On a stationary sail-boat, air is blown at the sails from a fan attached to the boat (from inside the boat). If the river is still, the boat will
A
Remain stationary
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B
Spin around
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C
Move in a direction opposite to the which air is blown
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D
Move in a same direction in which air is blown.
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Solution
The correct option is A Remain stationary The force due to air from the fan will form an internal force. And as we know, internal forces can't change the state of rest of an object.