The following table contains load-extension data from a tensile test on a cylindrical specimen with gauge length 9mm and gauge diameter 5mm. Load [kN] Load-extension Data 06.55 10.10 16.05 18.70 20.80 20.10 19.50 Extension [mm] 00.025 0.039 0.065 0.165 0.681 0.900 1.000 By plotting a stress-strain curve (or otherwise), determine the plastic strain at failure of the material