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In a system comprising of two particles of mass 2 kg and 5 kg, the positions of the two particles at t=0 are `(4hati+3hatj)` and `(6hati-7hatj+7hatk)` respectively and the velocities are `(10hati-6hatk)` and `(3hati+6hatj)` respectively. Deduce the velocity of the centre of mass and the position of the centre or mass at t=0 and t=4 s

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