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16 March, 09:18

A car accelerates from 20mi/hr to 60mi/hr. How many times greater is the car's kinetic energy at the higher speed compared to the kinetic energy at the slower speed

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  1. 16 March, 11:19
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    9 times

    Explanation:

    Kinetic energy is:

    KE = ½ mv²

    When we triple the velocity, the kinetic energy increases by a factor of 9.

    9KE = ½ m (3v) ²
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