Underline the correct alternative: The rate of change of total momentum of a many-particle system is proportional to the external
Underline the correct alternative:
The rate of change of total momentum of a many-particle system is proportional to the external force/sum of the internal forces on the system.
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External force
Internal forces, irrespective of their direction, cannot produce any change in the total momentum of a body. Hence, the total momentum of a many-particle system is proportional to the external forces acting on the system.
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