Question $2.(20$ marks$)$

Using virtual force method calculate the horizontal deflection of joint D of the truss shown Figure Q$2.$ Take $E=200k\frac{N}{m}{m}^2$ and member areas, $A=1000m{m}^2$ for all members except $AE$ and $BD$ where $A=1000\sqrt[\phantom{2}]{2}m{m}^2.$

$($z$0$ marks$)$