Three equal masses of \( 1 \mathrm{~kg} \) each are placed at the vertices of an equilateral tri...

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Three equal masses of \( 1 \mathrm{~kg} \) each are placed at the vertices of an equilateral triangle \( \mathrm{PQR} \) and a mass of \( 2 \mathrm{~kg} \) is placed at the centroid \( O \) of the triangle which is at a distance of \( \sqrt{2} \mathrm{~m} \) from each of the vertices of the triangle. The force, in newton, acting on the mass of \( 2 \mathrm{~kg} \) is :-
(1) 2
(2) \( \sqrt{2} \)
(3) 1
(4) zero
\( \mathrm{P} \)
W
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