JEE Main Physics question

A ball hits the floor and rebounds after an inelastic collision. In this case, choose the correct statement(s).

(A)The momentum of the ball just after the collision is the same as that just before the collision
(B)The mechanical energy of the ball remains the same in the collision
(C)The total energy of the ball and the earth is conservedCorrect
(D)The total momentum of the ball and the earth is conservedCorrect

Answer: (C),(D)

Solution

In an inelastic collision, the ball's own momentum and kinetic energy both change (e.g. direction reverses and speed decreases), so (A) and (B) are false in general. However, treating the ball+earth as the full

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Question ID VK-158686