As a section of an workout program to toughen their pectoral muscles a person stretches a spring which has a spring constant k = 520 n/m. write an equation for the work necessary to stretch the spring from the relaxed state to a distance x1.

To develop the problem it is necessary to apply the concepts related to Hooke's Law. For which it is understood that

Where,

k = Spring constant

x = Displacement of Spring

By the theorem of work we understand that it is the force realized when there is the path of an object therefore

Our value of F is

Integrating

Therefore the expresion is

the answer is c i did the same question so i know that's right!