Beam $AB$ supports two different shape of loading as shown in fig. below. The following equations have been derived from moment calculation.

$M=\frac{13}{12}wl.x-\frac{w}{2}{x}^2,0xl$

$M=\frac{13}{12}wlx-wlx+\frac{w{l}^2}{2}-\frac{4}{3}\frac{w}{2}(x-\frac{l}{2}{)}^3,lx2l$

If $l=3m$ and $w=5k\frac{N}{m},$ using the derivatives to find:

The shear force at distance $0,1,2,3,4,5$&$6m$

Draw the shear force diagram

$4w(k\frac{N}{m})$