Consider the truss shown in $($Figure $1).$ Assume the members are pin connected at their end points. Take $A=5\mathrm{.}5$ in$^2$ and $E=29({10}^3)ksi$ for each member.

$1*={\displaystyle \underset{?}{\overset{?}{}}}N(\frac{\text{d}\text{e}\text{l}\text{N}}{\text{d}\text{e}\text{l}\text{P}})\frac{AE}{L}$

$1*={\displaystyle \underset{?}{\overset{?}{}}}\frac{\text{N}\text{A}\text{E}}{nL}$

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Here we learn how to determine the correct equation of the method of virtual work for the displacement in trusses.

Part B

Figure

$1$ of $1$

Determine the vertical displacement of joint A measured downward. Use the method of virtual work.

Express your answer in inches to three significant figures. Enter a positive value if the displacement is downward and a negative value if the displacement is upward.

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${}_{Av}=$in

PLEASE ANSWER PART B IN INCHES