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Math Help - Past Year Exam Question

  1. #1
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    Past Year Exam Question

    Hi guys,

    Anyone know how to solve this?

    Two particles A and B, of masses m and 4m respectively, lie on a smooth horizontal surface. Their position vectors with respect to the origin in Cartesian coordinates, are -3i and i , respectively.
    a) Find the position vector of their centre of mass.

    Thanks,
    WeiJing
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  2. #2
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    Re: Past Year Exam Question

    \bar{x} = \frac{\sum m_i x_i}{\sum m_i}
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