1. The problem statement, all variables and given/known data If 6 J of work is needed to stretch a spring from 10 cm to 12 cm, and another 10 J is needed to stretch it from 10 to 12 cm, what is the natural length of the spring? 2. Relevant equations W=FD Hooke's Law 3. The attempt at a solution Honestly, I stare at this problem and am at a loss as to where to start, and there are no examples in the book like this. Obviously I'm not asking for answers because I know the rules here, we're supposed to show effort; but if someone gave me some starting help it would be much appreciated.