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[" Whe centre of mass of three particles of masses "],[1kg,2kg" and "3kg" lies at the point "(3m,3m,],[3m)" where should a fourth particle of mass "4],[kg" be positioned so that centre of mass of the "],[" four particle system lies at "(1m,1m,1m)?],[qquad [" [Ans."(-2m,-2m,-2m)]]]

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