If a 300 N action force is exerted to the right, the reaction force will be ___.

To the left.

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Therefore, if a 300 N action force is exerted to the right, the reaction force will be 300 N exerted to the left.

To find the reaction force, we need to apply Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.

According to the third law, if a 300 N action force is exerted to the right, the reaction force will be equal in magnitude but opposite in direction. Therefore, the reaction force will also be 300 N, but exerted to the left.

In this case, the reaction force is determined by the action force, so no further calculations are required.