Question

a car of mass 1000 kg moving at a speed of 20 m/s is brought to rest through a distance of 100 m by applying the brakes.a)calculate the accleration of the car.b) calculate the force by the brakes assuming that is constant and there is no other resistance.c)calculate the work done by the brakes.

Answer 1

a. V^2 = Vo^2 + 2a*d.
0 = 20^2 + 2a*100, a = -2 m/s^2.

b. F = M*a = 1000*(-2) = -2,000 N.

c. W = F*d = -2000 * 100 = -200,000 Joules.

Answer 2

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