Two particles which are initially at rest - movetowards each other under the action of their internalattractionIf their speeds are v and 2v at any instant - then the speed of centre of mass of the system will be:[2010]

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Two particles which are initially at rest - movetowards each other under the action of their internalattractionIf their speeds are v and 2v at any instant - then the speed of centre of mass of the system will be:[2010]