Answer :
In order to maintain a constant altitude, constant velocity, thrust, and drag must all be equal.
In level flight, the aircraft slows down when the engine power is decreased and the thrust is decreased. The airplane keeps descending as long as the thrust is lower than the drag. In contrast to weight, lift works. The opposite of drag is thrust. A plane flies level flight when the forces are equalized. If the forces of lift and thrust are greater than the forces of gravity and drag, the plane rises.
The lift and push produced by an airplane while it is traveling straight and level at a constant speed balance its weight and drag, respectively.
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