Q#$3.$ The Figure below shows an experimental set up designed to transfer a load of $60kN$ from a

hydraulic jack to ground through a beam and a truss. Beam is supported on two rollers D and E

which are simply supported on the truss. The truss transfers load to ground through supports A

and B which are a roller and a pin respectively. Neglect weight of truss and beam. Assume all

loads are transferred ideally to joints. Determine:

a$)$ The beam reactions at $D$ and $E.$

b$)$ The support reactions at A and $B.$

c$)$ forces in members $AC,DC$ and $DE.$

$($Use method of joints or method of sections$).$