* Forces are vectors: This means they have both magnitude (how strong they are) and direction.

* Net force is the sum of all forces: We need to consider both the force pulling right and the force pulling left.

Since the forces are in opposite directions, we subtract them:

* Net force = Force right - Force left

* Net force = 15 N - 15 N

* Net force = 0 N

Therefore, the net force on the wagon is 0 N. This means the wagon is either at rest or moving at a constant velocity (not accelerating).