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31 July, 19:17

a 75 kilogram boy initally at rest skis down the slope as shown assuming no frictional loss what will be his kinetic energy at the bottom of the slope

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  1. 31 July, 22:19
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    The kinetic energy at bottom, K. E = 73500 J

    Explanation:

    Given data,

    The mass of the boy, m = 75 kg

    Let the height of the hill be, h = 100 m

    The P. E is maximum at the top of the hill. Since the boy is at rest at the top of the hill, his K. E is zero.

    When he reaches the bottom, his K. E is maximum and P. E is zero.

    According to the law of conservation of energy, K. E at the bottom is equal to the P. E at top.

    P. E = mgh

    = 75 x 9.8 x 100

    = 73500 J

    Hence, the kinetic energy at bottom, K. E = 73500 J
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