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A rod of length l, mass M, cross section...

A rod of length `l`, mass `M`, cross section area `A` is placed on a rough horizonatal surface. A horizonatal force `F` is applied to rod as shwon in figure. The coefficient of fricition between rod and surface is `mu`, the Young, modulus of material of rod is `Y`. [Assume that fricition force is distributed uniformly on rod]

Teh elongation in rod if `F gt mu Mg` is

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