The position vector of a particle of mass 3 kg is r = 3 i + 3t j + 2t2j and that of a particle of A mass 5 kg isr2 = 3 i - 2t2i - 6t 3, where t is in s and r is in m. Determine the position of the centre of mass of the system and the velocity of the centre of mass at t = 2 s.
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