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Three point masses m,m and 2m are placed...

Three point masses m,m and 2m are placed on the vertex of an equilateral triangle of side 'a' Another point mass 'm' is placed at the centroid of the triangle as shown in the figure. If the magnitude of net force on the point mass placed at centroid is `(KGm^2)/(a^2)` then find the value of K (G= universal gravitational constant )

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