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**1. Homework Statement**

A system loses 400 J of potential energy. In the process it does 400 J of work on the environment and the thermal energy increases by 100 J. Show this process on an energy bar chart.

**2. Homework Equations**

Ui + Ki + Wext = Uf + Kf + change in thermal energy

**3. The Attempt at a Solution**

I drew a bar with value +400 J for Ui, +100 J for Ki, and -400 J for Wext. Then I drew a bar of +100 J for change in thermal energy. The part I'm not sure about is the +100 J for Ki since the problem doesn't say anything about losing kinetic energy. But that was only way I could think to make the equation balance.

Any thoughts would be greatly appreciated.