Since the tractor is pulling both carts, we can assume that there is a force acting on both carts in the same direction as the acceleration of the tractor. This force is known as the force of tension, and it is transmitted through the connecting ropes between the tractor and the carts.
The force of tension acting on each cart can be calculated using Newton's second law, which states that the force acting on an object is equal to its mass multiplied by its acceleration. Therefore, the force of tension on Cart A can be calculated as:
Force of tension on Cart A = mass of Cart A x acceleration
= 300 kg x 3 m/s^2
= 900 N
Similarly, the force of tension on Cart B can be calculated as:
Force of tension on Cart B = mass of Cart B x acceleration
= 200 kg x 3 m/s^2
= 600 N
Therefore, the forces acting on both carts are the force of tension, which is equal to 900 N for Cart A and 600 N for Cart B. Since there is no friction assumed in this situation, there are no other forces acting on the carts.