In a two-mass system m₁ and m₂, m₁ is moved toward the centre of mass by distance a. The distance m₂ must move in the opposite sense to keep the centre of mass fixed is:
Physics · Center of maas , Momentum and Collision · velocity and acceleration of center of mass,newton second law for system
In a two-mass system m₁ and m₂, m₁ is moved toward the centre of mass by distance a. The distance m₂ must move in the opposite sense to keep the centre of mass fixed is:

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