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A particle of mass m is moving yz-plane ...

A particle of mass m is moving yz-plane with a uniform velocity v with its trajectory running parallel to +ve y-axis and intersecting z-axis at z = a. The change in its angular momentum about the origin as it bounces elastically from a wall at y = constant is

A

mva `bar(i)`

B

2 mva `bar(j)`

C

`-mva bar(j)`

D

`-2amv bar(i)`

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The correct Answer is:
B
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