Problem $2$: Using the method of Virtual Work, determine the total horizontal displacement of joint $B$ of the truss $($shown on the left$)$ due to the applied force and the fabrication error of $1$ cm long in member BC$.$ Also, fill in the blanks in the table provided. Each steel member has a cross$-$sectional area of $300m{m}^2($or $300**{10}^{-6}{m}^2).E=200$GPa.