Question: A ball, initially rolling at 2.0m/s, rolls down a frictionless hill in 6.0s. At the bottom of the hill, the ball has a final velocity

A ball, initially rolling at 2.0m/s, rolls down a frictionless hill in 6.0s. At the bottom of the hill, the ball has a final velocity of 7.0 m/s. It then rolls on a flat, frictionless surface and falls off of an 80m cliff into a lake. Determine The height of the hill and The speed of impact with the lake.

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