B) For the truss assemblage shown in Figure 1 use the direct stiffness method to: i) Assemble the global stiffness matrix. ii) Solve for the nodal displacements. iii) Determine the stress in each element. Let A = 5x104 m and E = 200GPa for all bar elements. 3 4 3 m 60 5 m Figure 1 2 m 1 40 kN [7] [3] [9]