1. The problem statement, all variables and given/known data Picture: https://drive.google.com/open?id=0B39n6QfDU8f3bWY3OWxyaGZBYU0 [Moderator: Image inserted to make problem statement visible] 2. Relevant equations F=-dU/dx 3. The attempt at a solution I have no idea in this question... The slope is always the same for the graph... Also, i have no idea how to link the graph to the equation... Thanks.