gravity and engine thrust engine thrust and friction friction and air resistance air resistance and gravity
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A jet plane is moving at a constant velocity on a flat surface. Which forces act against the forward motion of the plane?
Possibilities:
- gravity and engine thrust
- engine thrust and friction
- friction and air resistance
- air resistance and gravity

friction and air resistance