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Question

A body of mass 1 kg makes an elastic collision with another body at rest and continues to move in the original direction after collision with a velocity equal to 14 of its original velocity. The mass of the second body is


A

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B

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C

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D

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Solution

The correct option is B


1×V+m2×0=1×V4+m2V2m2v2=3V4 For elastic collision,V2V1=u1u2V2V4=V0 V2=5V4 Substituting in m2v2=3v4 m2×5v4=3v4m2=35kg

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