Suppose that an object travels from one7uj (5wa o5n9ij93bwzyoks:lxn a(+v point in space to another. Make a comparison between the displac39vn 5 kl5(jsuw a( :xanoz+ jy97iwobement and the distance traveled.

  When is the average vel1-w;iwy-ps5 hjpuph7ocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from k4dg q*.0lo3ffxnb,l 9(vi0his/nry zero to sixty in 8 s". This is a descxollg*fhsf0 4i d (q,nb 9vrn./ yk0i3ription of

  An object moving in the +x axis experiences an a3g l * j*dr.j*n 8v)bbrnx*ospcceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to lf0 wr4e ( hsk(2ff7f o3mjr*jthe East (+x direction) begins to slow down as it approaches a traffic light. Make a statement co0f3ek(4jj (smr2h*r f7w f floncerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow d-bx kd0 bpuy63own as it approaches a traffic light. Make a statement concerninbb3yudxk- 6 0pg its acceleration.

  Suppose that an object is moving with a constant velocity. Make a stateme fh 5 y- mvrqshjodvs )5p3u.w76h .sx)c7c3zvnt concerning its sjy d s5u) r-pf) w6v.5.z7ho h33vvchm7cxsqacceleration.

  If the velocity of an object is ze 0 c5-dlejz2)w ;uimbkro, does it mean that the acceleration is zero? Support your answer with an k zdue5)- ;b mijcw2l0example.

  Can an object's velocity change direction when its acceleratic 1 ;kk,vlqx8 +,zosgkon is constant? Support your answer with an exampl, 8c,k1klgzq v+;ks oxe.

  Suppose that an object is moving with constant acce/g qtkpf3:f;m:-ryc8fq :7(sg bbvi lleration. Make a statement concerning ig m r/3b lbv(qcsip;:fft k87qfy: g:-ts motion with respect to time.

  Can an object have increasing nh la j4 s5sz ;u9+.aw0uxsj1bspeed while its acceleration is decreasing? Support youjbnhasw1z 5x9u+u;.j4ss0l ar answer with an example.

  Suppose a can, after an initia1x w*,a zvf;,/uj xanal kick, moves up along a smooth hill of ice. Make a statement concerning its accelex;ja n/x fa,,vz1uwa* ration.

  Under what condition is average velocity equal to the vbye 5i i0z,vpets)f/moesc7d,3,zo4 g 4aq9 average of the object's initial aa7t /d9iebv0 ,zzmesf,qo3g 5ie)4,vp 4yocs nd final velocity?

  Objects A and B both start at rest. They both accelerate at tipf5 ut*g m(tn kcq4 dzjd,8+:he same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B(dj:, 5futm*t8 qpnzick+dg4?

  Objects A and B both start from rest. They both accel4 lwxhfo0dbvma*;p;po z3fh)sb8a 4w( j,nc9erate at the same rate. However, object A accelerates for twicomsc4*4 jp9blz pxwn3;)fwvh8fa (;ahd o0,be the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls 2n,f,d nq*g cpqke3grw n7/d:in the absence of friction, which of the followinge7pg* dg,2/ 3n dnck fqrqnw,: is true concerning its motion?

  When an object is released from rest and falls in the 9.z6 d,4b2jw5tjcb csoc*ugv absence of friction, which of the following is tb2 * 6jd,4wocccbjsu.5tz gv9 rue concerning its motion?

  Suppose a ball is thrown strafi8dbdz6mj+8ao 4+lx ight up. Make a statement about the velocity and the acceleration when the ball reaches the highest poi8+x6b zidjlfd 4a+8mont.

  Suppose a ball is thrown straight up. What is its ac t*2 yregkocs8 :(z3erceleration just before it reaches its highest rs (: rczk3oe8 *2ygetpoint?

  Suppose a ball is thrown straight up, reaches a maximum lh0+l+f4fr,8ge chxnheight, then falls to its initial height. Make a statement about the dinx0hhg+ecrll84f f+, rection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heigh3jfpy )c(:owm4k e q.i:tjs:mo/9kent, then falls to its initial height. Make a statement abouepy cq9jk:t :o:(3ejn m./f)si4km w ot the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistancyq-4r84 pfxz be. Make a statement concerning its acce48-p q4 bzrxfyleration.

  Suppose a skydiver jumps from a high-flying plane. What is her ac:w +znh/cc 0xrceleration when she she reaches wc:r/xz ch+0 nterminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secondb)h ),n( knarb75lygvk8l ; pq ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball7a)kg8nkbh(r ;5) v l,ynbpl q 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 buil+omts4vdm+t6nv f(n -su 4tr 1ding. One second later, ball B is dropped from the same building. As time progresses, the distance bemos6u(mt14tfn v+ - trvsn+4dtween them

  Ball A is dropped from the top of a building. One second later, ball B is dr iy5i*.vib0iu89il dvopped from the same building. As time progresses,uvdl0 i5yb9 .ii*8vii the difference in their speeds

  Two objects are thrown from the tgwx (./;,hidl2ve ghlop of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds ( h,.vx2l; l/wdihegg when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrs lkxsqfy8 0)8own straight down from the same building. Th08 ys)lskq f8xey 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 t)-uyv vahj-+in the +x axis. The position versus time graph of this obj yu-v-t)va +hject is

  An object is moving with constant non-zero acceleration in the +xl;cpbaxn.t 9 cb+t92 :ahvut3 axis. The position versunvtalpb hc a2x3: 9tt9b.c+;us time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. T 9pmwd:+1cip) enjlxz*yt ,x(he velocity versus time graph of thitye:,pz+ j cn 9mdpxi)(*wl1xs object is

  An object is moving with constant non-zero acceleration in the +x ax b /ge*-dzx7mpis. The velocity versus time graph of this object dbx/p-*7z egm is

  The slope of a position versus time*jt7/x1cvm h m graph gives

  The slope of a velocity versus time+deyniias.t *l) 1z6 r graph gives

  The area under a curve xcn*l+ x8yq+u in an acceleration versus time graph gives

  The area under a curve in a venpgvii4 9k9q )fb/ 3tglocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the ajgi ox-r:lg :gdap.t9e.cg m- h3)i0object isa::itr mg-..j)ahgge d-oigp9 l3 0x c

  If the position versus time graph of an object is a vf+s3he( w2v sbertical line, the object is(fsehbw v 2s+3

  If the velocity versusqxx(zg s)t2 :q time graph of an object is a horizontal line, the object isqgxt (zs2 ):xq

  If the velocity versus time graphk )/dae 3lhvk. of an object is a straight line making an angle of 30 degrelk/3d. vek)ha es with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both tyef( ib4c/-+- uiscxsx.ifg 0he distance traveled and the magnitude of the displacement vec-u fc( y fb+0./ixs4g-secxiitor.

  A boat can move at 30 km/h in still water. Hozcoco63 gny j:0w4/ aiw long will it take to move 12 km upstreac yo :c6za 4/wgnjo30im in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? d56 z:5cr to+g:n-jq c:ustcn(1 mi = 1609 m)

  What must be your average speed in order to tragbssm y2 zbs0x87jt 25vel 350 km in 5.15 h?

  A runner ran the marathon (approximately1g2e4szsmjc i5skhelu 1w ,g wj.; h35 42.0 km) in 2 hours and 57 min. What is the average speg us4 e125csh ;hw.zw,l5k3smjj1g i eed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it t5vqlpp+sdz -9 4o(uq oo travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed odnkfhl 2/4mkv17b /u mf light isfk74mhlvm nk2 1/ db/u $3.00 \times 10^8 \; m/s$. 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 arb,(idc5nq+ rnh 3op1nd you look to the side for 4.0 s, how far do you travel during this inattep c3b5r+,ninho1qr ( dntive period?

  If you run a complete loop around an outh2w/64r0xqkllw o iq8ca 0nd4door track (400 m), in 100 s, your average veloci8q0k/rh0w46w ia lxocq 42dnlty is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km c7; j;v.c2vl-x 1uoptdnpt;e: h+lnyiq-3bu east, then 1.0 km north, then 1.0 km west to return -ne -tp: .; npuxdvt3ohq;+v;u72iclyj l1cbto its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eaix3xuu:) 7ndcj dhokyl.06 3est, 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 ahnuduxy3dlkc6.0 x73 ojie:) verage velocity?

  You are driving home on a weekend fro-*ppr/gkf)ype ,; i (.k4 :adz nowunym school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after drizk. p 4rpnwp,id;(ugeayf-o n/*:ky)ving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and,kq b kt xbp2oc/xi+0. 160 km at 100 km/h. What is the average speed of the motorist for this pk 0k 2x+qioc./bbx,t trip?

  A motorist travels for 3.0 h at 80 )6j0t.k x 5khoxqwuj *km/h and 2.0 h at 100 km/h. What is her average speed for the truk 5hk) .6 0xjtj*qwxoip?

  An airplane travels at 300 mi/h south fo/2qmt;f7rspc l /0/rwfi l y7wr 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for t fmt 702c/slr;/yq7wwir/ flphe trip?

  In a 400-m relay race the anchorman (the 4zw 19yfd4 8qpp qjao3person who runs the last 100 m) for team A can run 100 m in 9.d p pyz9foq348q4jwa18 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly an 9pd7feemss 7 50ro:dkl:(gv xd comes to a stop after 13 s. The car's average velocity during deceleration was 72 km/h. 0m f77s x:5(geo des9 kd:lvprWhat was the car's deceleration while slowing down?

  An airplane increases its sc7s)o+)ihff u *sk efomoy*6 gh*y+)qpeed from 100 m/s to 160 m/s, at the average rate of *yis y)oue7)mc6f+oh*o) sg hff+*k q $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratesi i/ 1)bihil5r 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 anddkr *w/umd32x 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. It then speeds up with a constant acco zkz(( 1/tnrpqi,l)celeration of c /pq)l(tz1 kionz,(r $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.5 m/s etzlxf82.v s coig 1f*.xperiences a constant acceleration olf28go v.f sz1cx*. tif $1.7 \; m/s^2$. What is the cart's displacement during the first 7.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 600 3a;8* hzi*h4p fpufliuf3zh5q2 v:yc m/s strikes a sandbag and penetrates a distance of 86.73 cm. What is the average acccfhh yvql; f* :zua5i8*u3h4ipzf 3 2peleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier.r pi5:m v s4p-n)h+msk14inf c 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)-nnf4 sm:ci4r1hspmi v+ p5k the length of the catapult?

  A car starting from rest moves with cc ,ktz0uw a;j8onstant 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 8 r/fp 9c*t4wno0 m/s in a distance of 200 m. What is its average accelerapon /9r*c wf4ttion?

  An object starts from rest ankf vzsvl9h71q 3 -fga;d undergoes uniform acceleration. During the first secondaqvlffgs9k1 h ;z37-v it travels 4.9 m. How far will it travel during the third second?

  An object is moving in a straight line with constant:avl6y3 u 3vxa6ctq5g acceleration. Initially it is traveling at 16 m/s. v lcq6 agvt:5yx3ua63 Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly aj:(tz1 xgq3uv t $3.0 \; m/s^2$. 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 8l(jv1xyh jyrlf wts)( d* 7;hon a dry road can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic lig7vs. d7wnx td.ht turns green, a car that has been waiting at the intersection starts aheads.v dtx7wn. d7 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 whxcy7o,ea+q 7 ith a speed of 12 m/s on the surface of planet X where the accele 7eca7oyqx+h ,ration 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 m/s on the surface of pl, kwb6b 6b/fvuanet X where the vbbb6/f,u k6w acceleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward wi(l+sde 2 ;mu0 kdsdb(5bu4kefth a speed of 15 m/s on the surface of planet X where the accelued sm5ekd2lb0dk4(;+us fb(eration 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 , gmv:ue5h.8c 9k* e vt/whomgwith a speed of 14 m/s on the surface of planet X where t8tugo.wm/c :* 5 h9,evmhgkevhe acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time iswno;)ri2dog9 u. b9ca,r* e ky usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how f*92gu. bk o ;nyw)ro9r, diecaar can you expect the ruler to fall before you catch it?

  A ball is thrown upward acnoseye g65; m1(fgh+t a velocity of 19.6 m/s. What is its velocity after 3.00nshogm e cfy(g 1;65e+ s?

  A bullet shot straight up returns to its starting point in 8 s. Whaxotf *v81n-2s:m nmu ot is the initial speed om vmtsox:u8-fn*2 o n1f the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How l,r;onrz 78v rol3zs 6vong does it take to return to its stal, onrv ;vsorzz783 6rrting point?

  A ball is thrown downward from the top of a building with -wpjaa-h: a r7 23veauan initial speed of 26 m/s. It strikes : -rja au-hae 32vw7apthe ground after 4.7 s. How high is the building?

  A ball is thrown straight up w k*6ib/unboc4ith a speed of 30 m/s. (only fill in numerical value in the bkiu46nbbc /o*lanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up into the air /u,,+ghbgd eawith a speed of 21.5 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the dc;qr,erif -l+f/ zq 0velocity at t = 1.0 s?

  In Fig. below, what is the vtoh;hobv9man (uw ;cg*d 6fwnv *9j01elocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.1 0ye)y7m+tx w;cu)qt,jl yv b0 s?

  In Fig. below, what is the velocity at , ojt:cmg8va -t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?vw1f *4 7 vsmc5jfw-xi,(cm) mxvr x6h

  In Fig. below, what is the averag2)i gbpl13s b9euffbm, ..cwee velocity from 0 to 6.0 s?

  In Fig. below, what is rbs.i /am ;.bsthe acceleration at 1.0 s?

  In Fig. below, what is thea79pf4vdm4xcsu1 hc: t05 jcd acceleration at 3.0 s?

  In Fig. below, what is the average acceleratp.n vwc:kxi -n+a3kwyfr)w+q;czn/ : ion from 0 to 5.0 s?

  In Fig. below, what is the average (a /icfx8v txu+089yzkzx3bl acceleration from 0 to 8.0 s?

  In Fig. below, what is the displace:dyld+vic:mhs /j9g . ment from 0 to 8.0 s?

Does a car speedometer measur 74wxl6xbiaq8l h6v ,ge speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is cont1x vs2ovn:tu;, )99fjdvs odstant.

  The velocity of an object can be negative r 1 rk/:qd czvgdd:-a0n;gg7wwhen its acceleration is positive.

  If one object has a greater speed than a second object, the first 5l b3suxp hf4,)/ uz4.hw ohonmust have a greater acceleratn )hhu fos4lxo . pw/,h4z3u5bion.

  Two cars emerge side by side from a tunnel. Car A is traveling wiq1wm l*:kv; f+vji6mlth 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 k)ksozv1a2 m fza, 6* vm2rkh5decreases.

  A baseball player hits a foul ball straight up into th.ofs xy 1e et.4rw3po2e air. It leaves the bat w1f23.ey t xowrs4ep.oith a speed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happening to its accelerathxr);z3 w:wj wion, how does it change if air friction iwhjxz)3ww; r:s ignored?

  As a freely falling object speeds up, what is happening to its ac wqlf .w/f *:us0u- lqbwvi( 2v4plc5knmey0 3celeration, how does it change if air friction C4(ke20.i0 fl5lwsuw mvvw - byn*3 ufc/ qp:qlAN NOT be ignored?

  An object that is thrown vertically upward will return to its origin.)udu e anq-5dal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how aqed-n5uud ).will this result be altered?

  An object can have zero veloci) e cz41ghaxvqqx.-d)ty and nonzero acceleration at the same time.

  An object can have nonzero velocity and ze9tgz6eo d,-z;a wr:qs sd(n4z ro acceleration at the same time.

  An elevator moving from the second floor to the fiftl.meg7+rtaj v(3 2ekih floor making no stops along the way has zeroimek+g vr.ejt72la3( acceleration all the time.

  A rolling ball moves fgpsn q2w o(a/3rom $x_1=1.7 \mathrm{~cm}$ to $x_2=-4.9 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ 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 $t_1=-4.4 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ar-mjsmo /v3 7 gqrbea(5ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.3 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 110 m away * 7sq;h(kqtn oin 1n(qh7t soqk* ;2.6 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates from:j-f;*hyysr g $11 \; m/s$ to $22 \; m/s$ in 5.9 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 frod f bfo d .o6kvrjdo()*ow:+f2m $22 \; m/s$ to rest in a distance of 76 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of tm rkkk/(2 qe,s sza-opf9(l2$30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of fi .tcvm8x*kkp/7buig su k*pb+3 k ;1the blocks to essentially top speed about vuct**.i7 kg k b1u;m fbi+k8 /pxpk3s$10.7 \; m/s$ in the first 13.0 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 fkj. ;oz 3y0) :cmqrw;ep e(dzprom a speed of $15 \; m/s$ to rest in 5.55 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 9ku. rq2wn h(b:s:uh ej2lnn(highway. Assuming a deceleration o2hn : nq9 (uj.hlbru2skwen:( f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc y1x i;ff4mf.ck 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 exacx8 q:co3,wo vq gfo8j1tly 27.0 min, therov 8qgw3ojx8:ocq f1, e are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$