Center Of Mass

As shown in the figure, an iron block \(A\) of volume \(0.25 \mathrm{~m}^3\) is attached to a spring \(S\) of unstretched length 1.0 m and hanging to the ceiling of a roof. The spring gets stretched by 0.2 m . This block is removed and another block \(B\) of iron of volume \(0.75 \mathrm{~m}^3\) is now attached to the same spring and kept on a frictionless incline plane of \(30^{\circ}\) inclination. The distance of the block from the top along the incline at equilibrium is