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21 January, 12:11

A 2 kilogram object falls a distance of 5 meters. How much potential energy does this object have before it falls? How much work is done on it by gravity as it falls

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  1. 21 January, 14:14
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    Given:

    Mass of object, m = 2 kg

    Distance, h = 5 m

    To determine:

    The potential energy and work done

    Explanation:

    Step 1: The potential energy of the object is given as:

    PE = mgh

    m = mass of the object, g = acceleration due to gravity = 9.8 m/s2; h = height

    PE = 2 kg * 9.8 ms-2 * 5 m = 98 kgm²s⁻² = 98 J

    Step 2: The work done by gravity can be expressed as:

    W = Force * distance = F*h

    F = mg = 2 * 9.8 = 19.6 N

    W = 19.6 * 5 = 98 J

    Ans: The potential energy and work done = 98 J
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