Answer to Question #35429 in Calculus for drea

Question

The spring-flex exercise system consists of a spring with one end fixed and a handle on the other end. The idea is that you exercise your muscles by stretching the spring from its natural length, which is 39 cm. If a 190 Newton force is required to keep the spring stretched to a length of 57 cm, how much work is required to stretch it from 57 cm to 64 cm?