An aeroplane of mass is moving uniformly at a constant height under the action of two forces (i) upward force (lift) and (ii) downward force (weight). What is the net force on the aeroplane.
A
Zero.
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B
mg
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C
only downward force
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D
only upward force
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Solution
The correct option is A Zero. If the net force is not zero the plane would be moving upward or downward. Since its height is constant the net force is 0