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| Momentum Conservation and Motion of Centre of Mass |
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As we know, the linear momentum of a
particle is defined as  , where m is the
mass and  is the
velocity, the momentum of an N particle system is the vector sum of the momenta of the N particles. |
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| If the external forces acting on the system add up to zero, the centre of mass moves with constant velocity. |
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| Hence, the principle of conservation of linear momentum states that the linear momentum of a system remains constant if the external forces acting on the system add up to zero. |
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Motion of Particles and Rigid Body
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