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A cubical block 'A' of mass m(0)(=a^(3)r...

A cubical block 'A' of mass `m_(0)(=a^(3)rho=3 kg)` of edge 'a' and density `rho` floats in a liquid of density `3rho`. The lower surface of the cube just touches the free end of massless spring of spring of spring constant `k(=a^(2)rho g)` fixed at the bottom of the vessel. Another block 'B' of mass 'm' is lept over block 'A', so that is completely immersed in liquid without wetting the block 'B'. Then find the value of m in kg.

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