Suppose that an object travels from one po:3og io8vkt4hcb )1adint in space to another. Make a comparison between the displacemenoh8 :ag1kbd c)4iv 3tot and the distance traveled.

  When is the average velocity of an object equal qh5), 38 hrvg2ij+5a2ch mcor r/oivke5ff5pto the instantaneous velocity?

  A new car manufactur3w3t e4 2/djd*) red;vbnp7n u0pxf rcer advertises that their car can go "from zero to sixty in 8 s". This is a descrid3rjnpfv 4we/ uer*73tpdxb;c d)n 2 0ption of

  An object moving in xg(k8 :c dvzm1the +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 direction) begins to sloobmc- v t fg,tjy)w42(w down as it approaches a traffic light. Make a statement concerning its ag ,2 jm )fyc-t(tbwv4occeleration.

  Suppose that a car traveling to the West (-x direcv7(nhu r1d 46/todr qrp5: ktxkc r.h+tion) begins to slow down as it approaches a traffic light. Make a stat+:/nro 6rd1q45u 7rr.h c(hktkxdpvt ement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statementu88) yof cgpp/ concerning its accg)p yup8of 8c/eleration.

  If the velocity of an object is zero, does it mean that the accelernh)vd ru.d/b3ation is zero? Support your n3v.) hud b/dranswer with an example.

  Can an object's velocit-; p: i7u9ctm;wgbl2d+ kxqcmy change direction when its acceleration is constant? Support your answer with an exa7pl x: ut ;2dmbg-+w;ki9cqcm mple.

  Suppose that an object is moving with constant ar 28 jeob7hc9acceleration. Make a statement concerning its motion with res 8ba7 jeo92crhpect to time.

  Can an object have increasing speed while it*)+ gibnza1j :c5*e odiy2ip ys acceleration is decreasing? Support your answer with a*+y*iinepc :12gz ibo a5d) yjn example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Mag;-x)/a-w2gdbb zlpn cu 9d0 fke0wg dzbbfl-2-x9na)cg d/p ;u a statement concerning its acceleration.

  Under what condition is average velocity equal to the average of2eziy 9pmij(8c4 ,r+e i0ketk the object's ine4(k9r0pyz kii+ 8mct iee,2jitial and final velocity?

  Objects A and B both7 ed4 0y5 f+ww4hllbls start at rest. They both accelerate at the same rate. However, object A accelerates for twice thslw4ywhb0e +4f7l5 lde 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 both accelerate 6+j.(fjd-f 7 j8xb v:lnjeyvsat the same rate. However, object A accelerates for twice the time as object B. What is the 6+- v (jex.vflyj bjsj7f8n:ddistance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the abswryue /dzq;2 h a::ja-ence of friction, which of the following is true concerniny- uw;zeq:h:jaa d2/rg its motion?

  When an object is ree-d*u/ 4ymj;iadf 67w wp *a/gckogm7leased from rest and falls in the absence of friction, which of the following is true concerning 6 pf*e7adig/*;gmyw k -/oam4wcuj d7its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocitd3oi wico:(b3yc+ xyzffu2u )) u:ct: y and the acceleration when the ball reaches thecdz2 t (3xyfi+:yuob3f i: co)w:uc )u highest point.

  Suppose a ball is thelt -esz/i5 ten9 .1ozrown straight up. What is its acceleration just before it reaclt -./e5sn etioz9z e1hes its highest point?

  Suppose a ball is thrown straight up, reaches a maxi0s,/2npj928wi syrp o a0bosv5nta7 v mum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball va pna2to p8wi7sbs09/rsjyv 052o n, is going up.

  A ball is thrown straight up, reaches a maximz(8zc r0i vojo53o .8q1 gjgjuum height, then falls to its initial height. Make a statement about the direction rujzg(q8g o3o1.ojcz8 i0 jv5 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 st l rzn2ptbydok :co6ghk6w c/1jn681/atement concerning its accelerationh 61nc/z 1t6 lkwgk:b8c jy2d/rnpoo6.

  Suppose a skydiver jumps from a high-flying plane. What x 1fx f r(iv(+iv iu8tzj*i4t7is her acceleration when she she reaches terminal vel*ftr txf8i( vv7iu z41(ijx+ iocity?

  A ball is thrown vertically upward with a speed v. An ide(abze d,; hw3k, kxdq;zo g3a1ntical second ball is thrown upwar( ; d,aqhbwzkg;1ex3 do,z3 akd with a speed 2v (twice as fast). 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 frhz5v5 df1k u eeu)bl *jklml9rfe:51/om the top of a building. One second later, ball B is dropped from the same buildv5)r:kbulf/1 jl*le15uz59kme h f deing. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One xzytujjngsy5o mz l1 2* 3()/gsecond later, ball B is dropped from the same building.m)yutzygx*j/ z12j 3 n5slo g( As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is p0fq3 t g0piz4,6 zo3b+nnudqthrown up, and the other is thrown down, both with the same iniq, 60nt 3 0i+ufogp4bdzzn3qptial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second z65mtyx- mbg.wog qx7 8qa y30brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of t3 mwgtoqmxqb78ya. 0g 6xy5z-he two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The8rt1n kxyzzydbb/75 hi+mv6- position versus time graph of thix izt+ 8-b5r/ykd176z vnmbhys object is

  An object is moving with conjlxh p0h;cn 0pcfgsi 7fnj9*. o ,;vw-stant non-zero acceleration in the +x axis. The position versussjfx0 .,iw * n;7ghp; -0oc9phl vjncf time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The1nr 3 nk hnusbp2*cx8bk0213 tvdpo,y*xytm5 velocity versus time graph of this ovyu*1xp btos krtc 32k8,*15 m d nn0n32bxphybject is

  An object is moving with constant nd*b zts:(2h1acs mvn oj 10)vson-zero acceleration in the +x axis. The velocity versus time graph of(b*1n dozsss cvhvt)ma20 1 j: this object is

  The slope of a position versus ahrnn cb87r14 time graph gives

  The slope of a velocity versus time graph8yxka2,ol /vfd vap2jr74lm.6u /mwv gives

  The area under a curve atf r11nk 4lh att*a0(in an acceleration versus time graph gives

  The area under a curve in a velocq hishhn 4b6z:a/i:)q c, rupx2 1yno0ity versus time graph gives

  If the position versus time graph of an objecqp7e) + 0 otx1 c.)ohcd:aprqvt is a horizontal line, the object is:vex) ar1 hcopt) qqpco+7d0 .

  If the position versus time g ar 9v*x)uwtq,8v4q ukraph of an object is a vertical line, the object isuqu qav,89t4rvw x* )k

  If the velocity versus time graph of an objectz ch0y1a 1zp)b is a horizontal line, the object 1zy cbaph01)zis

  If the velocity versus time graph od5s nm43 nu5wlf an object is a straight line making an angle of 30 degrees with the ds54w5n ln 3mutime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trh;h/1jw+ xzu vaveled and twz+/hj u1x;h vhe magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wi7x(t ghe0dp: sll it take to move 12 km upsgs7dx e0t (hp:tream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 0bgcnj7+w mr xl8-hdd)/3tm bj(0qobm)

  What must be your average speed in ox d3wg(cyc2)-osn 1deb+ j hl7rder to travel 350 km in 5.15 h?

  A runner ran the maratho.cg iw8 :,sr ul/bv/ua2md v;rn (approximately 42.0 km) in 2 hours and 57 min. What ic :u , bv.w8rvaimgu2d/r /l;ss the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take x.h:r t (ol8gjdoo9 9afor it to travel 400 km?

  A ly (light year) is the distand4eoj av +grg-wbc7zly91+:;;owinbn8 h lu ;ce that light travels in one year. The speed of light dv;bu7 w+on;zej1lbho i;y+-gg9l 4a:r8wn cis $3.00 \times 10^8 \; m/s$. 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 rz0zgk 4i e;l7xoad and you look to the side for 4.0 s, how fai xz4ez;g0kl7r do you travel during this inattentive period?

  If you run a complete loop around an outdom;.scu pl rs06or track (400 m), in 100 s, your average ve6mp sus0r.;lc locity is

  A polar bear starts at the North Pole. It le 5lx:hewy i5rv (p9*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 trl (lw ipryv9e5:*eh5 xip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km smkse2 cu z5l*6outh, then 1.0 km east, then 1.0 km north, then 1.0 km west to ret s*62zklc 5umeurn to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a wh*6a9ujd pgq+d7-(9 he hbmfpeekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutep qh +g7f( m9pb-9ha*u 6jehdds. How far is your hometown from school?

  A motorist travels 160 km at 8o3wah7s 0w (rv0 km/h and 160 km at 100 km/h. What is the average speed of the motoristw7(vosrw0 h3a for this trip?

  A motorist travels forljvri2e. ,vr9v8xcd, 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed fovrl9er ,j ix8 ,vdvc.2r the trip?

  An airplane travels pd lab)6cilrq7) 47xfat 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed fp l)qfi7bc d )4ax67lror the trip?

  In a 400-m relay race the anchorman (the person jcj* 3hne /t53ot2 nhqwho runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman fohn jn35c q oteh3j*2t/r 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 unifor53vo3 puo w5hvmly and comes to a stop after 9 s. The car's average vel 3uv 5ohov3wp5ocity during deceleration was 78 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed frogj8 1uk3e6:e r*ahxw fm 100 m/s to 160 m/s, at the average rate of re8:16gu3 kx e*hjwaf $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the u8n 0l;pgwh o .vh+/jqrate 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 acce)wd3v7t8+pe jdi rv*t lerates 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 witbm um,m2io1a9 h a constant acceleration 9o m b,2ai1mumof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial veloch)cts84ei:*q,k js e0me v ec1ity of 3.6 m/s experiences a constant acceleration of1 qtv jch:8e,k)mse*eeis 04c $3.9 \; m/s^2$. What is the cart's displacement during the first 6.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed ofq3.f 9nauro9nei/q ..oxg *t( uzvh, w 508 m/s strikes a sandbag and penetrates a distance of 90.62 cm. What is the a.iw,xz9 nr.9fo 3/n.q ueha vt q(*ugoverage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fr,v pm e:b nhndarr5:ry.kifu)1tis (462ar4 dom 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 m)p2 h.k:4i 1yarutid 4(ve sr:b5rna,fdnr 6 acceleration is constant, what is the length of the catapult?

  A car starting from rehlolin0:gsr) n5 6ty+k h0 l-+rns df8st 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 distance of 200 m. What is its average,98sj+t/yx cu .zgu05vondr82 eev wy acceleratio8vuw t +duv 5e,r.zgsc/802e9xyjyn on?

  An object starts from rest and undergoetj,z0( l o(npys uniform acceleration. During the first second it travels 6.9 m. How far will it travel d,lpo 0yz(n(tj uring the third second?

  An object is moving in a straigsmrs6p yb 0/:z(5+nfsu,fy owht line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds l/,:bzn0m fso+fp6(5uysw y sr ater it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly arvfza/3ia: * yz9p :hyt $3.0 \; m/s^2$. 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 d/w *80dbdt68 8 sk fzrxtgehg,n0:fy xry 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 that has been waiting at (3+ 4gfqrvgoi the intersection st4rgvi+qf o 3(garts 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 pe m688-f5fm0d byrck12 m/s on the surface of planet X where the accemb6 05 8fm fpcrde-ky8leration 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 pkvj p7qz.c8m 4lanet X where the acceleration due qjm7 8p.v4 ckzto 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 surfacxpua,e:- 04blqw1 jo le of planet X wherwjp4 el1bq,:lo0x ua -e 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 of planet X 0l5q(zf 9jobhwhere the acceleration due to gravity is0 zjoq9f5(l bh $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If y kqwk+ czb9 ag7o3dc92ena -t+our friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you ca na+kwg+e2 b7docc- 3kzq99attch it?

  A ball is thrown upward at a velocity oveeo 017sn e0.opv6wui+tpj4 t a- i-vf 19.6 m/s. What is its velocity after 3.00 1no 0-.t iiwv7oa+tu40 v6e-jpesvpe s?

  A bullet shot straight up returns to its starting point in 13 s. What is tkxdd ,y0g8ix r+ (ph9whe initi (+p,0y igdkh 8xdrxw9al speed of the bullet?

  A ball is thrown straight u:8w1a1kf2z xyf nwff) p with a speed of 36.0 m/s. How long does it take tofyk ffxf:n )128za1w w return to its starting point?

  A ball is thrown downward from the topnne:tm xdm;n9 s: /6gb of a building with an initial speed of 12 m/s. It strikes 9: bednngm 6/:tx;snmthe ground after 7.6 s. How high is the building?

  A ball is thrown straight up with a speed of 1(8plto bum1+0d se0.xdg6m.yo vwrm30 m/s. (only fill in numerical valld(m1m 0vdt081pxgs.. m6ruwb yeo o+ ue 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 straight up into the ai: 9 oj9txx ephyerq ;dzfpvx/d0+x6*;r with a speed of 22.6 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what nzg))qz w- vx8cz f-i2is the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2o r.+x1+p0khnqq s9js.5 s?

  In Fig. below, what is the veloct1srsoqdvb, g p9,guv5jx 982 ity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.51fgpt 7h .t/q9iz7vk y s?

  In Fig. below, what it xu u c.t*,23fntgo+xs the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to (gxbuzt -:;dc6.0 s?

  In Fig. below, what is the accelr6jkv6v(zs1zlz-bpq-uxv 51 eration at 1.0 s?

  In Fig. below, what is the accaga )euen3t;aht 4q 4s5zud,by(x u)9 eleration at 3.0 s?

  In Fig. below, what is vfu+ sf7w)v64*r asolf 4mwi) the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8a /tm0ztav/s ).0 s?

  In Fig. below, what is the displacement from 0 to 8ac k 9lupqcok9 b.*.l5sf0ph0.0 s?

Does a car speedometer measure speed, velocity?f vndg-sln ,+3 {speed|velocity}

  An object can have a varying speed ife8ei 1r j.5hmi its velocity is constant.

  The velocity of an obaz p+1khgmu/3rx8(oq,ve e0 kject can be negative when its acceleration is positive.

  If one object has a greater speed 2sjrt.x .:rxqoj5u0i than a second object, the first must have a greater accelxxor02.jj r .uts:i 5qeration.

  Two cars emerge side by side from a tunnel. Car A is 6o bu c1rt81hw8 0hgxwvr7g 1otraveling 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 a gtc,o(h o9:5dunw +uwoq h*+qs its acceleration decreases.

  A baseball player hits a foul ball straight up in*dk4 wkzcqq szwe f7o.25.+ 7 jo6ssbnto the air. It leaves the bat with a speed of .dsco qwsw4f2n+ez67 zs .5kobj7* qk $120 \; km/h$. 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 itsbqnt8 q(f2n i1 acceleration, how does it chbt(n8fnq q12iange if air friction is ignored?

  As a freely falling object speeds up, what is q* wfcw+4pf hv8v 3p+vhappening to its acceleration, how does it c*8vc3pqv fpvh4 w+wf+hange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its ozr w4+4(3ll bivsvg0olc-mb7riginal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be alterlcll0 rmv- ogv7i(s3bw+4b4 zed?

  An object can have zero velocity and nonzero acceleration at the same ti9sbk p )yesd;*me.

  An object can have nonzerl.d n72rlc)e-kp3hdr o velocity and zero acceleration at the same time.

  An elevator moving from the second floor to thq b v6vp/zk5) icd9i2ws 9lhp2e fifth floor making no stops alon652zcl/i pdwv9svkpb q92i)hg the way has zero acceleration all the time.

  A rolling ball moves from qr-c9pngss 9+$x_1=2.1 \mathrm{~cm}$ to $x_2=-7.0 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.1 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ 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 around a quartpn6cd:xwklu8v:1 r.j er-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.0 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 1 8ti *o02-ufxm-gzdxk02 m away in 13.8 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its averamkfxi*g 8- ox2-tudz0 ge 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 fr) m4ml qme*4qvom $12 \; m/s$ to $24 \; m/s$ in 4.8 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 froes9g*bdi- 5 w, fmy2blm $21 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a n w okau8d ,()ptl5ou1speed of $29 \; m/s$ 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 mwl27;z4ha 7c/xgmhi blocks to essentially top speed abouti wgx/7mmc l h4h2az7; $10.5 \; m/s$ in the first 12.9 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 unifjv4rpf*:ygyfm; ; *q)furs-3zw 5wgu ormly from a speed of $15 \; m/s$ to rest in 5.93 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lk(6e5uj(s1-6ku1jwk dugkgks-q o l2ong on the highway. Assuming a deceleratg65w1 kskkk1(oj6qj(u- gsdul2-kue ion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckb lu, -t/ ew1ae(rwi*x 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 completew3,b6oy 1c nshrhff(;aa he+ 0.al* ku the 10,000-m run in less than 30.0 min. After exactly 27.0 min, thse aaar,w lc 6hbky*uh;o+(hf30 n1f.ere 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?    $s$