JEE Main Physics question

A body is dropped and observed to bounce to a height greater than the dropping height. Then

(A)The collision is elastic
(B)There is an additional source of energy during collisionCorrect
(C)It is not possible
(D)This type of phenomenon does not occur in nature

Answer: (B)

Solution

In any passive, source-free collision (with a stationary floor), energy can at best be conserved (elastic collision, bounce to the same height) but never increased.

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Question ID VK-158636