Problem $3(Ch8)$

Determine the vertical displacement of joint A$.$ Assume the members are pin connected at their end points. Take $A=3i{n}^2$ and $E=29({10}^3)$ ksi for each member. Use either virtual work or Castigliano's Theorem. $($Hint: $288\mathrm{.}75$ should be your total members summation$)$