Answer:
Spring Constant
Step-by-step explanation:
Hooke's law: The force required to squeeze or expand a spring by a distance (d) is directly proportional to the distance. It is given as,

Here, K = spring constant.
It is measure of the stiffness of the spring. If we draw the graph of Force with respect to the distance it will be a linear plot passing through the origin. The slope of the plot will be equal to K.