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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, From Newton's 2nd law of motion we know that a body comes to acceleration when some external force is applied over the body. When the fan pushes the sail by the air, then air also pushes the fan in opposite direction. The fan is also part of the boat and hence boat cannot be propelled.
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