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## Homework Statement

Given

mass = 90kg

distance = 20m above sea level.

Find his potential and kinetic energy at the top of the cliff, at what point in his leap is his kinetic energy 450 J and at what speed does he enter the water?

## Homework Equations

## The Attempt at a Solution

I can solve for PE and KE at the top of the cliff. Have trouble calculating when his KE = 450 J and his velocity entering the water.