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A man standing on the edge of the terrac...

A man standing on the edge of the terrace of a high rise building throws a stone, vertically up with at speed of `20 m//s`. Two seconds later, an identical stone is thrown vertically downwards with the same speed of `20 m`,. Then

A

the relative velocity between the two stones remains constant till one hits the ground

B

both will have the ame kinetic energy when they hit the ground

C

the time interval between their hitting the ground is 2 seconds

D

if the collisions on the ground are perfectlyl elastic bothh will rise to the same height above the ground

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The correct Answer is:
A, B, C, D
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