A steel specimen \(2 \mathrm{~cm}^{2}\) are of cross-section elongates by \(0.1 \mathrm{~mm}\) over a gauge length of \(50 \mathrm{~mm}\) under an axial load of \(40 \mathrm{kN}\). Calculate the strain energy in the specimen. If its limit of proportionality is \(45 \mathrm{MPa}\), find the resilience.