Suppose that an object travels from one point in space to anothka:zn7,d;n( sse jpl. er. Make a comparison between the displacement and the nas;7:l.zj espnk(, ddistance traveled.

  When is the average velocity of an object equal to the instanta.:4xtbcn,)j- jx3 2)sm42 vfv laaryinv8h g rneous velocity?

  A new car manufacturermr5m ccbf6: :j advertises that their car can go "from zero to sixty in 8 s". This is a description oc r:m5bjmf6c:f

  An object moving in the n+u, oneaurj;)m t4:u +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 dire. v-vj-9pwl lfy o,n:zction) begins to slow down as it approaches a traffic light. Make a statement concerning itszlf- ,ly. pvv9:-onjw acceleration.

  Suppose that a car traveling to the West (-x direction) 3 h l9p2hqy**dqsx-7ku mz ad-begins to slow down as it approaches a traffic light. Make a statement concerning its aczyq- q-h*2u3 p9hxk 7as*ddlmceleration.

  Suppose that an object is moving with a constant velocity. Make (mnn4l rsotg1 d:l0ak,/9 0x(f bosfaa statement con(s/ fksfnla a00,x:(logt drm19 nbo4 cerning its acceleration.

  If the velocity of an object is zero, does it mean that :o0 s lry0gfy.the acceleration is zero? Support your answe:l gf0oy0s yr.r with an example.

  Can an object's velocity change direction when its acceleratiqub. w t,e-yn68-3jbclagli8on is constant? Suppa3 l ,t8yw e8gblq-n6jiuc. b-ort your answer with an example.

  Suppose that an object is moving with constant acceleratione8)c dcy 5zy(q. Make a statement concerning its moq c8e(y d)cz5ytion with respect to time.

  Can an object have increasin1 t-z91t6rhv2h kms2 l 9ubhyng speed while its acceleration is decreasing? Support your answer wstb z2h ym k1t- 69uvh1nl92rhith an example.

  Suppose a can, after an initial xk+hm 3:ql.ze kick, moves up along a smooth hill of ice. Make a statement concernimk l +qhz:x3e.ng its acceleration.

  Under what condition is average velouuq,, 4z:zpo pcity equal to the average of the object's initial and final u, pu,z pz:oq4velocity?

  Objects A and B both start at rest. They bodrtktu 61jlbchtqp i:12qrxx1fk. )7b ;d)b 7th accelerate at the same rate. However, object A accelerates for twice the time as objthqq)btfbc : i1lux)k x1r1rdd p7.7;6tk2 bject B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. cw7 hy(crzo+. *g.aco p q5wg-However, object A accelerates for twice the time as object B. What is the distance o.y5w*go.+aqw(h c7c- grz pctraveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of frictimx8 /y;j a8ktzon, which of tm/jk8tx8 za y;he following is true concerning its motion?

  When an object is released :yo5kzhoac r-g0se5r g;9e vg d4 3m/cfrom rest and falls in the absence of friction, which of the following v5ch k 45o0eg:seay ;mcggr/o 9d -3zris true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity 7w-tn1 ;hi :x. v+fmshja fe,fpvvu 9/and the acceleration when the ball reaches the highestu: f anf x+hj-ms9vf ve p/i7h;w,.v1t point.

  Suppose a ball is thrown straight up. Whn 8vt,y c7dw; z6wog-pat is its acceleration just before it reaches its wc7g-pvyotz 8w ,6d;nhighest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallzm .eee ifzd(a547z0rs to its initial height. Make a staiez5zr e7feaz (40. mdtement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches :bwd o(tf0q;u logl0l1k v ,:vcf0b6d a maximum height, then falls to its initial height. Make a statement about the direction t 1u0f6b:0gldlf0:b ,o( vvdqcolw;k of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a syrnhwr0 3 2kb(tatement concerning its acceler n0wb3rr(h y2kation.

  Suppose a skydiver jumps from a high-flying plane. What is g-izddgzwj vmp d/7 r rgw,x86b4m1(6her acceleration when she she rea8gw47 x- wmp (/dig,dvzj 6mg6drbzr1 ches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bal.(gro; 8e pi ch;*t:o8,p xbsm,zjyw nl is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height om;,. i*g,t(c yz;r8p jn8ws:oxb pohe f 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 of a building. One second later,z:+rq k3xd9ec ball B is droppdqr 3x+kz9ce: ed from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B ;-h:ilwgquvioz 6 /*r is dropped from the same buildinguw:h*;qv-l/6z rgi o i. As time progresses, the difference in their speeds

  Two objects are thrown from the ts 6d*awzw h3ey-0jm; iop of a tall building. One is thrown up, and the other is thrown down, both withdja*iesm y 0-w6 3zhw; 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 thrown straigwb:o w/- ptmv:0e)s jfht down from the same bjvo wpb-/:m0f )s e:wtuilding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positcb r20( ej6xw/tuy 2xkapyq4 6ion versus time graph of this op2xbwury( /0c2k66j4 yq etaxbject is

  An object is moving with constant non-zero acceleration in the +x axis r;y;0x;d hf9ysp6xs n. The position versn0r s;x;y ;9xf6 dsyhpus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The veloc45 ek:ey . zqekpae*d9ity versus time graph of this o 5eze ekkay4.*:pqed9 bject is

  An object is moving with constant non-zerod7fi3t0yvkfpftwqw /i;e 9 0+2 lj( ub acceleration in the +x axis. The velocity versus time grapqjl(vi+9et ;yd/w 20ftb i7p 0wf3ukfh of this object is

  The slope of a position versus k4s*et6robgrxpwkco+hm6 32 u7p0*s time graph gives

  The slope of a velocitsyb3rqqcg-v/0100j/gd m o ony versus time graph gives

  The area under a curve in an acceleration versus time 5 ij.f(bb0u s*nca sg/yv0h1ugraph gives

  The area under a curve in a velocity versus tre a47byy nw7;6d q oikkn6j-:ime graph gives

  If the position versus time graph of an object is a horizontal line, the object-d m kf6jsx;t)a6lpw / iswtm-l ); f/jkd6xp sa6

  If the position versus time graph of any80 lsbb;f5re a:d ko2h1p a/n ptj.t3 object is a vertical line, the object is8rj splf ;bh.a at e2y /pdtn3o50b:1k

  If the velocity versus time graph of an object is a horiz f(c0w m(nb5ueontal line, the object iu5 (mcnwf0 e(bs

  If the velocity versus time graph of an object i+aevz 9g/a+yx-z m*qsgo sv5 *s a straight line making an angle of 30 dez*oss x *+a95aq - v/ygvz+gmegrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m so,7g, kao / 7btj8u kii6olzb*yuth. Find both the distance traveled anuolbt7k y, *kj/ 6,8ii zba7ogd the magnitude of the displacement vector.

  A boat can move at 30 km/h in still waterq.l/ 2jr8jrpmect l 2gul r;v.f-l/h5 . How long will it take to move 12 km upstream in a river flowing lv2lg lrj5. /-p2tcmqhf jrle8 .ur;/6.0 km/h?

  55 mi/h is how many m/s? (1pkxh-o,5l n f8 mi = 1609 m)

  What must be your average speed in ord m+q9y.1 .au i/ntbbag;gj 4cber to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 276j s-qc9v: beim2 p)s5panyb 3(ndt y hours and 57 min. What ispa dy5vcmy :j9pb7nt6-(qi32eb ssn) the average speed of the runner in m/s?

  A car travels 90 km/h. Howtp2q0 *cuxulgymw2v .0r; pz0 long does it take for it to travel 400 km?

  A ly (light year) is the di*pf2,ywf3iizeq)3 sv)x( fyo stance that light travels in one year. The speed of l w*fi ()2 y),fpiseq3xfzyov3ight 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 fogp+vvy sxv u, ;ok0u,:r 4.0 s, how far do you travel during this inattentive pe o,;suvpyg, xv vuk:+0riod?

  If you run a complete loop around dbt2yvr+ :bo4jky,4 han outdoor track (400 m), in 100 s, your average vel,ybkj h2y d+4brtv: 4oocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 15c t n2tmv.wq2t3g9p z.0 km east, then 1.0 km north, then 1.0 km west t nptq3g9.mcz t vtw225o 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. I t6qlh hy+;l/k4t2cg dt 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 wagdk hlth/+ lt c6q4y2;s the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h k+jz+: w)hg4frkcjt1 for 110 miles. It then starts to sk+h:gjzrkw4j1t )+f 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 bc) /c m;pgvvrg, y-+odi b97b100 km/h. What is the average spe pog9v- mbvb7/;i)+g,y cdrbced of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km//vqs0cm fkhkba- xth/9-0fr- h and 2.0 h at 100 km/h. What is her average speed for the trikt0-mhb-v0q-r sckx f 9/afh/p?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mu1 +5fb+ c1qgol ,druji/h north for 750 miles. What is the bclf5d1+gq rj1+uu,o average speed for the trip?

  In a 400-m relay race the anchorman (thesyqi sa2, dfnzs7;96m person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lea,q6ifd97my na2sz;ss d 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 14 s. The ca*y(l ,2sbojijv eog(::x)v kar's average vosv yj v oxi(bj)2le:,(ka: *gelocity during deceleration was 44 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averagej-*0 v35rupykaxm 2ui rate of j- 0mvx 2*5kurpyu3ia$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate b7)65r m wtsej ctj-.gof $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelet lg(x52rh* q)h8h9 kbjy rvg+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 then speeds up w/aib:,eno tg 6uga l;2ith a constant acceleration of ,iu /2b a6tgo n:;gela$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.2 m/s experiences a confuy id8a; z6x4 vk8zew3n +ctn s(ab9;stant acceleration of 8asde(xu34iva yf;c 9nn6k bztz+8;w $2.7 \; m/s^2$. What is the cart's displacement during the first 5.4 s of its motion?

  A bullet moving horizontally to the right (+x dire m+fy0f kpi fjn080d0fction) with a speed of 593 m/s sdm0kj f0i8fyfp 0nf +0trikes a sandbag and penetrates a distance of 93.63 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrierpj59er a o mgsi.99e1t. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assu5i19p temrjge9 .aos9 ming the acceleration is constant, what is the length of the catapult?

  A car starting from r 8s+4i1lvxgs iest moves 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 distaj ,d2usqmpfk;7 63wthnce of 200 m. What is its average acceleratiohd6wsu2jkqf, 3p7 tm;n?

  An object starts from rest and undergoes uniform acceleration. q):qr9 bf5bv dleo0f 2 During the first second it traqqdbb2 le9of) :rf 50vvels 1.1 m. How far will it travel during the third second?

  An object is moving in a straight line wimnozd inex si)64*4 (/9ifwu ith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time? n)(iio snwm9i4*xieu4f d/z 6

  A car starts from rest and accelem(x3nq7 ezmwl x)//ds rates 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 deceler:4:n spz9fi+jzd 0xprate 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 tha/uinyu g,wpt-i ;. -aurhl ow89ou;4ft has been waiting at the intersecti9w;ftw4u o-uu g-,8lio; uiayp n h/.ron starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s o :zuopx + kosaz65h9f3n the surface of planet X where the acceleration due to:3+x6sf9 h 5o zkozpua gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a stw a sh77s5ca6peed of 12 m/s on the surface of planet X where the acceleration due to ga 6 cws7h5a7stravity 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 q jodn 6:cae37 :f(xzwwhere the acceleratioc:wf:n qj x(6 ea7dz3on 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 d,ci 9oeyr 3a5with a speed of 14 m/s on the surface of planet X where the acceleration due to gravec,3d yo5r ia9ity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usuallpq+ 5ef h) izbmyo6,e(mcs 8s030lrrny greater than 0.10 s. If your friend holds a ruler betwl n(s6pq iebm 5zcr3hyr+o 00)sm,f8 eeen your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity j1x (24oc uir9ybq :m+3vq,-d cpvxa cof 19.6 m/s. What is its velocity after 3.00 s?-q+pcx b14jr ouc y3mq29vacv:i,( xd

  A bullet shot straight up returns to its starting point in 13 s. What i z9-e gtos+mq-s the initial speed of the b- egzq+9somt- ullet?

  A ball is thrown straight up with a speed of 36. h w+ 0(br+z*0pfcydzm0 m/s. How long does it take to return w*+p (fzr0yd0hbm cz +to its starting point?

  A ball is thrown downward from the top of a building with aceewqr s*.6 ;tn initial speed of 9 m/s. It strikes the ground after 2.4 *crwesq 6t .e;s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in n b9 1x u--qal/vosvk6jumerical val19sx bou- lvkj/ v6-qaue in the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straighvfoe c,wn5 j7s9qy-2 t;-smi mt up into the air with a speed of 36.3 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0yk*1jh mu*s d ck4yd;) s?

  In Fig. below, what is ts9o(dv v qd6l+2jut (ed8-i vuhe velocity at t = 2.5 s?

  In Fig. below, what is the velocity al 6w znf h;uazyyc5 9lfmldf 65uh-708t t = 4.0 s?

  In Fig. below, what is the velocity a hn k/9(mojv2+ qk87kas95t skkjnzs 3t t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?bcz7ds 50y. pl:p eqy3

  In Fig. below, what is the average velocity from 0 to *bf4 eqiu*-f*s+54qjdhe(tm*m jvqo 6.0 s?

  In Fig. below, what is the accelek*/4 momq7 )ycqxg+)rxuzy8 mration at 1.0 s?

  In Fig. below, what is theo wsw)kz6gw. + w9ha knse9q45 acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0qpghg tfd:; bs bzf85oh,95 j+ to 5.0 s?

  In Fig. below, what is the average acceleration from ;fb.tf:o:f 87o cabyw0 to 8.0 s?

  In Fig. below, what is the displacement from 0 toj (gla5*i ii r,c2y7sv 8.0 s?

Does a car speedometer measure vk )imdj- zjt: v7ui01speed, velocity? {speed|velocity}

  An object can have a varying speed d3qtt:2ock o lrfk99t :.b6f 1npmir,if its velocity is constant.

  The velocity of an objecadw4x1 d: i3ox0pb( ect can be negative when its acceleration is positive.

  If one object has a greater speed than a se1 d 8vvk*dwhx7cond object, the first must have a greater acceleratvxh 8 wdkv*17dion.

  Two cars emerge side by side fromi;w1fn+*m t m9x pcd2m a tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed 9tq hv q*31u5o6poh*6skg+s mne yuf5as its acceleration decreases.

  A baseball player hio,s2,th0 jxd lts a foul ball straight up into the air. It leaves the bat with a spe,02h, st xdoljed 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 happen18bvb. zjgxwh-ev65, .: foni hdu9y bing to its acceleration, how does it change if air frich h1, ive.dx8b9:vgubow 6 f .byj-nz5tion is ignored?

  As a freely falling object speeds up, what is happening to its ac,pmz rws:,yz9celeration, how does it change if air frictiony z, ,:p9mrwsz CAN NOT be ignored?

  An object that is thrown vertically upward w j,n2y ri2x(kvy(6 hgnc *ik1rill return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciy*gi 6kj k(2cxi2 n,vr1hy (nrable, how will this result be altered?

  An object can have zero velocity and nonzero aczpt yty j/-t1v :i 9t*/(qv1j,ak sttfceleration at the same time.

  An object can have nonzero velocity and zero acceleratpuou5qn42g c4 ion at the same time.

  An elevator moving from the second floor to the fifth1 dzo(yenf86 /o 5juhwhgt5 )c floor making no stops along the way has zere5ctdo 6h1nj y/5 wh8z)(gu ofo acceleration all the time.

  A rolling ball moves fromnocx/wjs8.r. j(o9 ji,s sy-r $x_1=1.9 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. 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 $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight qzgynac8 25z7complete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.8 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 a1 p.dr- yk0hv2zp0dvti uwn2b:0ax.u,6 bcud straight line, moving 113 m away in 13.8 s. It then turns abruptly and gallops halfway bac,b.00nwu10pa.pyru2kzidh - t 2v v:dxdu6 b ck in 4.8 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 from p.3x4 rz1ih2 yqoqc 5j$13 \; m/s$ to $24 \; m/s$ in 5.0 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down from h7ui i;cfg:8u$19 \; m/s$ to rest in a distance of 66 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rea1 g2k5/o3x1uz67e+cc-wd s )kznv/dr dg eexm ch a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter)hz/ucx-z. pg can burst out of the blocks to essentially top speed about/.uz-chzxg)p $11.3 \; m/s$ in the first 12.6 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 uniformly from atm3w3x.sld4(r x l- lg speed of $17 \; m/s$ to rest in 5.66 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 o akvye-qa7 3i7n the highway. Assuming a 7 -eavk3 7qyaideceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trnc0bn j6p yn/6uck 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 miz/ ksdry lqtw)w -i9:-n. After exactly 27.0 min, there are still 1100 m to go- )lkyti dqw s/rzw:9-. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$