- #1

Sofa

- 1

- 14

- Homework Statement
- See attached

- Relevant Equations
- See attached

I've attached a screengrab of the problem (Specifically, Part B, as indicated in the image) and my attempt at a solution. Summarized, my thinking was based on using ##-\Delta U=\frac{Kx_i^2-Kx_f^2}{2}##.

After using up all my attempts, the solution, as it turns out, was U

After using up all my attempts, the solution, as it turns out, was U

_{2}=4.91J. No variation on the above formula - or any I know, for that matter - gets me anything like that. For future reference, what exactly was I doing wrong?