For the truss structure shown: 1) set-up element stiffness matrices for each element, 2) assemble global stiffness matrix equations, 3) apply boundary conditions, 4) solve for unknown displacements, 5) solve for reactions and stresses in each element. Given are: E = 10Msi, v = 0.3, A = A3 = 0.5in and A=A4 = 0.25in. 500lbf 30in 5 m N 22 12in 12in 12in