Answer:
a) Equation for spring constant k is

b)Equation for the extension squared is

(c) Equation for the extension e is

Step-by-step explanation:
Given;

where;
E is the elastic potential energy
k is the spring constant
e is the extension of the spring
a) Equation for spring constant k is given as.

(b) Equation for the extension squared e2;

(c) Equation for the extension e;
