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21 June, 18:38

If a 40 kg rock fell from a cliff and had a speed of 31.3 m/s when it hit the ground, what is it's kinetic energy?

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  1. 21 June, 21:27
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    Kinetic energy = (1/2) (mass) (speed) ²

    It doesn't matter what direction the object is moving, what happened to set it in motion, or what route it's following.

    Kinetic energy = (1/2) (40 kg) (31.3 m/s) ²

    Kinetic energy = (20 kg) (979.69 m²/s²)

    Kinetic energy = (20 x 979.69) (kg-m²/s²)

    Kinetic energy = 19,594 joules
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