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Question

# Assertion :The rate of change of total momentum of a many particle system is proportional to the sum of the internal forces of the system. Reason: Intrnal forces can change the kinetic energy but not the momentum of the system

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

## The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionAssertionThe rate of change of total momentum of a many particle system is proportional to the sum of external forces. doesn't depend on sum of internal forces. example. people walking inside moving railway carriage do not constitute to the momentum of carriage whereas engine towing the carriage does)therefore assertion is incorrect.Reason. Internal forces can change the kinetic energy but not the momentum of the system.

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