Four identical spheres each of mass $m$ are placed at the corners of square of side $2\,metre$. Taking the point of intersection of the diagonals as the origin, the co-ordinates of the centre of mass are

  • A

    $(0, 0)$

  • B

    $(1, 1)$

  • C

    $(-1, 1)$

  • D

    $(1, -1)$

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  • [AIIMS 2009]