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6 February, 14:15

Estimate the change in gravitational potential energy when a person with mass 80 kg rise from bed to a standing position. Assuming that the center of mass of a person is elevated by approximately Δh=0.50m. Express your answer with the appropriate units.

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  1. 6 February, 14:49
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    change in gravitational potential energy Δ PE = 392 J

    Explanation:

    given data

    mass of the person m = 80 kg

    height of the centre of mass Δh = 0.50 m

    to find out

    change in gravitational potential energy

    solution

    we get here change in gravitational potential energy that is express here as

    change in gravitational potential energy Δ PE = m * g * Δh ... 1

    put here value we get

    change in gravitational potential energy Δ PE = m * g * Δh

    change in gravitational potential energy Δ PE = 80 * 9.8 * 0.50

    change in gravitational potential energy Δ PE = 392 J
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