A man standing on the edge of the roof of a 20 m tall building projects a ball of mass 200 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)).

A man standing on the edge of the roof of a 20 m tall building project

1.	A man standing on the edge of the roof of a 20 m tall building projects a ball of mass 200 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)).
Answer» ANSWER :50 J, 50 J