The center post B of the assembly has an original length of 124.7 mm, whereas posts A and C have a length of 125 mm. If the caps on the top and bottom can be considered rigid, determine the average normal stress in each post. The posts are made of aluminum and have a cross-sectional area of 400 mm². E_al = 70 GPa.

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A 100 mm 100 mm B 800 kN/m C 125 mm 11800 800 kN/m