The composite shaft, consisting of aluminum, copper, and steel sections, is subjected to the loading shown

The composite shaft, consisting of aluminum, copper, and steel sections, is subjected to the loading shown. The cross-sectional areas of sections AB, BC   , and CD are AAB = 0.08 in2 , ABC = 0.14 in2 , and ACD= 0.07 in2 , respectively. The modulus of elasticity for each section are shown in the figure. Neglect the size of the collars at B and C.

Determine the displacement of B with respect to C of the composite shaft. Aluminum Copper Steel Eal 1000) ksi ECU-18(10) ksi Est -29(103) ksi 3.50 kip 1.75 kip 1.50 kip 2.00 kip 50 kip 1.75 kip 18 in 12 in 16 in