A gas is enclosed by a movable piston in a cylinder. The gas expands from an initial volume of \(3 \mathrm{~m}^{3}\) to a final volume of \(5 \mathrm{~m}^{3}\) as a result of \(210 \mathrm{~kJ}\) of work done on the system by an external source. The pressure of the system remains constant at \(560 \mathrm{kPa}\). Estimate the net work done by the system.