2. For the shown structure, use the stochastic optimisation method of SPSA to find the lengths of members 2 and 3 which minimise the forces in links 4 and 5. Note the following constraints, 2.4m AB 3.5m and 2.8m AD 4.5m Solve the problem for the force angle taken as 90 deg, 120 deg and 180 deg. Note the angle made by link 2 with horizontal for every case and comment on the outcomes of the three runs. B E 2 3 KN 0 EB = 0.3 m BC = 2.44 m CD = 2.5 m (3 106