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9 January, 15:10

An object moving at 10. km/hr has a kinetic energy of 10. J. what is the kinetic energy of the same object if it is moving at 20. km/hr

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  1. 9 January, 16:03
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    Kinetic energy is related to velocity by:

    KE = (1/2) mv^2

    solve for mass m

    10 = (1/2) m (10) ^2

    10 = (1/2) m (100)

    10 = 50m

    10/50 = m

    1/5 = m

    at 20 km/hr

    KE = (1/2) (1/5) (20) ^2

    KE = (1/10) (400)

    KE = 40 J
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