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Question

A particle of mass m moving eastward with a speed v collides with another particle of the same mass moving northward with the same speed v. The two particles coalesce on collision. The new particle of mass 2m will move in the north-easterly direction with a velocity


A

v/2

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B

2v

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C

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D

v

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Solution

The correct option is C


Initial momentum of the system

Pi=mv^i+mv^j

|Pi| = 2mv

Final momentum of the system = 2mV

By the law of conservation of momentum

2mv=2mVV=v2


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