Posted by **Megan** on Friday, February 11, 2011 at 3:26pm.

A 30.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 18.00 m. When she is partway down the slide, at a height h2 of 9.00 m, she is moving at a speed of 9.30 m/s. Calculate the mechanical energy lost due to friction (as heat, etc.).

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