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A man standing on the edge of a roof of ...

A man standing on the edge of a roof of a 20 m tall building projects a ball of mass 100 g vertically up with a speed of `10 ms^(-1)` and simultaneously throws another ball of same mass vertically down with the same speed. Find the kinetic energy of each ball when they reach the ground. `(g=10 ms^(-2))`

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50 J, 50 J
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