Consider a beam supported by a pin support at one end $($A$)$ and a roller support at the

other end $($B$),$ as shown below.

$($i$)$ Draw a free$-$body diagram showing all external forces acting on the beam. $[2$ marks$]$

$($ii$)$ By considering the equilibrium of the beam, obtain the support reaction forces at ends A

and B$.[3$ marks$]$