suppose you are driving a car down the road at 20m/s on a nicesummer day and you

Question

suppose you are driving a car down the road at 20m/s on a nicesummer day and you suddenly slam on your brakes. the wheels lock upand you slide to a stop. how far did the car travel before comingto a stop? the coefficients of kinetic and static friction betweenrubber and dry concrete are the follow =0.75 =1.0 suppose you are driving a car down the road at 20m/s on a nicesummer day and you suddenly slam on your brakes. the wheels lock upand you slide to a stop. how far did the car travel before comingto a stop? the coefficients of kinetic and static friction betweenrubber and dry concrete are the follow =0.75 =1.0

Explanation / Answer

initial velocity u = 20 m / s final velocity v = 0 m / s accleration a = - g                    = - 0.75 * 9.8                    = - 7.35 m / s ^ 2 from the relation v ^ 2 - u ^ 2 = 2 aS distance moved   S = [ v ^ 2 - u ^ 2 ] / 2 a                             = 27.21 m

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