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Normal Force

An aeroplane ...

Question

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

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