Question

on a stationary sail boat air is blown at the sails from a fan attached to the boat.The boat will move
a) remain stationary
b) move in opposite direction
c) spin around
d) move in same direction

Answer 1

answer: a
it will remain constant
reason:
the force exerted by the air of fan on the boat is internal and for motion external force is required
so it will remain constant



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Answer 2

b) will move in opposite direction as fan will apply force in backwards direction and results in causing the boat to move forward.