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27 May, 14:30

A tennis player swings her 1000 g racket with a speed of 10 m/s. She hits a 60 g tennis ball that was approaching her at a speed of 20 m/s. The ball rebounds at 39 m/s. (a) What is the magnitude of the change in momentum of the tennis ball?

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  1. 27 May, 18:27
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    (a)

    consider the motion of the tennis ball. lets assume the velocity of the tennis ball going towards the racket as positive and velocity of tennis ball going away from the racket as negative.

    m = mass of the tennis ball = 60 g = 0.060 kg

    v₀ = initial velocity of the tennis ball before being hit by racket = 20 m/s

    v = final velocity of the tennis ball after being hit by racket = - 39 m/s

    ΔP = change in momentum of the ball

    change in momentum of the ball is given as

    ΔP = m (v - v₀)

    inserting the above values

    ΔP = (0.060) ( - 39 - 20)

    ΔP = - 3.54 kgm/s

    hence, magnitude of change in momentum : 3.54 kgm/s
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