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

Options

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

Answer

C

Explanation

In an inelastic collision, only momentum of the system may remain conserved. Some energy can be lost in the form of heat, sound, etc.