Answer to Question #35449 in Calculus for shaquetta Reese

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 33 cm. If a 140 Newton force is required to keep the spring stretched to a length of 51 cm, how much work is required to stretch it from 47 cm to 69 cm?