In general form,what are the coordinates of the centre of mass of a rigid body?

  • A
    $\vec{R} = \frac{1}{M} \sum m_i \vec{r}_i$
  • B
    $\vec{R} = M \sum m_i \vec{r}_i$
  • C
    $\vec{R} = \frac{1}{M} \sum \frac{\vec{r}_i}{m_i}$
  • D
    $\vec{R} = \sum m_i \vec{r}_i$

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