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14 July, 01:59

A 1500-kg car doubles its speed from 50 km/h to 100 km/h. By how many times does the kinetic energy from the car's forward motion increase?

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  1. 14 July, 02:03
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    The kinetic energy increases 4 times

    Explanation:

    Given,

    The mass of the car, m = 1500 Kg

    The speed of the car doubles from 50 Km/h to 100 Km/h

    The kinetic energy at 50 Km/h

    K. E = ½mv²

    = ½ x 1500 x 50²

    = 1875000 J

    The kinetic energy of the car at 100 Km/h

    K. E = ½mv²

    = ½ x 1500 x 100²

    = 7500000 J

    Hence, the final K. E is 4 times the initial K. E
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