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Two identical blocks A and B of mass M e...

Two identical blocks A and B of mass M each are kept on each other on a smooth horizontal plane. There exists friction between A and B. A bullet of mass m hits the the lower block with a horizontal velocity v and goes embedded into it. Find the work done by friction between A and B.

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The correct Answer is:
`(1)/(2)(Mm^(2)v^(2))/((m+2M)^(2))`
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