The bending moment diagram for a simply supported beam is piecewise linear as shown in the figure. The bending moment $M(\mathrm{x})$ at $\mathrm{x}=0.5 \mathrm{~m}$ is $5$ $\mathrm{Nm}$. The beam has a rectangular cross-section with an area of $1 \mathrm{~m}^{2}$.
The absolute value of the maximum shear stress on the cross-section at $x=0.75 \mathrm{~m}$ is $\_\_\_\_$ $\mathrm{N} / \mathrm{m}^{2}$ (in integer).
