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7 June, 23:22

A 4kg rock isn't rolling 10m/s. Find it's kinetic energy.

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  1. 8 June, 02:00
    0
    Kinetic energy = (1/2) (mass) (speed) ²

    The rock's kinetic energy is not

    (1/2) (4 kg) (10 m/s) ²

    = (1/2) (4 kg) (100 m²/s²)

    = 200 Joules.

    It may be more, or it may be less. The only thing

    we can be sure of is that it is not 200 Joules.
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