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Q.

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

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a

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

b

Linear momentum of ball is conserved

c

Kinetic energy of ball is conserved

d

Linear momentum of system (ball + rod) is conserved

answer is A, C, D.

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Detailed Solution

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