Answer:
Step-by-step explanation:
Since this question is in physics I am going to guess that it is about Hooke's Law which measures the force of a spring.
In the equation F = kx the k stands for the spring constant. It is a measure of the spring's stiffness and strength. The x is how much it extended or compressed (or the displacement) from the spring's equilibrium position (a position from where the spring oscillates about (goes back and forth from) and where the spring's net force is 0