Question

it is not possible to displace a boat by using a fan placed within the boat

Answer 1

Yes.
It is because the force provided by the fan is not enough to overcome the force of friction between the boat surface and water and boat is still.

Answer 2

yes , it is not possible to displace a boat by using a fan placed within the boat because the friction which is in boat is not enough to move it by a fan . so it is impossible to move but if there is a strong fan it is easy to move because it contains more air pressure , so it can move it .

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