Four particles, each of mass 1 kg and equidistant from each other, move along a circle of radius 1 m under the action of their mutual gravitational attraction. The speed of each particle is :
(1) $\sqrt{G(1+2\sqrt2)}$
(2) ${1\over2}\sqrt{G(1+2\sqrt2)}$
(3) $\sqrt G$
(4) $\sqrt{2\sqrt2G}$
(1) $\sqrt{G(1+2\sqrt2)}$
(2) ${1\over2}\sqrt{G(1+2\sqrt2)}$
(3) $\sqrt G$
(4) $\sqrt{2\sqrt2G}$