Problem $5(10$ pts$)$

Consider Fig. $4.$

Fig. $4$

$($a$)$ Calculate the reactions at A and $B.(2\mathrm{.}5pts)$

$($b$)$ Draw the diagrams for the internal normal forces $(N),$ shear forces $(V),$ and bending moments $(M)$ along the beam. $(7\mathrm{.}5$ pts$)$