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10 January, 17:52

The Washington Monument is 169.20 meters tall.

A worker assigned to the restoration of the Washington Monument is checking the condition of the stone at the very top of the monument. A nickel with a mass of 0.005 kg is in her shirt pocket. What is the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument?

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  1. 10 January, 19:21
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    Answer: K. E = 8.3 J

    Explanation:

    The given parameters are

    Height h = 169.2 m

    Mass m = 0.005kg

    From conservation of energy, at the top of the monument, the total energy will be kinetic energy which is equal to the potential energy. That is,

    K. E = P. E

    And

    P. E = mgh

    Where g = 9.81 m/s^2

    Substitutes all the parameters into the formula

    P. E = 0.005 * 9.81 * 169.2

    P. E = 8.2908 J

    Therefore, the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument is approximately 8.3 Joule.
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