, object A accelerates for twice the time as objecpktgj h+) f1-w.4tblfzidp (3t B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of frictp h)e+dzm+y)nwg/nn jjxt jj ;4v6 v1b((/fs zion, which of thev+ h) 6mpe z(nvdj;jx nws1njg/y+4( zjb/)tf following is true concerning its motion?

  When an object is released from rest txu. x/oha *xvw a)+fx5q 2kw;and falls in the absence of friction, which ox axk 5w/) o.wtuhxxv2a*f;q+ f the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a su0xsk8a b;y;*g ddt,p)iv jy4g1 uu2q tatement about the velocity and the acceleration when thyvpu )2ax0 buygq* k; u1tdds j,g;4i8e ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelerazjgtu09a:i bjj (*ga- tion just before it reacheaj:u*g9tjg0 - b (ijzas its highest point?

  Suppose a ball is thrown straigh/;n)g5.s2 n -z py9vkwwyhojht up, reaches a maximum height, then falls to its initial nh/9kwos.y-y ;j2)5n hw zg vpheight. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straig7.qyat)q 7juoht up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleratiotqy7 u)j.a qo7n as the ball is coming down.

  Suppose a ball is thrown downward in the absence i n*erzj;70axqi22h( y7pvd ( zce7so of air resistance. Make a statement concernizqvj7c zr7 ;e7hipxod ai*2sye(0( 2nng its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is z(3ovqpo4;gy s (ov;vher acceleration when she shevpo3;v4 (yqoz ogvs;( reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secondoyjmw, 5(g:od0 4whxz ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of tg:4 m5zowhy 0,dj(w xohe 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 the top of a building. Onr 0ddvicki780+x oe w 1*;nyuor;mg 2fe second later, ball B is dropped from the same building. As time progresses, v7i;*rnexo 2;o8 du+wir01gd kycmf0the distance between them

  Ball A is dropped from3l.jd k7lrpw . the top of a building. One second later, ball B is dropped from thpkr. 7.llj3w de 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, an m(w6qif6hzs 7d the other is thrown down, both wiz sm6hq i67f(wth the same initial speed. What are their speeds when they hit the street?

  A brick is dropped frot ljlbm l7183 ;k3saot4f thi-m the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect airi k8tl-t f t7m4aso3;j13bhl l resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x a aje*l4tcyx2w;g6rppg:/ ,di xis. The position versus time graph of this object6g p c/aj: x,d;i4rwt2*gylpe is

  An object is moving with./(fj g vop77kbhkma5 constant non-zero acceleration in the +x axis. The position versus time graph of this object vp7mg.ak5 hjofb(7 k/ is

  An object is moving with constant non-zero velocitw3s-b(4 wc q0;fprx uey in the +x axis. The velocity versus time graph -c 3pu4rsebw0f xw; q(of this object is

  An object is moving with constant non-zero acceleration in the9wep:5sox,el.g. c,c tfizzy(2 i9g i +x axis. The velocity ve9zzt fsi.5(xic9,2p,igyg w:c .loeersus time graph of this object is

  The slope of a position versus time graph gives2lxvyy o;0v*s

  The slope of a velocity versujdx:rq 3 s z42ix);h sk3nzge;s time graph gives

  The area under a curvewd.azq -1vqv.ao* lwg+l7i (m in an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph 7gcdf9 ug 47fngives

  If the position versus time graph of an object is a horizobyml m:k+85dpio )mxt eyyds308**lantal line, the object idd mxsm8myo* bta0ely* 83+p)5l: kiys

  If the position versus time graph of an object is a vertical line, the -ool 5poaw*,y9thc e8/jre f :0 utf2aobject isfr o/ e:t2 euaj-o8 l5* hc,f9woapty0

  If the velocity versus time graph of an object is a horizontr 9+vxr )p7wstal line, the object irvx97 ps wtr+)s

  If the velocity versus time graph of an oan/voi*(k+uz6yl t*9g w7l ojbject is a straight line making an angle o v7g k+ulz lno9ito/j(y6*wa*f 30 degrees with the time axis, the object is

  An object moves 15.0 mvfy oizixl-+ y/uy9/( north and then 11.0 m south. Find both the distance traveled and the magnitude(xifiy+ /oy u/- 9lvzy of the displacement vector.

  A boat can move at 30 km/h in still water. How j9 samk1ftk364xhoj ljx5ee..:6j di long will it take to move 12 km upstream in a rj4l e i6 k96mj1.ka3.5tjs fj:hdoexx iver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 18jj u*t q+f2fv609 m)

  What must be your average speed in order to travel 3a- j1vow8yduihi1.l0 p c2z3e 50 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What fpm,whuh5q:9.4 (vn* era of cis the average speed of the runnerph(ufo hne*cmr:f.a, 9qv 54w in m/s?

  A car travels 90 km/h. How long does it ta0l/ zqfxck 0 (kh8tgbq2 4 9jf.czcxk6ke for it to travel 400 km?

  A ly (light year) is the distance u*bw);7q jk c1vbuf3o that light travels in one year. The speed of l*kj)wu o 31b;cqvfu 7bight is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you look to the side fn,/m,y(kr 0tzg n1uv mor 4.0 s, how far do you travel during this inatteg,n/nt( 1um,zkvm 0ryntive period?

  If you run a complete loop around an outdoor track (400 m), ixmxr40a 8lsg +n 100 s, your average velocity ix8r0g amx+ ls4s

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.l ;guo6jxt;3:e 8tdulssk, 6u0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's 36 stx8 l6uusgkut, oe;jld:; average speed?

  A polar bear starts at th)9n4wxy5rmi4oury.r la; j s5e North Pole. 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 startir .95 mwa;4o4lru ri)jys5nyxng point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school atch7v5x3a*2gljx jt7 d 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 l tj73 7c*xdxvhgj5a2 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h andl:4ag) ugs*bnjfvciw5j6n uvehez8g*/ 1 d* / 160 km at 100 km/h. What is the average spenn14**)ahzf/wd:vgje g*uc j8l i/u5 v6gbseed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0nd8;ja.7olfg - x3xo8xuc (di h at 100 km/h. What is her average speed fo3 a(u7dx x 8.-dl;cnoxi ofg8jr the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at wp. qa x/*/s l vlvuekq;0w-4b250 mi/h north for 750 miles. What is the average speed for the t;wpl/sue w /qq a *x-l0bvkv.4rip?

  In a 400-m relay race the anchorman (the person who runs the las)zv5jcn xt4-: nwuu; wt 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for ten)u v5:n4j-t wwcuzx;am 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 aftel 4pfzbj6)y /njll2 ,dr 8 s. The car's average velocity during deceleration was 51 km/h. What was the car's deceleration while sl/jblylj4 zfl d6,pn2)owing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate uw (+of 4onagiez7g8 f aq/:;kof f8wgaki/fo +7(ouq 4en g:za;$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the reo mr( h1ks)w6ate 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 7ehrkohw 7s.x8r 78jnwi . irdl :s flk(v.n)2and 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.3fm- kq4dzm 8z It then speeds up with a constant accelerationz83q4 kdfm-zm 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 4.3 m/s experiences a constant aq* z)kvocpq,ofq((,* hw t xf,cceleration ofohzf,qpt, qqx c)wv k( *o(*,f $1.9 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a sp)*w je kidr n cd5-tbm20u8.bpeed of 222 m/s strikk.ru)b dwp n25it *e80-d mbcjes a sandbag and penetrates a distance of 11.91 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is la3ain* 2 py/bjbunched from 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 leny2bp*3n i/ bajgth of the catapult?

  A car starting from rest moves with consccc;n 2b8bev 8f 2r ow+wytq)4tant 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. Whatow,4l 0v ;xmrq0jymc am9i9e- is its average acce mm yv0m9oxw ac0lij4 ;q,-r9eleration?

  An object starts from rest and undergoejl85h mtaz 07is uniform acceleration. During the first second it travels 4.68it lz7a5 0jhm m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initially itjs8 m2,mg-wkd5bwqx9 is traveling at 16 m/s. Three seconds later 8 d mwwsxg -jk2,q9mb5it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accjg9dm;sz bef :q5 )qh+elerates 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 decelems,1)ht,fsk krate 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 wait :fc0uu cs/ehbevp9vh* 74 + an5slpn re-6/zaing at the intersection starts ahead with a constant accv cule- 640uhn+p7/epnr/sf *aesv :ahc5z b9eleration 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 o v9,fx; cwss0oxx9vq/ n the surface of planet X where the acc90 ,s9qox f v;/xswcvxeleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 4bi6 q;a zhky-m/s on the surface of planet X where the acceleratioy 4 hab;iqk6z-n 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 the8)r6rv eaecrmf k 3,s9 surface of planet X where the acceleration due to gravis 8ra er6ke9), cvfmr3ty 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 om pzt wyk6m 5;7,evpp;f planet X where the acceleration due to gravpe57 vpp 6ktwyzm,;;m ity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually gr fuoq+ 9pr)b sq::w s*:xhhvm)eater 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 befwhxb:vs q+:s*ur o hfpq))9:m ore you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is i:c6nm;du4r2 5cp- +xbzo vyiyts velocity after 3.0pyi+vzxdcmn: r-b 24y;oc6 u50 s?

  A bullet shot straight up ret y)w1op 90jj0xty;io h-y- vtvurns to its starting point in 13 s. What is the initial speed y-)t9w10y ijo ot; -vhjpxv0yof the bullet?

  A ball is thrown straie5v.jew np6ipzkf438ok/ r +rght up with a speed of 36.0 m/s. How long does it take to return to/ekve kj 4n+rzrw 85f3i6.pop its starting point?

  A ball is thrown downward from tu)yfiyg) w8 tv *jh6v(en/l -uqg:)sn he top of a building with an initial speed of 29 m/s. It strikes the ground after 5.3 s. How highqwguvl)-: sfu6/g)8)ij *n ny t(vyhe is the building?

  A ball is thrown straight up with a speed of 3zerc20;f5/yg rc; 4s gccrrt -0 m/s. (only fill in numerical value in the blank05g2;crr cgcr -f;rs4y /etzcs)
(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 p)ckp n i nf*j*;gs*9jinto the air with a speed of 49.4 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vexd8ic.uux hw7vgk2 3a /9uzh0locity at t = 1.0 s?

  In Fig. below, what is the velogtz y9r;(0hmy 9g 9cdzz.wth-city at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 thr.bw;3 8i wos?

  In Fig. below, what is the velocity at t =pm0(vvrta 3(6guyh y(rdw 9u/ 5.5 s?

  In Fig. below, what is the averagqcw ffb t vo- (y4f:koy2g9/,ge velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity frn9ku -,+ggfr6 1wyox dom 0 to 6.0 s?

  In Fig. below, what is the acceleratio s3oz; mudxl32n at 1.0 s?

  In Fig. below, what is the acceleration at w 0og c4ow*t-c3.0 s?

  In Fig. below, what is the aver y0 1+qecyxqrj.y5y n4age acceleration from 0 to 5.0 s?

  In Fig. below, what iyd2 (1)sfriylff2s7 x s the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the1yn ge:)1nqte displacement from 0 to 8.0 s?

Does a car speedometer measure qi0kso - 5 nnncgwa7*+uk:,uaspeed, velocity? {speed|velocity}

  An object can have a varying sb ye;kuf d91c2peed if its velocity is constant.

  The velocity of an object can be negative when its acceleration is posp3qcn51d 5gw d5/kqqjitive.

  If one object has a greater speed than a3q *uj6dtw,i w second object, the first must have a greater accelerad 6iwj qw3,t*ution.

  Two cars emerge side by side from a tunnel. Car A is xdla,qpdtp+5snk *e*51b /ex lk : ,putraveling 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 acceleration decreases.by: t7qzkw vydx;1p41

  A baseball player hits a foul ball straight up into uzqq:b jm +/b*the air. It leaves the bat with a speedz+bm:qujq /b * 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 accelerae 6 tk/ozj/,/9tjr cpbtion, how does it c 6o pt//9/k ,jtzebcjrhange if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerat4bbphl yt7tkiin n+.h 4q:0,qion, how does it change if air friction CAN NOT be ik,phnb04 biq ni4yt q.+htl:7 gnored?

  An object that is thrown vertpn++r,a9j yvk ,x.c,-nb)1 sdlxrgt7 k fwbl.ically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this res+d rsbbllwx+cy j . 1 -,vgxtn.kpak),7n9fr,ult be altered?

  An object can have zero velocity and nonzero acceleratiox:h zpao .z. stpq.db8+fk)g*n at the same time.

  An object can have nonzero velocity ol52krvv(x iyb+w*: ng ; h0xdand zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor makili21sll -y 4xzng no stops along the way has zerol2l-4xzs1 yli acceleration all the time.

  A rolling ball moves.1hxoy4 im)ql x, i/gp from $x_1=2.7 \mathrm{~cm}$ to $x_2=-7.0 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. 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 $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight compv:ps8 cxn yxjo(hp9jm): f2 tv gl-2.mlete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fromsm:jp2wx+u5)tpb(b i its trainer in a straight line, moving 100 m away in 10.7 s. It then turns abruptly and gallops halfway back mj(xbs:+ wubi2t5 p) pin 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 frk+2cbgq p n(pndg8948 umpci 9om $11 \; m/s$ to $24 \; m/s$ in 4.3 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 frovh j4ih:jhaj . wl bztcc7p/ka+5.u ;/vp)8 qum $19 \; m/s$ to rest in a distance of 56 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of)k 2x5dx j)e r8cml,bc $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of tp urm8cja 0(rd,9bz- mhe blocks to essentially top speed about cjpu-dzr0abm( r,9 8m$10.0 \; m/s$ in the first 10.3 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 speedpwvm+n p i -i-//kp)gp of $17 \; m/s$ to rest in 5.45 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 one6dz* jhvdd 749d r n+851uxw /jncqqf the highway. Assuming a deceleratq* jzcdqn8wf4/h56drud 1dn j7xve 9+ion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going so3 . mdoy3gai,v *lx2eutc7($25 \; m/s$ 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 mi 7nuh d*(4a.64nfbt/ulv3 v 9 dchtxxgn. After exactly 27.0 min, there are still 1100 t6u 37 dnx uf/ (dgn*t4hhvlx.vc ab94m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$