The cross$-$section shown below is subject to a negative internal bending moment M $=105$ kNm applied about the local z$-$axis of the section. The top flange has a width b $=420$ mm and a thickness t $=20$ mm$,$ the vertical webs each have a thickness a $=20$ mm$,$ and the total section has a height h $=120$ mm$.$ In your working express your centroidal location to the nearest tenth of a millimetre and express the second moment of area for the cross$-$section to the nearest millimetre. The cross$-$section shown below is subject to a negative internal bending moment M$=105$ kNm applied about the local z$-$axis of the section. The top flange has a width b$=420$ mm and a thickness t$=20$ mm$,$ the vertical webs each have a thickness a $=20$ mm$,$ and the total section has a height h$=120$ mm$.$In your working express your centroidal location to the nearest tenth of a millimetre and express the second moment of area for the cross$-$section to the nearest millimetre.Determine the maximum tensile normal stress in the cross$-$section due to the internal moment. Report your answer in units of MPa with one decimal place of accuracy.Determine the maximum compressive normal stress in the cross$-$section due to the internal moment. Report your answer in units of MPa with one deimal place of accuracy.