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Three masses each of mass m are palced a...

Three masses each of mass m are palced at the vertices of an equilateral triangles ABC of side l as shown in figure. The force acting on a mass 2m placed at the centroid O of the triangle is

A

0

B

`(6Gm^2)/(a^2) hatj`

C

` -(6Gm^2)/(a^2) hatj`

D

`- (Gm^2)/(a^2)` hatj `

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The correct Answer is:
A
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