A 0.2-kg billiard ball that is moving at 9.8 m/s strikes the bumper of a pool table and bounces straight back at 2.9 m/s. The collision lasts 0.05s. Calculate the average force exerted on the ball by the bumper.

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  1. find the change in momentum
    0.2 ( 9.8 - - 2.9) = 0.2* 12.7 = 2.54 kg m/s
    force = change in momentum / time = 2.54 / 0.05 Newtons

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