• moves in opposite direction in which the air is blown

  • does not move

  • moves in the same direction in which air blows

  • spins around


In this case air blown by the fan will try to push the sail boat in a certain direction. But at the same time due to Newtons third law of motion the fan will experience a force due to the air blown in a direction opposite to the direction in which the sail boat will experience the force due to the blown air. So, as a whole the system will be at rest and it will not move.

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