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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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a