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22 January, 17:53

An 80-kg man climbs a 6-m ladder in 12 seconds. what is his average power expended?

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  1. 22 January, 17:57
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    If the ladder is vertical, then the work done in ascending equals his increase in potential energy.

    For a man of mass (m) climbing height (h), the PE is (mgh), where g is the acceleration due to gravity.

    If he does this in time t, his average power (rate of working) is:

    mgh / t

    = 80 * 9.81 * 6 / 12

    = 392.4 W.

    If the ladder is not vertical but inclined at an angle the horizontal, the power is mgh sin (a) / t.
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