Solve this:
A cubical block of wood of edge 3 cm floats in water. The lower surface of the cube just touches the free end of a vertical springs fixed at the bottom of the pot. Find the maximum weight that can be put in the block without wetting it. Density of wood = 800 kg m^-3 and spring constant of the spring = 50 N m^-1 . Take g = ms^-2.