Assertion A man standing on a completely frictionless surface can propel himself by whistling Reason...........

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Assertion: A man standing on a completely frictionless surface can propel himself by whistling.

Reason: If no external force acts on a system, its momentum can not change.

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

A is true but R is false

R is true but A is false

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Explanation:

Both A and R are true but R is not the correct explanation of A.
The law of conservation of linear momentum may be stated as when no net external force acts on a system consisting of several particles, the total linear momentum of the system is conserved, the total linear momentum being the vector sum of the linear momentum of each particle in the system.