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9 October, 13:38

Whats the velocity of a ball falling with 100joules of kinetic energy and a mass of 2 kilograms?

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Answers (1)
  1. 9 October, 15:44
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    Short answer: v = 10 m/s

    Comment

    This is just an application of KE = 1/2 m v^2

    Givens

    KE = 100 Joules

    m = 2 kg

    v = ?

    Formula

    KE = 1/2 m v^2

    Substitution and Solve

    100 = 1/2 * 2 * v^2

    100 = v^2 Take the square root of both sides.

    sqrt (100) = sqrt (v^2)

    v = 10 m/s

    Comment

    There is no KE unless v > 0.

    You may have PE when v = 0, but not KE.
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