Mercury of density `rho_(m)` is poured into cylinderical communicating vessels of cross-sectional area 2A and A respectively. A solid iron cube of volume `V_(0)` and relative density 2 is dropped into the broad vessel, and as a result the level of the mercury in it rises. Then, water is poured into the broader vessel until the mercury reaches the previous level in it. Find the height of water column if it does not submerge the block.
