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Question
A particle of mass m is moving at speed v perpendicular to a rod of length d and mass M = 6m which pivots around a frictionless axle running through its centre. It strikes and sticks to the end of the rod. The moment of inertia of the rod about its centre is 
Then the angular speed of the system just after the collision is
- 2v/3d
- 2v/d
- v/d
- 3v/2d
The correct answer is: 2v/3d
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