Question

Suppose the lift force on the plane in the diagram below was larger than the force of gravity. Which of the following statements best describes what the effect on the motion of the plane would be?
A. The plane would accelerate upwards.
B. The plane would increase its forward velocity.
C. There would be no effect on the motion of the plane.
D. The plane would move upwards with a constant velocity.

Answer 1

A because when gravity and the force are equilibrium it tend to be equal or stay at rest or constant velocity. But when the force of a plane is less than the force of gravity it will go down to the ground. Unless when the force of a plane is greater than the force of gravity, the plane will move upward at increasing rate. 
Hope this helps