In a two-bar plane truss, its support at joint 1 settles vertically by an amount of u _...

In a two-bar plane truss, its support at joint 1 settles vertically by an amount of u _ 15 mm downward when loaded by a horizontal concentrated load P (Fig. P7.25). Calculate (a) the global stiffness matrix of each element; (b) the system stiffness matrix; (c) the nodal displacements; (d) the support reactions. Given: