PROBLEM $2\mathrm{.}23$

Members $AB$ and $BC$ are made of steel $(E=29M)$

with cross sectional areas of $0\mathrm{.}80i{n}_2$ and $0\mathrm{.}64i{n}_2,$

respectively. For the loading shown, determine the

elongation of $($a$)$ member $AB,(b)$ member $BC.$