Rotating sheet

Consider a rectangular sheet of metal with width W=2 mW=2~\mbox{m} and length L=5 mL=5~\mbox{m}. The sheet is in the x-y plane, with the origin right in the geometric middle of the sheet. The x-axis is parallel to the short edge, while the y-axis is parallel to the long edge. The moment of inertia about the z-axis is Iz=10 kgm2I_z=10~\mbox{kg}\cdot\mbox{m}^2 and the moment of inertia about an axis that passes diagonally through the sheet (i.e. corner to corner) in the xy plane is I=5 kgm2I=5~\mbox{kg}\cdot\mbox{m}^2. What is the moment of inertia about the y-axis in kgm2\mbox{kg}\cdot\mbox{m}^2?

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