Suppose that an object travels from one point in space to anott)zmr ;b o.:qdrn ,1ttlk jcfj*p 8-b4her. Make a comparison between the displaceme.,481)mor q;jtlbzd kt*njpctb r:- f nt and the distance traveled.

  When is the average velocity of an object equal to the instantaneous ve ax.x,8seu yj:locity?

  A new car manufacturer advertises that their car can go "from zero to sixty in wts- eqi40is8 l3)ixm bxb21z8 s". This is a descri2 e80s xqiblz-wts i41i xm)3bption of

  An object moving in the +x axis experiences an acceleration of -6 yn,pzairq*$2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to t2y* vt z4 gev;qmu,gjx9l+pa0 he East (+x direction) begins to slow down as it approaches a traffic light. Make a statementu9gqzl + 4*avtexmjv20 gy,;p concerning its acceleration.

  Suppose that a car travelinyr;ctnwxc3 ebp 3o -/4g to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concer3r- c t3oyep;ncwx/b4 ning its acceleration.

  Suppose that an object is moving with sp v49hlcc(t3a constant velocity. Make a statement concerning lh4c c 9svt(p3its acceleration.

  If the velocity of an object is zero, does it ,qdk-o 1ra 4 2w;a ts5igd1ehvmean that the acceleration is zero? Support your answer with 5w2,as; hv e rqgi4dto1 1kd-aan example.

  Can an object's velocpe *8*w:kaajp ity change direction when its acceleration is constant? Support your answer :jw*8apeap * kwith an example.

  Suppose that an object is moving with constant acc6 k-v (ejiep bp3o 862q:pxfcceleration. Make a statement cepb(fck8j3x-ipq2 6ecv6p:o oncerning its motion with respect to time.

  Can an object have increasing speed izkh66v8jt3c3 ;s jykwhile its acceleration is decreasing? Support your answer with an example.jc833z t6kkhjv sy6;i

  Suppose a can, after an initial kick, move on al2cx sq+*lyds/c86k 3y7xs up along a smooth hill of ice. Make a statexcqlx2ks 3/ 8clao+*7dsy6yn ment concerning its acceleration.

  Under what condition is average velocity 6 s5 b ocu+x5i;m,errqequal to the average of the object's initimi, 6ro+c 55xqer;busal and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. H5vjx /xnd *-, zpl/wayowever, object A accelerates for twice the time as object B. /zx/px n,j d*ywav 5l- What is the final speed of object A compared to that of object B?

  Objects A and B bothih;yo s-csg4; start from 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 of o-hs;cyig 4o s;bject B?

  When an object is released from rest and fal 78p)nx/1ol e6 n /eeqxshy7emls in the absence of friction, which of the following is true concerning ihops7yenqxml6/ne8 ) /e 17exts motion?

  When an object is released from rest and falls in the absence of frili-ytu f;teh n4 15ex/ohd99:e8 wixp ction, which of the followi8;wfy4h9 dip 5lo:x1n t x/9uetehie-ng is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velwrggwdq17e) nf r(xko4+;j r 7ocity and the acceleration when the ball reach71r 7kd)xr4rof+wj(g g; qwn ees the highest point.

  Suppose a ball is thrown straight up. What is its in(t a-omqg)/u:7nde acceleration just before it reaches its higntg (me:7i-/u)oaqn d hest point?

  Suppose a ball is thrown straight up, reaches axr 0i-smicvji7e2+c ) maximum height, then falls to its initial height. Make a statement about the dire2e7 m ixisvj-0+cic )rction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls)gafbb9 x0idzu9h2bs:) +e7d7, z c :j zkwwlq to its initial heib bx k :+h,aj)gzds :907z2fbz c q)dl97wiuweght. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown do2i* cain-ov(m6js eix ((pn; lwnward in the absence of air resistance. Make a statement concerning itsiv2ei ;j *sn(6pn o c-i(alm(x acceleration.

  Suppose a skydiver jumps from a high-flying 3+udel 8h c, l (.cr+ zhgtio)7(lvobbplane. What is her acceleration when shbhilc +t. olel dh8g(cuzb,+(7vo) r3e she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bap3kn/haxyr(x 5 24okl ll is thrown upward with a speed 2v (twice as fast). 52pkk 3/nrh (a4 xoxly What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top ofkwmyob(ad8u 9+(bk/s *ib3oq a building. One second later, ball B is dropped from the samqo(k( w/ys*9mai3bdo k8 bub+e building. As time progresses, the distance between them

  Ball A is dropped from the top of a bui u6zqrrp*3f2tyw76sketbxwb /2;tr 3 lding. One second later, ball B is dropped from the same building. As time progressek6/ tyuxprrb;3w 7beq 2 fwr2s63tt* zs, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, jbm,-ri *gaido8b6s 6and the other is thrown down, both with the same initial speed. What are their*6b b- ,mr68idjiasgo speeds when they hit the street?

  A brick is dropped from the top of a building. A second bric+ k lqh,b2v+lg)bi ef;x0(q oxk is thrown straight i(bv+f; q kho0lb ex2qx+,lg) down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant now5/(flcnuwd*d)x k0mu pqf, -n-zero velocity in the +x axis. The position versus time grfw5uq0,( /ddl-f )u w*kcmx npaph of this object is

  An object is moving with constant non-zero acceleration in the +x axi.o-czceq td 7btm48p5 s. The position versus time graph of 5do.tpet8b m 4cq-zc7this object is

  An object is moving with constant nomw* (d 6c(fh6dwg pejiou1 dih:/gg75n-zero velocity in the +x axis. The velocity versus time grap6cihg/ u (61gwdfg 5 md:7o(*jihpewdh of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The v7semnyo;3* h ;qtav4pelocity verpnmv47st y;a *3e; ohqsus time graph of this object is

  The slope of a position versus time grauur7v (k 3 2:kpmw)bqpph gives

  The slope of a velocity versus time graph give/oo q6l ljlu c(5:1tjos

  The area under a curve in an accelerationj +7m f)qic uj:e 91 fpc7s9iszxbd:k) versus time graph gives

  The area under a curve in a velochpfmwg4h a 4o:re z7ddm01(4kity versus time graph gives

  If the position versus time graph of an object is 8t qcb.0;ig uef0 +gwsa horizontal line, the object ; u gsq80 wtgie+0bcf.is

  If the position versus time graph of ag 5p /j4ejvw5wn object is a vertical line, the object is/ pwvj55j4eg w

  If the velocity versus time graph of an object is a horizontal l ,mvlbk3, *vt8 wax;fuine, the object tm,alwvv, 3*bxuk;f 8is

  If the velocity versus time graph of an object is a straight fx4bc5a*(uxn p9s5c b line making an angle of 30 degrees with the time axis, the object if9*c cax nxu(p5bb45 ss

  An object moves 15.0 m north and then 11.0qrvuste /b/192e+ a br m south. Find both the distance traveled and the mb/+vabu1s eq 92 rer/tagnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wjabm c3wrn0 iwjuwt q,, kv :03ny:b4ea;d)/till it take to move 12 km upstream iu)ei tnvr03wjjw,a,k by/cwd ;:b0 :t3 na mq4n a river flowing 6.0 km/h?

  55 mi/h is how many m b:9 e,)l vq2sxh 5fbcbvka+*o/s? (1 mi = 1609 m)

  What must be your average speed in order to traveu kb 3x;vzb5f9l 350 km in 5.15 h?

  A runner ran the marat9gr,g.u gmkl vkm84 :zhon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of thuggz . kg8,9rkvmml4:e runner in m/s?

  A car travels 90 km/h. How lhqz8k1 z5ax ly*6-zmaf5mw ,tong does it take for it to travel 400 km?

  A ly (light year) is the distancml3jb7-7(+w9dbrv hucb psu :e that light travels in one year. The speed of li3jb p-s9um: w7b r7lvu(cdb+hght 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 forn;vq0w15vy,e uy 8side for 4.0 s, how far wv, n15yo8q ;vur0eyf do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your av. j z, mxvii7, hqv.8l+gohu5serage o5+,sv,g.qz v h mix7u8hilj.velocity is

  A polar bear starts at the Ncadl 4j2+zy5k, 7 /ma(ff5cl:vf us ztorth 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 starting point. This trip takes 45 min. What was the bear's average speed ,25vf yakufdc+z:l / zlf7c( js54atm?

  A polar bear starts at the Nort/3cf6jw: tlul h 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 starting point. This trip 6wluct:j 3/fltakes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from s otyxhit, s 929*rdt1dchool at 55 mi/h for 110 miles. It then starts to srstx29,h* 1o dtdit9ynow 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 16k)m1h n2h+ c5* mwc.whas oq,a0 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for thi +nh*c,.s a)cam 2hkqwohwm51s trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her2t:i m,u9b1g wekp61 m9z adkvi,x5sm average speed for thebtkp m56a9g1 zikvs9mim, x ,euwd1:2 trip?

  An airplane travels at 300 mi/h south for 2.00 h and then attfx h.fz4m9hgjv4 /r+ 250 mi/h north for 750 miles. What is the averf.4+htg/mrf9v4z xjh age speed for the trip?

  In a 400-m relay race the anchorman (t0aoq 1jj24(h/e7 grdrnlj hfs62;nynhe person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival,h 2 g jn1 2rhdq7j0naoj(e y;lfnsr64/ 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 uniformlyzl zfbrlf6-k4u m5im9 10c2:buk)dxm and comes to a stop after 13 s. The car's average velocity during deceleration was 37 km/h. What was the car's decelerat f145uk2mzc ur-:lzxkibf09)d m6bml ion while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s91 a60.rpl 31u j;nulvhtf oi1nu*yix, at the average rate of jvo;tf1h3n lu*p9l 6ayu.n 0r1iiu1 x$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h abw nqizc *5u* m(1k;mwccelerates at the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accele pc5*n 708*qgaj mtvkp)1b w ntm:d m7obfbe)+rates 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 thenvc 7*gka k-y/,abdv8 b speeds up with a constant acceleration of v bvc *ba8/-7ykadgk ,$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.9 m/s experiences a constant accelev:cc jw: 2z)eaqmm58f r0ok1eration ofe:qrj1z5f m0cka:8 emv) c2o w $1.6 \; m/s^2$. What is the cart's displacement during the first 4.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) ;; (t 8p/tqooyeocg-pwith a speed of 540 m/s strikes a sandbag and penetrates a distance of 92.16 cm. What/oeoo ;8py c gtp;(-qt is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fg. nqt7v4hnq( ) rflj9ym1s;arom 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 thqtlmrgva9( sqjy f.n4 ;1 )hn7e acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with42yx; d nqcy)g tg3nk, 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 iqi+s byx4+h: 30z ukrfs its average acceleration?+3sfyr:zb0hu+x iq k 4

  An object starts from rest and undergfna9 7wu+y+rc4e c7f)b7bgk aoes uniform acceleration. During the first second it travels 4.2 m. How far will it travel during the third ekr cubgcb7+4fy f7na9 w +a)7second?

  An object is moving in a s,6(nqe oqp0ek traight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How ,(6kp qnqoee 0far does it move during this time?

  A car starts from rest and,e)o tf9f-sj i accelerates 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 drf*9tv(qbk h.w kli*v xn9t +*ry 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 tk2: q 2qln1js; idss1khat has been waiting at the intersection stnq s; s1kql1sj2 d2k:iarts 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 su0,4rpma leqjrszh.8y y . 5e*j;wh-mmrface of planet X where the acceleration dhw.s 8lzj *hy mmrj,r m a;0q-y5e4e.pue 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 m/s on thh48jp4z;pov rt)pb/ whfh( 1azf-tu 6e surface of planet X where the acceleratppv41jh h 4zu8of(t;wabfr-t 6/ph)zion due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surface of planet X d or9q1 n-v6y:j ze:vpwheo-z v::pvqjdry9 e 1n6re 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 surface o.t(: 4 sgx 4ccd:bljtpf planet X where the acd4jbtl x:c4 (pg:s.ctceleration 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 gds s8yz j;p1./+ hjuyfreater 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 be.jy/dh1+pjys ;z8fusfore you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velot :qev:8 3eu mx4bdjkjgto)409-fp aucity after 3.0v :4eb)q o4apxm8t3kd 0f:jujt eg-u9 0 s?

  A bullet shot straight up returns to its starting sn/es9d:ys b5point in 16 s. What is the initia bns /ey5s:sd9l speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long r ,ae oy:7slognz43+yv9(yqqdoes it take to revq z+(yol9sr o7y4ga, qy3en:turn to its starting point?

  A ball is thrown downward fromq2no:oo5* on ol 14bbb the top of a building with an initial speed of 7 m/s. It strikes the ground after 3.4 sbo :lbon oq15oon*4b2. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical val+*;gu t /l)shi.trj jiue in the ui )l*r;t+i t js/j.hgblanks)
(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 )+u4h+ pemer dair with a speed of 43.0 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocityf-x re1iy;l a5 at t = 1.0 s?

  In Fig. below, what is the v b9zxq/rzg--rts e6: velocity at t = 2.5 s?

  In Fig. below, what is the velocity ascchmi3ul z;j q*,1w: t t = 4.0 s?

  In Fig. below, what is 8zfdskzav:zy8o;5 o7 ce oj6; the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to j8sq jcu(3owc2cxng5-k) 8v f 4.0 s?

  In Fig. below, what is the average velo+ qaw7u96-klmp x h2k+q4, xvgljb.yqcity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0na f6cwqv)8mg3cc2 k/ 68o iok s?

  In Fig. below, what is the acceleration k3a9tse 7u(or at 3.0 s?

  In Fig. below, what is the average acceleration f vpi1emy c,d2.rom 0 to 5.0 s?

  In Fig. below, what is the average accele 6,/zv 3;jvwoigc)oxw ration from 0 to 8.0 s?

  In Fig. below, what is the displgbn;ps9eq6) cc3, 9mzy4www racement from 0 to 8.0 s?

Does a car speedometer mea g/ouyj)lyz77f+c.(q6k qjoi0 u+s cfsure speed, velocity? {speed|velocity}

  An object can have a vx/ ozv/r odbl*82qw .varying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration imfnaug8 8gsr /eg.4( * qvaxp.s positive.

  If one object has a greater speed than a second object, the firs urt t8efay4((y u0c4tt must have a greater acu(cte4t 0(84uytray f celeration.

  Two cars emerge side by side from a tunnel. Car A is traveling with2e 9n6.gmerciohb 8c+ 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 incpht-;q mjwx4g)1 *halreasing in speed as its acceleration decreases.

  A baseball player hits a fou) v2-7cx;1e lxyo9ajuzjsb63ix3midd o .5inl ball straight up into the air. It leaves the bat with a speed o ox1s.36i)cbu vz del7;2aj mxix59i dn-joy3 f $120 \; km/h$. 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, 3gax3ou :*qwwwhat is happening to its acceleration, how does it change if air frgwo3*u3xq wa: iction is ignored?

  As a freely falling obje/w sk4cl+ vws7ct speeds up, what is happening to its acceleration, how w7kv cs+sl4 /wdoes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will retur5i*ujunie1-o n to its original position with the same speed as it had initially if air resistance is negligible. I *n1juiuio5e- f air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleratixvd9qw:ji)qs 8 4hdy3on at the same time.

  An object can have nonzero velock9l8.)x3z ;qqw lcams ity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor makixwu;94p(iy tk ng no stops along the way has zero aipt4uw y; (9xkcceleration all the time.

  A rolling ball moves frk/ zv+59tkhl 5m l3kigom $x_1=2.4 \mathrm{~cm}$ to $x_2=-4.2 \mathrm{~cm}$ during the time from $t_1=2.4 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.2 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milei4fhy 5v5;/dyusa.1csb xu x 6 ($1 \; mile = 1609 \; m$) track in a total time of 10.5 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away zvi mo*kjv xsp2*9v9eq :4cu,from its trainer in a straight line, moving 100 m away in 9.2 s. It then turns abruptly and gallops halfway back in 4.7 s. Cai 2qj,*4xezs 9 :vvmu*pv9okclculate (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 fro0rg1n 3inty2imy50ne d7nvobj0l3 )sm $12 \; m/s$ to $23 \; m/s$ in 5.1 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 oo.i oc48ii192srj br$16 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rezhhzu4t .a-1h e) 7ztlach a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essent3 qj0wi 70z(dia4i.j qyt2xkfially top speed abouj3tj7ki ya 0xd zwqiq.4(20ift $10.4 \; m/s$ in the first 12.8 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 of /lc( leqqgdw. 7iv0i6$17 \; m/s$ to rest in 4.58 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 h0 ;+fnv*lz7c; vte 7-dnzflas f, m8tgighway. Assuming a deceleration8 t70zenn sl m,-lfda;c fz+;vf g7*tv of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck okuv5kv;/ tx)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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. After eazep21ww 2izo 1neg /:xactly 27.0 min, there are still 1100 m to go. The runner must then a2z2 iaow: z/pewg1n1eccelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$