Suppose that an object travels from one point in space to anot(;n- b8u b91kvtlom)zy8z )zxq*rpbqher. Make a comparison between the displac-)kmo r bxv*zp88u(z)yqnz 1qlb9t;bement and the distance traveled.

  When is the average velocity of an object equal to the insta5pu jz0y,d6hmntaneous velocity?

  A new car manufacturer advertise8b;-v0p- cge)jyahq f s that their car can go "from zero to sixty in 8 s". This is a description oa hv0) pybcg -;q8-jfef

  An object moving in the +x axis experiences an 4mcv kaf(,ykk88ubff ,o2 s)vacceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slo. j8p0iaorh6fbf.0 gs w down as it approaches a traffic light. Make a statement concerning its acceleratbgi.8f0a0rhsjp6fo. ion.

  Suppose that a car traveling to the/+kp jt03 fppl West (-x direction) begins to slow down as it approaches a traffic light. Make a stpp0/jl+ tp k3fatement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. hf/hq p43-x:v)yt tazMake a statement concerning its ava3ft-t:q)hp4y hxz/ cceleration.

  If the velocity of an object is zero, does it mean that the acceleratiw wmsib76g5.tv c op9(on is zero? Supps.v 5w 76(g9mico pbwtort your answer with an example.

  Can an object's velocity change direction when its acceleration is constanex8u3-,l akpx t? Support your answer wix, - euxk8lp3ath an example.

  Suppose that an object is movf;mzheo b5:m v7x, /ztxlk;(ring with constant acceleration. Make a statement concerning its motion with respecxzvmh5l :k;x m (;/,7boftrezt to time.

  Can an object have increasing speed while ilm(2v ha*1+olarc yn/ts acceleration is decreasing? Suppor*/lc( r hla1aynv m+2ot your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.tg);i vm,g57 osuwf (q Make a statt;gmuog)vq f(5 7 ,iwsement concerning its acceleration.

  Under what condition is average velocy6(yj udz+w l;ity equal to the average of the object's initial and final velocity+wjzdl 6;y yu(?

  Objects A and B both start at rest. They both aco :lgt 1q*vedge2833yytrtf3t 6 tg5n)dpy s5celerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A d28st:3y 5g gn3t 3* qpel1 yett65yov)trfdg compared to that of object B?

  Objects A and B both start from rest. They both accelerate at tvw ju*g6jd5 n (:c2gxthe same rate. However, object A accelerates for twice the time as object B. What is the gvw*t(g5 d un:cjj2x 6distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the abse yct tnf:cwmd3/h;1+ ince of friction, which of the following isf 3i;/ c:+mtnw ycd1ht true concerning its motion?

  When an object is released from rest ar,)dhxdc 8 ok)nd falls in the absence of friction, which of the following))chkor, d dx8 is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement (,+ioakb8axu)cilz zcd4 :j/about the velocity and the acceleration when the balljo dau(8k zlaccx):i,4/+zbi reaches the highest point.

  Suppose a ball is thu0h49 eye; gz1x,bbbp /5mbg xrown straight up. What is its acceleration just before it reacheseh1bx4 /0m zu9pegbg 5xy,;bb its highest point?

  Suppose a ball is thrown straight up, rea o4t+xyes 9g+ nak5 xf,d1i1isches a maximum height, then falls to its initial height. Make a statement aboii1n 4+t9yk fod,sxs g1 xea+5ut the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its init6o2: x3 vz9 hypvoo5suial height. Make a statement about the direction of the velocity and a3p ho2:u6 zy9vxv o5socceleration as the ball is coming down.

  Suppose a ball is thrown downward in -r1d: pkgy ;n1e5e(ah.s 6tft1axo el the absence of air resistance. Make a statement concerning its accah( ld:11 yf1soxgt.- tnpa6eree ; 5keleration.

  Suppose a skydiver jumps from a high-flying plane. Whatdva imq 27be6, is her acceleration when she she reaches td62v,ei qa7mberminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ballf vrtohd)f4es8f,n9 ( is thrown upward with a speed 2v (twice as fast). What is the rati ,4f9frt vdh fos8(ne)o 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 of a building.ageve.ib pl3,a4l 3fqloy1 ( .xq;i7q One second later, ball B is droppefyxae 3l l7v1 b,p qq.i ig(3a;lo.eq4d 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 is dr ick cr(,/(c,clzcxw8oppk ,zx cc iw8c(/c(,rlced from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is throl:0go6ev(q7exr1kzk 27 m k hrwn up, and the other is thrown down, both with the same initial speed. What axkekml vr:17 eg7kqr6(h oz02 re their speeds when they hit the street?

  A brick is dropped from the top of a bi9j 1cglt0zq ;uilding. A second brick is thrown straight down from the same building. They are released q; t gzi9j0l1cat the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero v0u-5xy9ifct korrs (xvn* :*m elocity in the +x axis. The position versus time graph of this object is(yi0*x t -mfr*n u59r :ksxovc

  An object is moving with constant non-zero accel3qg 0mghd,v g6eration in the +x axis. The position v3d ,hqv0ggg6mersus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The vz: i/7xflh5kmut/gp ( elocity versus time graph of this object zi/fplm( u5h x 7/:tkgis

  An object is moving with consc;ti1mp q /.wgd1byui5ecrvm0 p29a7 tant non-zero acceleration in the +x axis. The velocity versus time graph;w y ipr/1igp mbv2ceq mt u9a7.15c0d of this object is

  The slope of a position vi1pnla0-8k-lxde lc th,6* szersus time graph gives

  The slope of a velocity versus time graphy8qgxt f;oj)cex9kpo;1 wa )9 gives

  The area under a curve in an acce6x3qekqvezu xdig ( 6 ,42yjl(leration versus time graph gives

  The area under a curve in a velocity versus time graph givefwpq6y. 7 1(uxb d7voys

  If the position versus time graph of ab 2i00hi+sg 0shge- vyn object is a horizontal line, the object isi0-+ve bssh0g i0 2ghy

  If the position versus time graph of an object is a ve3zzcx73;ls hk vge/z 1rtical line, the object iskgz;/h3v x lzz1s37ec

  If the velocity versus time graph of an object is a horizontal line,aq m 5+lgqcsz7:d )t)p1xf13s oe .grz the object +es md1tqr)zogzs) a 7g.5x:c1 3qlpfis

  If the velocity versus time graph of an q,4y-z s uxss;object is a straight line making an angle of 30 degrees with the time-usq4s; yzsx, axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dis;cna m;j.s5s ytance traveled and the magnitude of the displac. ncs;s;5ajymement vector.

  A boat can move at 30 km/h in still water. How long will it tavhms0ut0h 99 c(6xab oi)8y xvke to move 12 km upstrea9(hxmsv0oy)ti0a c8x b u96 vhm in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =b7,zn0v p6ltfw j f2p13ek0fb 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 h1*o s,bkaw3 lt mpvu6(?

  A runner ran the marathon (akmxin2, o8hv +pproximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runm+i,hov 82 kxnner in m/s?

  A car travels 90 km/h. How 6iofk*-pp0z ((vajohlong does it take for it to travel 400 km?

  A ly (light year) is the distance thatjby50i )7w8 qi xj,izb light travels in one year. The speed of ljiy 87b,wjiqib0 x5z )ight 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 .kf gv2cpwi(l;m4 od/ km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this2vd.g 4imock;pwl /f( inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 wztf r3+:c8de s, your average velocit :3d+8erzwcft y is

  A polar bear starts at the North Pole. It travels 1.0 km so vp9z6dxqlbu tx 68y-;fvg(t-uth, 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 t 9y8z (qtux-ftpxbd lvg;-66 vhe bear's average speed?

  A polar bear starts at the North Pole. It traveh 2*7a;njmt;abn8 wy(ab -r pals 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to retu*a m2ybn;b jhp;wa rta8(-n7arn to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from b + -jtr5p.7mxjp; 8rfp9;jzx;ejrpm 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 minutes. How far is your hometojx;r jpj5-ezpmt 8 m.9rprjf7+; p;bxwn from school?

  A motorist travels 160 km at 80 km/h and 160 kmg db0rn71c-a-c*th om at 100 km/h. What is the average speed of the motorist tm1gn-0-o dab 7* rhccfor this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wha5iezxqrx tnf -)nu,9,t is her average speed for thet,ufq x-r9i5,)nznx e trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north 6b3 .ieddjd,:y id+a zfor 750 miles. What is the average s i.:d3day, d d6+ezbjipeed for the trip?

  In a 400-m relay race the anchorman (the person who runs tt .qxhf (.ms )*c+jbjthe last 100 m) for team A can run 100 m in 9.8 s. His rival, x.q( +tjm.*hcj t)s bfthe 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 and comeejb60wtf* kbw* .ozztr l 1s:r0 fj0a9s to a stop after 9 s. The car's average velocity during deceleration was 61 km/h *6or*elf tfz ztrwk0w9jbj:0 .a0s b1. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 kx -ainu)a9 3cv (q,kzg*ev1um/s to 160 m/s, at the average rate of vkx-g *u,31 9eik uazavn)(qc$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ranl (jepq*ah4-te 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 accelerat1rwhm-+nlmc,o(j- h-z4r1 r4i aa rqt es 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 -akr2f b /.a5h l3b rvh* :ldsoer:n(oconstant acceleratiol/: 5*: orvfe.hk -ad 3bs(orbrn2alhn 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 1.7 m/sl b z4+te;+ceu0fy3,uk lq0 g(hsi:xy experiences a constant acceleration oku 03 zc;gs yh(eu+t:yi, lqlx+b4 f0ef $2.4 \; m/s^2$. What is the cart's displacement during the first 8.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 338eja rcgl.2 u38 m/s strikes a sandba r.ucj3e2l g8ag and penetrates a distance of 25.40 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane imlv,g3dc+ j9(;ek gwxr o0b38 xptkgxls,8d ,s launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this re, gxe kpgb3;grwcdjl,8+ l t09x( 3,xdkvs8mo quires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest mbd3wx- d;rp8z -duea-oves 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 8055pb en-,+ke 5,thht 2hfe-0rva t ysx m/s in a distance of 200 m. What is its average accelerationf+-ht5htyx5ren,t be, kh2a5esv0- p?

  An object starts from lojnpg;mme -ei w-8.*+: euucrest and undergoes uniform acceleration. During the first second it travels 7.1 m. Hoe8+ l- unu;cwj*e-pge mmi:.ow far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initialljprcylik)2 c5 f +cz45y it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it mo) pc5 cl5k 2zc+irfj4yve during this time?

  A car starts from rest and accelerates uc /pnnz)rbpk*e -p0k1niformly 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 decelerate at abou8:babke* j,t ax6jm2 gt $5.0 \; m/s^2$ 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 lighr(-a*ye)k wejaj;r l( t turns green, a car that has been waiting at the intersection starts ahead with a constant accyajl e)k;ar*w(e(j r- eleration 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 4c2h;.irb klw surface of planet X where the acceb.2l;rc ik hw4leration 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 ofo*m1 dzf4 c 8qmuf(1hf planet X where the acceleration d4z mh8f(fc1dum*1o qfue 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 ,vgivhk k,a ,pr *tuxfiv65;l5 hf3k6speed of 15 m/s on the surface of planet X where the acceleration due g5k; k vxkhi3p66ta,v fl,vri*f, h5uto 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 )6w wiuk;y+xqwith a speed of 14 m/s on the surface of planet X where the+w6y)x uiqw;k acceleration 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 greater than 0.10 s. If your frhssi;i lzck1+ b3j76,g beq z4iend holds a ruler between your fingers and releases it without warning,6 eiz1+zkbh43lisq s;7cb g j, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upwq9fbvfc4 *id +7k or2dard at a velocity of 19.6 m/s. What is its velocity after 3.00 s?7vf bdd9*qr+ i 42okfc

  A bullet shot straight up returns : qzf**1mvrdv/m.miz to its starting point in 5 s. What is the initiazmvf:mr* v1zq/d.m i*l speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does bi llyopqil t;p8.x .d8u+ :5zit take to return t:bt+p xi88ldpzyq.l.io5 lu; o its starting point?

  A ball is thrown downward from the top of a building with an initial speed ofy6x6b - e( .ehopnbi/x,a:nvf 5 m/s. Ib ixe6 xyn./,e f:6v(na-bph ot strikes the ground after 1.8 s. How high is the building?

  A ball is thrown straight up with d2p s5uv)qt-k;j7 gvp a speed of 30 m/s. (only fill in numerical value in the blanks)v;qu- )pg72jtdk5 svp
(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 with a spelxz8k 2/hwcd ;iv6, rjgr-fp. ed of 48.9 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is t/u ihx+ p16xxshe velocity at t = 1.0 s?

  In Fig. below, what is the veb3 k4ix6 kgfpu- n,rkx6w t5(clocity at t = 2.5 s?

  In Fig. below, what is the vendggq7y77px qw cyp5*3j vs(/s: vd;q locity at t = 4.0 s?

  In Fig. below, what is the vh- 50i/lsmuyadjp zrc, 98d+x elocity at t = 5.5 s?

  In Fig. below, what is the average lw fe47:br cs xzg z,(z92zh0gvelocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity froml2dbf91l 1 t k69-lhi-z(x np apid*ig 0 to 6.0 s?

  In Fig. below, what is the accelerationh/h l)mcwv5. d at 1.0 s?

  In Fig. below, what sgbv.8/ gm+f jis the acceleration at 3.0 s?

  In Fig. below, what is*ylfe50- girvs:q:m r the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 099n9vtk) 5 djbdvbqpy jx24: a to 8.0 s?

  In Fig. below, what is the displacement from97e23 c b*oua(yqycrr 0 to 8.0 s?

Does a car speedometer measuref)g6uqki+1w d6dh; cuk c:1hlo xn-n) speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is a/f2d ma: .jqwk,-)mekyuw + py7z g3jconstant.

  The velocity of an object can be negative when its acceleration ilq*n2b m,) amvs positive.

  If one object has a greater speed than a second object, thozjb55wgu-thljx -( c5)xpq)0t e 9lne first must have a greow0-jj-xn(z5cu)p 5qlbl h9 ttx5g ) eater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with avsmg5a;e2e ) d5u9 s7 smqbs0a 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 accel v -so7jnsl:rx27(jbl eration decreases.

  A baseball player hits a foul ball straight up into the air. It l (f/i*uu ksu :o0tfv9304hh+hdrpchleaves the bat with a spef4pcsi0o hl ukd9fh0:u (vrthh*/u3 +ed 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,ba v-m+) giv.p what is happening to its acceleration, how does it change if air friction ib v-).v+ apmgis ignored?

  As a freely falling object speeds up, what is happening to its accez1 jiys9r;+k/jzc si;y9 ;ap38v rj krleration, how does it changeijrjp scsk3rk/v z;89;jayi19z+ ;r y if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origihxho g5 (*hap;nal position with the same speed as it had initially if air resistance is nego5hh a;*pghx(ligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero ve*5 bpnh:p1t dh*erb 0sz( 5krnlocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same tim; gn. my6 sod9e:,myfx zpy.o5e.

  An elevator moving from the second floor to the fifth floor making no st7*f 6fggmwb1 dr44en kops along the way has 4m gff4nerwb16g*d7kzero acceleration all the time.

  A rolling ball moves frotz 1wchrt:t 67m $x_1=2.6 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.8 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mny:lom.nn: 2 vile ($1 \; mile = 1609 \; m$) track in a total time of 7.6 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 8xbqjp8 1p(5ts7 m away in 9.8 s. It then turns abruptly and gallops halfway back in 4.x8pp51b(qsj t5 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 fromdxz wcybnq,1pt8 5 /-r $12 \; m/s$ to $24 \; m/s$ in 5.8 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 from njf7;etdmh5(3fl z gjdn7it3. ge- )x $17 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed oft w8b+m cu37 u-r;twnc $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinte6r; n6ril)jmy r can burst out of the blocks to essentially top speed aboutrjlm;r6 ny )6i $10.9 \; m/s$ 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 frovh 9 eea7u8wn /+0tgmpm a speed of $20 \; m/s$ to rest in 5.29 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid maf5)inc(1f5ilz x bf,irks 92 m long on the highway. Assuming a deceleration of icfnb5z,lix( 5) f 1if$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gop:j6cl ge8jn,e)t :a ging $25 \; m/s$ 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 ruc-)6db dt5wbssc3u2c n in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate at wc-ccdtsd bus b625) 3$0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$