A ball 'A' of mass 'm' falls under gravity from a height 'h' and strikes another ball 'B' of mass 'm' which supported at rest on a spring of stiffness 'k' . Assume perfectly elastic impact . Immediately after the impact,
1
Velocity of ball A is ( 1/2.√2gh )
2
Velocity of ball A is zero
3
Velocity of both balls are( 1/2 .√ 2.gh )
4
None of the above .