Find the Compression -2!

Classical Mechanics Level 4

A cubical block of volume \(V\) and density \(3\rho\) is placed inside a liquid of density \(\rho\) and attached to a spring of spring constant \(k\) as shown in the figure. Assuming ideal spring and pulley and spring is attached at \(A\) which is at \(\frac{R}{2}\) from center. The compression in the spring at equilibrium is:

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