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A railroad flatcar of mass M can roll wi...

A railroad flatcar of mass `M` can roll without friction along a straight horizontal track. Initially, a man of mass 'm' is standing on the car, which is at rest. What is the velocity of the car if man runs to the left so that his speed relative to the car is `v_(rel)`.

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The correct Answer is:
`(mv_("rel"))/(M + m)`
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NN GHOSH-LAWS OF MOTION, FREE BODY DIAGRAM-Exercise (A)
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