A non-viscous liquid of constant density 1000 kg/m3 flows in a streamline motion along a tube of variable cross section. The tube is kept inclined in the vertical plane as shown in figure. The area of cross section of the tube at two points P and Q at heights of 2 meters and 5 meters are respectively 4x10-3 m2 and 8x10-3 m2. The velocity of the liquid at point P is 1 m/s. Then the work done per unit volume by the pressure as the fluid flows from point P to Q is
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