$3\mathrm{.}3-2.$ Find the end$-$actions for member AB of the beam shown in $($a$)$ if$,$ instead of the uniform load, the beam is subjected to a vertical, downward, concentrated force P at the midpoint. The beam has constant flexural rigidity EI$,$ and the end$-$actions are to be taken in the following order: $(1)$ the shearing force at the lefthand end, $(2)$ the moment at the left$-$hand end, and $(3)$ the shearing force at the right$-$hand end.