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13 November, 07:20

A 64.4-kg firefighter climbs a flight of stairs 21.3-m high. How much work (in J) does he do?

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  1. 13 November, 07:28
    0
    Work done by firefighter = 13456.57 J

    Explanation:

    Here work done is equal to potential energy gained by him.

    Potential energy, PE = mgh, where m is the mass, g is acceleration due to gravity value and h is the height.

    Mass, m = 64.4 kg

    Acceleration due to gravity, g = 9.8 m/s²

    Height, h = 21.3 m

    Substituting

    Potential energy, PE = mgh = 64.4 x 9.81 x 21.3 = 13456.57 J

    Work done by firefighter = 13456.57 J
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