rectangular rigid bar ABCDE is supported by two pairs of vertical links at B and D as shown in Figure $2.$ Loads of $75$ kN$,40$ kN and $25$ kN act at point A$,$ C and E$,$ respectively. Each of the vertical link joining B and F has rectangular cross$-$section of $75$ mm x $17\mathrm{.}5$ mm whilst that joining D and G has rectangular cross$-$section of $50$ mm x $17\mathrm{.}5$ mm$.$ Elastic modulus for links BF and DG are$110$ GPa and $80$ GPa, respectively. Details of connection of vertical links BF and DG are given in Figure $3.$Determine:$($a$)$vertical deflection of point B$($b$)$vertical deflection of point D$($c$)$ vertical deflection of point E