A ball hits a floor and rebounds after an inelastic collision. In this case

Options

A. the total energy of the ball and the earth remains the same
B. the total momentum of the ball and the earth is conserved
C. the momentum of the ball just after collision is same as that just before the collision
D. the mechanical energy of the ball remains the same during the collision.

Answer

A, B

Explanation

A the collision is inelastic, body loses some energy, so that KE of ball does not remain the same. However, total energy and total momentum ball and earth remain the same. Choice `(a)` and `(b)` are correct.