19. The plane truss shown in the figure has two elements and three nodes. Calculate the 4 x 4 ele¬

ment stiffness matrices. Show the row addresses clearly. Derive the final equations (after apply¬

ing boundary conditions) for the truss in the form of [K]{Q}={F}. What are nodal displacements and the element forces? Assume E = lO'^a, A = 10~4m2 L = 1 m F

= 14,142N.