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A 42 kg girl walks along a stationary un...

`A 42 kg` girl walks along a stationary uniform beam of mass `21 kg.` She walks with a speed of `0.75 m//s.` What is the speed of the center of mass of the system of girl plus beam ?

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The correct Answer is:
`[0.5m//s]`
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PHYSICS GALAXY - ASHISH ARORA-LINEAR MOMENTUM & ITS CONSERVATION-unsolved
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