2. For the element shown in Fig, 1, calculate the element stiffness matrix. The coordinates are in mm. Take E = 70 GPa, v = 0.25, and t = 5 mm. If the nodal displacements (in mm) are U = = 0; v = 0.01; u2=0.005; v = 0; uz = 0; v3 = 0.01 compute the element stresses (assuming plane stress conditions). 1 a L 2 Po P = Po[ Figure 2: Triangular element with quadratically varying traction.