A ball of mass \(m\) is kept over another ball of mass \(M\) and released under gravity. Find
1) Max height reached by the ball of mass m after the system collides with the ground?
2) For what value of \(M/m\) height reached will be max?
3) For what value of \(m\); \(M\) will come to rest just after the collision?
Assume that all collisions are elastic.