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Question

A particle of mass m moving with speed v towards east strikes another particle of same mass moving with same speed v towards the north. After striking, the two particle fuse together. Determine the speed this new particle of mass 2 m will move in north-east direction?

A
v
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B
v2
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C
v2
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D
v2
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Solution

The correct option is C v2

Moment before and after collision is same.
2mu=mvˆ1+mvˆj2u=vˆ1+vˆj|v=|12v2+v2=v2

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