A two-bar planar truss is supported by a spring of stiffness k at joint 1, as depicted i...

A two-bar planar truss is supported by a spring of stiffness k at joint 1, as depicted in Fig. P7.23. Each element has an axial rigidity AE. Calculate (a) the stiffness matrix for bars 1 and 2, and spring 3; (b) the system stiffness matrix; (c) the force–displacement equations. Given: L₂ = L,