the momentum of a system is constant if there is no net external force if there are no external forces
Added by Justin G.
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Momentum is defined as the product of an object's mass and its velocity. In a system, the total momentum is the sum of the momenta of all individual objects. Show more…
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The total linear momentum of a system is constant if the external force acting on a system is constant if all the objects in the system have the same mass because velocities can't change if there is no external force acting on a system
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