A small block A of mass m 2 kg is placed on a plank B...

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A small block A of mass m 2 kg is placed on a plank B of mass M 8 kg which is placed on a smooth horizontal surface The distance between the left end of the plank and its vertical wall is l 4 m The coefficient of friction between the block and the plank is 0 5 and collision between the block and the vertical wall of plank is perfectly elastic An initial velocity Vo is imparted to the block so that the block stops on the plank at its left enc after collision with the vertical wall Find the time in sec for which the block has moved relative to the plank Take g 10 m s A Vo M B

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