The centre of mass of a system of two particles of masses $m_1$ and $m_2$ separated by a distance $d$ is:
- Aat a distance $\frac{m_2 d}{m_1 + m_2}$ from $m_1$
- Bat a distance $\frac{m_1 d}{m_1 + m_2}$ from $m_1$
- Cat a distance $\frac{m_2 d}{m_1 - m_2}$ from $m_1$
- Dat a distance $\frac{m_1 d}{m_1 - m_2}$ from $m_1$
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