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Laws Of Motion

Question
CBSEENPH11016515

Air is thrown on a sail attached to a boat from an electric fan placed on the same boat. Will the boat start moving?

Solution
Action and reaction are equal and opposite according  to Newton’s third law of motion. Action and reaction are acting on two different bodies.   
When air is thrown by fan placed on the same boat on which sail is attached, then action and reaction are on the same boat. Hence motion of the boat will not take place.