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49. Three point masses m1, m2, m3 are located at the vertices of an equilateral triangle of length ‘a’ . The moment of inertia of the system about an axis along the altitude of the triangle passing through m1 is

(a) (m₂+m₃)a⁴/4

(b) (m ₁+m₂+m ₃)a2

(c) (m₁+m₂)a²/2

(d) (m₂+m₃)a²

Ans. a

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