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15 June, 22:52

What is the potential energy of a 3 kg rock sitting at the top of a 21 meter high cliff?

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  1. 16 June, 02:12
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    618.03 J

    Explanation:

    Potential energy can be calculate using the following formula.

    PE=m*g*h

    where m is the mass, g is the acceleration due to gravity and h is the height.

    In this situation, we have a 3 kilogram rock on a 21 meter high cliff. Therefore, the mass is 3 kg and the height is 21 m.

    On Earth, the acceleration due to gravity is 9.81 m/s^2.

    m=3 kg

    h=21 m

    g=9.81 m/s^2

    Substitute these values into the formula.

    PE=3*9.81*21

    Multiply all the numbers together

    PE=63*9.81

    PE=618.03

    The potential energy is 618.03 kg m^2/s^2, or 618.03 Joules
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