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A block of mass m is welded with a light...

A block of mass m is welded with a light spring of stiffness k. The spring is initially relaxed. When the wedge fitted moves with an acceleration a, as shown in figure. `8.60`, the block slides through a maximum distance `l` relative to the wedge. If the coefficient of kinetic friction between the block and the wedges is `mu`, find the maximum deformation `l` of the spirng by using work-energy theorem.

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