phys. help

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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  1. Consider energy:
    finalKineticEnergy=InitialKE + PE
    1/2 m 4^2 = 1/2 m (1)^2 + mgh

    solve for height h.

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