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24 September, 17:19

A 2.50 kg ball moving at 7.50 m/s is caught by a 70.0 kg man while the man is standing on ice. How fast will the man / ball combination be moving after the ball is caught by the man?

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  1. 24 September, 20:37
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    Momentum p = mv is conserved.

    before: p = 2.5 * 7.5 + 70 * 0

    after: p = (2.5 + 70) * v

    p before = p after

    2.5 * 7.5 = (2.5 + 70) * v

    v = 2.5 * 7.0 / (2.5 + 70)
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