QUESTION $1$

For the rectangular cross section shown in Figure Q$1,$

$1\mathrm{.}1$ Calculate the shear stress at A$-$A$,$ B$-$B$,$ C$-$C$,$ D$-$D$,$ E$-$E$,$ F$-$F and the neutral axis; and

$1\mathrm{.}2$ Plot to a suitable scale the shear stress distribution over the depth of the section showing the magnitudes of shear stresses at A$-$A$,$ B$-$B$,$ C$-$C$,$ D$-$D$,$ E$-$E$,$ F$-$F and the neutral axis.

Take the shear force as $90$ kN $.$

Figure Q$1($All the dimensions are in mm $)$