Difficult
Three particles,each of mass $m$,are placed at the vertices of an equilateral triangle $ABC$ of side length $l$. What is the moment of inertia of the system about the axis $AX$ in the plane of $ABC$,as shown in the figure?
- A$\frac{3}{4}ml^2$
- B$2ml^2$
- C$\frac{5}{4}ml^2$
- D$\frac{3}{2}ml^2$
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