The cross$-$section shown below is subject to a negative internal bending moment $M=125kNm$ applied about the local $z-$axis of the

section. The top flange has a width $b=360mm$ and a thickness $t=20mm,$ the vertical webs each have a thickness $a=10mm,$

and the total section has a height $h=130mm.$

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.

$h$

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 decimal place of accuracy.