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11 July, 00:12

If a car increases its speed from 20 mph to 60 mph, by what factor does the kinetic energy of the car increase

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  1. 11 July, 00:24
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    Mass is constant.

    Therefore, KE2/KE1 = v2^2/v1^2 = 60^2/30^2 = 4.

    Answer is by a factor of 4.
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