Answer to Question #65591 in Mechanics | Relativity for sartaj

Question #65591
The position vector of two particles of mass 4.0 kg and 2.0 kg are, respectively, kjir ˆ2ˆˆ3 2 1 t tt + += r and ( ) k jir ˆ 4ˆ1ˆ3 2 2 t t + −+= r where t is in seconds and the position in metres. Determine the position vector of the centre of mass of the system, the velocity of the cm and the net force acting on the system.
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