The cross$-$section shown below is subject to a negative internal bending moment

$M=145kNm$ 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 $a=20mm,$ and the total section has a height $h=110mm.$

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 decimal place

of accuracy.