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    jasmens01's Avatar
    jasmens01 Posts: 1, Reputation: 1
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    #1

    Jan 9, 2012, 09:38 AM
    The energy
    A 34.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 23.00 m. When she is partway down the slide, at a height h2 of 13.00 m, she is moving at a speed of 7.50 m/s. Calculate the mechanical energy lost due to friction (as heat, etc.).
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jan 9, 2012, 09:44 AM
    Conservation of energy says:

    PE + KE + energy lost to friction = 0.

    PE is equal to mgh and is a negative number as the child moves downhill. The change in KE is 1/2mv^2. So now you have everything you need to calculate the energy lost to friction. Post back with your answer and we'll check it for you.
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