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Work-Energy Theorem

In the given ...

Question

In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)

A

Linear momentum of system (ball + rod) is not conserved

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B

Angular momentum of system (ball + rod) about hinged point A is conserved

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C

Kinetic energy of ball is conserved

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D

Linear momentum of ball is conserved

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Solution

The correct options are
A
Linear momentum of system (ball + rod) is not conserved

B
Angular momentum of system (ball + rod) about hinged point A is conserved

Angular momentum of system is conserved about A as torque about A is zero. Linear momentum is not conserved as there is an impulse applied at A.

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