20 KN A 50 mm 400 mm (a) B The bar ABC in Fig. (a) consists of two cylindrical segments. The material of the bar has the stress-strain diagram shown in Fig. (b). Determine the approximate elongation of the bar caused by the 20-kN axial load. 25 mm 300 mm MIC -20 kN Stress (MPa) 50 40 30 20 10 0.000 0.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 Strain (b) FIG.P2.3