Two identical cylindrical vessels with their bases at same level, each contains a liquid of density $d$ . The height of the liquid in one vessel is $ h_1$ and that in the other vessel is $h_2$ . The area of either base is $A$ . The work done by gravity in equalizing the levels when the two vessels are connected is
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Work done = initial potential energy -final potential energy
or $W{\text{ }} = {\text{ }}Adg\,\left[ {\frac{{h_1^2 + h_2^2}}{2} - {{\left( {\frac{{{h_1} + {h_2}}}{2}} \right)}^2}} \right]\, = \,\frac{{Adg}}{4}{({h_1} - {h_2})^2}$
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