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Air is thrown on a sail attached to a bo...

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

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No when the fan pushes the sail by air also pushes the fan in the opposite direction . Since fan is placed on the boat , the vector sum of linear momenta of fan and boat is zero . The boat can move only under the force of reaction from some external agency .
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