Consider the truss shown in $($Figure $1).$ Each bar is made of steel and has the cross$-$sectional area shown. Suppose that $\backslash ($ L$=6\backslash$mathrm$\{$ft$\}\backslash ).$ Take $\backslash ($ E$=29\backslash$left$(10^\{3\}\backslash$right$)\backslash$mathrm$\{$ksi$\}\backslash ).$

Figure

Part B

Determine the vertical displacement of joint $\backslash ($ A $\backslash )$ measured downward. Use the method o virtual work.

Express your answer using three significant figures. Enter positive value if the displacement is downward and negative value if the displacement is upward.

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