$(+5pts)$ Determine the shear stress $$ at the point shown, located $50$ mm above the neutral axis

NA $,$ in the center of the web shown. The internal shear force has been found to be $V=-42\mathrm{.}76kN$

and the moment of inertia of the section $I=155\mathrm{.}6{10}^{-6}{m}^4.$