Statement I Internal forces can change the kinetic energy but not the momentum of the system.
Statement II The rate of change of total momentum of a many particle system is proportional to the sum of the internal forces of the system.
In the light of the above statements, choose the most appropriate answer from the options given below
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Statement I is correct but Statement II is incorrect, The total momentum of a many particle system can change only when some external force is applied on the system. So, rate of change of momentum is proportional to external force acting on the system. The total momentum of whole system remain constant when no external force is acted upon it (according to law of conservative of momentum).
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