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11 October, 21:32

A 60 kg bicyclist going 2 m/s increased his work output by 1,800 J. What was his final velocity?

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  1. 11 October, 21:56
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    Bicyclist initial kinetic energy is Ek = (1/2) * m*v² where m is his mass and v is his speed and that is equal to:

    Ek = (1/2) * 60*2²=120 J.

    When we add the increased work output, we get the total kinetic energy:

    Ek (total) = Ek+W = 120 J + 1800 J = 1920 J

    So Ek (total) = 1920 J = (1/2) * m*V² where V is the speed after the bicyclist increased his work output. So lets solve for V:

    (1/2) * 60*V²=1920

    30*V²=1920, we divide by 30,

    V²=64, and take the square root of both sides,

    V=8 m/s.

    So the speed of the bicyclist after the increased work output is V=8 m/s.
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