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    jefferydd's Avatar
    jefferydd Posts: 1, Reputation: 1
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    #1

    Feb 1, 2012, 08:03 PM
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    A boy starts at the bottom of a hill and runs to the top, another boy stats at the bottom and walks winding his way up and gradually makes it to the top. How expends more energy and why
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    Aurora2000 Posts: 111, Reputation: 16
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    #2

    Feb 2, 2012, 02:14 AM
    If no friction are considered, and they have the same mass, then their energy expense are the same: indeed let be h the height of the hill, they both must use mgh energy (g=9.81 m/s^2).
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