) A car is traveling on a straight, horizontal road at 20 m/s when the driver slams on the brakes. The force of friction between the car and the road is 900 N. The mass of the car is 1800 kg.
(a) Make a free body diagram for the car on the set of axes provided.
(b) How far will the car go before stopping?

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  1. (b) f = m a ... a = f / m = 900 / 1800
    a = .5 m/s^2

    so it takes 40 s to stop ... 20 / .5

    ave velocity is ... (20 + 0) / 2

    distance = v * t

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