What is equal and opposite to the applied force on a spring?(1 point)

a. spring force

b. spring constant

c. displacement

d. equilibrium

To determine the answer to this question, we need to understand the concept of the applied force on a spring and the forces involved in a spring system.

When an external force is applied to a spring, the spring exerts an equal and opposite force on the object in accordance with Newton's third law of motion. This force is called the "spring force."

The spring force is the force exerted by a stretched or compressed spring and it is always directed in the opposite direction to the displacement of the spring from its equilibrium position.

So, the correct answer to the question is:

a. spring force.