First slide

Types of collision

Question

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

Moderate

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 momentum of the ball and the earth is conserved
D

the total energy of the ball and the earth is conserved

Solution

Here we consider the ball and earth as one system. Since no external forces act during collision (the gravitational force is an internal force only), the total momentum is conserved.

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