1. In the figure, aluminum [E = 70 GPa] links (1) and (2) support rigid beam ABC. Link (1) has a cross-sectional area of 300 mm² and link (2) has a cross-sectional area of 450 mm². For an applied load of P = 55 kN, determine the rigid beam deflection vs at point B. (30 points) 2500 mm ①) 4000 mm C 1400 mm 800 mm