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Question

A uniform rod of mass m1 and length L lies on the frictionless horizontal plane. A particle of mass m2 moving at a speed v0 perpendicular to the length of the rod strikes it at a distance L/3 from the centre and stops after the collision, Calculate the velocity of the centre of the rod .

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Solution

Centre of the mass of rod and particle of mass m2.
Linear momentum is conserved.
m2v0=m1vv=m2m1v0
= speed of centre of mass of rod.

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