An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT

(C) an airplane in horizontal flight when the thrust of the engine is equal to the drag of the air

Explanation

In horizontal flight, the engine thrust pushes the plane forward and air drag holds it back: If they are equal. there will be no change in speed.

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