A jet plane is moving at a constant velocity on a flat surface. Which forces act against the forward motion of the plane? A. Gravity and engine thrust B. Engine thrust and friction C. Friction and air resistance D. Air resistance and gravity

C Friction and air resistance

Explanation:

The force of friction acts in a direction opposite to the direction of motion of an object in contact with a surface. The amount of friction is proportional to the moving object's weight and a coefficient of friction (which is dependent on the object-surface contact material).

Air resistance, similar to surface-induced friction, acts as a deceleration force. Its magnitude depends on the object's speed and surface area.