1. The problem statement, all variables and given/known data A Force of 7 pounds is required to stretch a 40 inch spring to a length of 43 inches. How much work will be done in stretching the spring an additional 6 inches from its already extended length of 43 inches? 3. The attempt at a solution I know how to integrate , just having problems with taking limits.Will I take the limit from 3 to 9 inches or is it 43 to 49 inches? Will be great if someone can clear it out by explaining why. Thank you.