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Figure shows a small block of 'm' kept a...

Figure shows a small block of 'm' kept at the left end of larger block of mass 'M' and length 'l'. The system can slide on a horizontal road. The system is started towards right with an initial velocity ‘u’ The friction coefficient between the road and bigger block is `'mu' `and that between the block is . `(mu)/(2).` The time elapsed before the smaller block separates from bigger block is `sqrt ((n Ml)/((M + m ) mu g ))` where n is

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