An airplane is flying in horizontal flight at a constant velocity. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wings. The engine produces a forward thrust force of 2,000 N. Which of the following statements is true?
A) The net force on the airplane is zero.
B) The net force on the airplane is forward.
C) The net force on the airplane is upward.
D) The net force on the airplane is downward.
E) The net force on the airplane is backward.

Question

Quizplus · Accepted Answer

Since the airplane is flying at a constant velocity, we know that the net force must be zero according to Newton's first law of motion. Therefore, the lift force and weight force must be balanced, and the thrust force and drag force must also be balanced.

An Airplane Is Flying in Horizontal Flight at a Constant