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12 February, 05:12

How much work is done by gravity when a pine cone (of mass 50g) falls from the top of a tree, 9 m high?

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  1. 12 February, 08:13
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    Answer: 4.41 joules

    Explanation:

    Given that:

    work is done by gravity = ?

    Mass of pine cone (m) = 50g

    Convert mass in grams to kilograms

    Since 1000g = 1kg

    50g = (50/1000) = 0.05kg

    Height of tree (h) = 9 m

    Apply the formula for work,

    Work = mass x acceleration due to gravity x height

    Acceleration due to gravity has a value of 9.8m/s^2

    Work = mgh

    Work = 0.05kg x 9.8ms^2 x 9m

    Work = 4.41J

    Thus, 4.41 joules of work is done by gravity.
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