Problem $2(25$ points$)$:

The beam subjected to a uniformly distributed load of $300\frac{N}{m}$ is suspended by a cable$-$pulley system, as shown in Fig$\mathrm{.}2.$

$($a$)$ Determine the reactions at support A and the force in the cable. $(5\%)$

$($b$)$ Plot the moment distribution of the beam. $(10\%)$

$($c$)$ Plot the shear distribution of the beam. $(10\%)$