Question

On a stationary sail-boat, air is blown at the sails from a fan attached to the boat. The boat will

• A. Remain stationary
• B. Spin around
• C. Move in a direction opposite to that in which air is blown
• D. Move in the direction in which the air is blown

Answer 1

Answer: (A)

The force exerted by the air of fan on the boat is internal and for motion external force is required.