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A uniform rod AB of mass 3m and length 2...

A uniform rod AB of mass 3m and length 2l is lying at rest on a smooth horizontal table with a smooth vertical axis through the end A. A particle of mass 2m moves with speed 2u across the table and strikes the rod at its mid-point C if the impact is perfectly elastic. Find the speed of the particle after impact if
(a). It strikes rod normally,
(b). Its path before impact was inclinded at `60^(@)` to AC.

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