What is a statement of the principle of conservation of momentum?
1 )
A force is equal to the rate of change of momentum of the body upon which it acts.
2 )
In a perfectly elastic collision, the relative momentum of the bodies before impact is equal to their relative momentum after impact.
3 )
The momentum of a body is the product of the mass of the body and its velocity.
The total momentum of a system of interacting bodies remains constant, providing no resultant external force acts on the system.
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