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Math Help - Work / kinetic energy

  1. #1
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    Work / kinetic energy

    A baseball pitcher throws a fastball that leaves his hand at a speed of 36.0m/s. The mass of the baseball is 0.145kg. Ignore air resistance. How much work has the pitcher done on the ball in throwing it?

    I dunno what to use

    W = \frac{1}{2}m{v_{2}}^2 - \frac{1}{2}m{v_{1}}^2
    help please

    the answer is 94.0 Joules
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by ^_^Engineer_Adam^_^ View Post
    A baseball pitcher throws a fastball that leaves his hand at a speed of 36.0m/s. The mass of the baseball is 0.145kg. Ignore air resistance. How much work has the pitcher done on the ball in throwing it?

    I dunno what to use

    W = \frac{1}{2}m{v_{2}}^2 - \frac{1}{2}m{v_{1}}^2
    help please

    the answer is 94.0 Joules
    The work done is equal to the change in KE of the ball. In this case the initial
    KE is zero (zero speed), and the final KE is \frac{0.145\times 36^2}{2}

    RonL
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