Fig. P$7\mathrm{.}46$

$7\mathrm{.}47$ and $7\mathrm{.}48$ Assuming the upward reaction of the ground on beam $AB$ to be uniformly distributed, $(a)$ draw the shear and bending$-$moment diagrams, $(b)$ determine the maximum absolute values of the shear and bending moment.

$|-2m+4L4$mlongrightarrow$|$