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Extracted text: Use Virtual Work Method to answer the questions below considering the truss shown in the figure. Assume A = 1200 mm', E = 200 GPa and a = 12 x 10* / °C a. Axial force on member ED from the real structure in kN. Put (-) negative sign if it's under compression. b. Axial force on member AE from the virtual structure for the vertical displacement at joint A. c. Vertical displacement of joint A in mm due to external force only. Put negative sign if its downward. d. Vertical displacement of joint A in mm due to -100 °C change in temperature in members AE and ED. Don't add deflection due to external loads or fabrication error. Put negative sign if its downward. E 2.6 m to 3.80 kN 4.5 kN -2.6 m 2.6 m