1. Understand the Forces:

* Thrust: This is the force produced by the engine that propels the airplane forward.

* Friction/Drag: This force opposes the motion of the airplane. We'll assume it's negligible for this simplified calculation.

* Gravity: This force acts downwards. Since the airplane is on the runway, we'll assume gravity is balanced by the normal force from the ground.

2. Apply Newton's Second Law:

Newton's Second Law states: Force = Mass x Acceleration (F = ma)

* Force: In this case, the net force acting on the airplane is the thrust (since we're ignoring friction).

* Mass: The mass of the airplane is 2000 kg.

* Acceleration: This is what we want to find.

3. Solve for Acceleration:

* Rearrange the equation: Acceleration (a) = Force (F) / Mass (m)

* Substitute the values: a = 500 N / 2000 kg

* Calculate: a = 0.25 m/s²

Therefore, the acceleration of the airplane just before takeoff is 0.25 m/s².