Posted by **Aulivia** on Wednesday, March 5, 2008 at 5:35pm.

A 30-kg child coast down a hill on a 20-kg sled. She pushes off from the top of the hill with a velocity of 1 m/s. At the bottom of the hill, she is moving 4 m/s. If there is no heat generated when she slides down, how high is this hill?

thank u

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