Final answer:
The net force acting on the cart is -5N towards the left. This result is obtained by subtracting the 15N of force pulling to the right from the -20N of force pulling to the left, using principles of Physics.
Step-by-step explanation:
The concept of net force is a fundamental principle in Physics. In this scenario, we subtract the force acting to one direction from the force acting to the opposite direction.
Here, let's assume that the force pulling to the right is positive. The force pulling the cart to the right is 15N and the force pulling the cart to the left is -20N (negative since it's in the opposite direction).
When you subtract these two forces, 15N - (-20N) = -5N. So, the net force acting on the cart is -5N. The negative sign indicates that the net force is acting in the direction of the left force.
Learn more about Net Force