Two particles of equal mass go round a circle of radius $R$ under the action of their mutual gravitational attraction. The speed of each particle is

  • A

    $v = \frac{1}{{2R}}\,\sqrt {\frac{1}{{Gm}}} $

  • B

    $v = \sqrt {\frac{{Gm}}{{2R}}} $

  • C

    $v = \frac{1}{2}\,\sqrt {\frac{{Gm}}{R}} $

  • D

    $v = \sqrt {\frac{{4Gm}}{{R}}} $

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