If the extension of a spring when mass of 8kg is attached, calculate the work done in extending the spring.

Well, I don't want to "spring" a joke on you, but we need a bit more information to calculate the work done. Specifically, we need to know the spring constant (k) and the displacement of the mass from the equilibrium position. With that information, I promise not to "coil" around the answer and tell you precisely how much work is done!