Final answer:
The net force when two forces of 300 N and 100 N are both applied to the right is 400 N to the right, as they simply add together.
Step-by-step explanation:
When two forces are applied in the same direction, you simply add them together to find the net force. In this case, with a force of 300 N to the right and another 100 N to the right, the net force is:
Fnet = 300 N + 100 N = 400 N
The net force acting on the object is therefore 400 N to the right. Remember that the net force is the vector sum of all forces acting on an object. In this instance, since both forces are in the same direction, their magnitudes add up.