8 E 1 L D 8. The assembly consists of two posts AB and CD each made from material 1 having a modulus of elasticity of E1 and a cross-sectional area A, and a central post EF made from material 2 having a modulus of elasticity E2 and a cross-sectional area A. If posts AB and CD are to be replaced by those having a material 2, determine the required cross-sectional area of these new posts so that both assemblies deform the same amount when loaded. (#4-65, p 154)