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Question

# A man of mass 60kg and a boy of mass 30kg are standing together on frictionless ice surface. If they push each other apart man moves away with a speed of 0.4m/s relative to ice. After 5sec they will be away from each other at a distance of.

A
9.0m
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B
3.0m
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C
6.0m
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D
30,
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Solution

## The correct option is C 6.0mThe man and the boy move in opposite directions.Momentum of man= momentum of boy60×0.4=30×vor velocity of the boy v=0.8ms−1∴ Relative velocity =0.4+0.8=1.2ms−1∴ Distance between them in 5sec =1.2×5=6.0m.

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