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21 June, 22:00

Suppose a moving car has 750 J of KE. If the car's speed doubles, how much KE will it have?

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  1. 22 June, 00:07
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    If the speed is doubled then the kinetic energy will be 3000J.

    Explanation:

    The kinetic energy is calculated by,

    KE = (1/2) (M x V x V)

    750 = (1/2) (M x V x V)

    750 (2) = M x V x V

    1500 = M x V x V

    If the speed is doubled then the kinetic energy will be

    KE = (1/2) (M x 2V x 2V)

    KE = (1/2) (4) (M x V x V)

    The value of (M x V x V) = 1500

    So,

    KE = (1/2) (4) (1500)

    KE = 3000J

    If the speed is doubled then the Kinetic energy will be 3000J
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