$2.$ Referring to the Fig. $2,$ the beam has a cross$-$section as shown in the figure. Draw the shear and bending$-$moment diagrams for a simply supported beam $\backslash ($ A B $\backslash )$ of span $\backslash ($ L $\backslash )$ subjected to a single concentrated load $\backslash ($ P $\backslash )$ at its midpoint $\backslash ($ C $\backslash ).$ Comment about the critical section, draw the bending stress distribution and shear stress distribution within this critical section. Locate the critical point within the critical section plane.

Fig. $2$

Take $\backslash (\backslash$mathrm$\{$L$\}=2\backslash$mathrm$\{$~m$\},\backslash$mathrm$\{$P$\}=100\backslash$mathrm$\{$kN$\}\backslash )$