Understanding the Concepts

* Newton's Second Law: The fundamental principle we'll use is Newton's Second Law of Motion, which states: Force (F) equals mass (m) times acceleration (a): F = ma

* Net Force: The net force acting on an object is the vector sum of all the forces acting on it.

Calculating the Acceleration

1. Identify the forces:

* Thrust: The force provided by the engine, pushing the airplane forward (500 N).

* Friction and Drag: These forces oppose the motion of the airplane. For simplicity, we'll assume they are negligible just before takeoff.

2. Determine the net force:

* Since we're neglecting friction and drag, the net force is equal to the thrust: 500 N

3. Apply Newton's Second Law:

* F = ma

* 500 N = (2000 kg) * a

4. Solve for acceleration:

* a = 500 N / 2000 kg = 0.25 m/s²

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