Two cylindrical vessels of equal cross sectional area of \( 2 \, \text{m}^{2} \) contain water up to heights \( 10 \, \text{m} \) and \( 6 \, \text{m} \), respectively. If the vessels are connected at their bottom then the work done by the force of gravity is:
(Density of water is \( 10^{3} \, \text{kg/m}^{3} \) and \( g = 10 \, \text{m/s}^{2} \) )
