[SOLVED] Potential energy problem A man that has a mass of 80.0 kg, wearing a backpack with a mass of 20.0 kg, climes 8848 m to the top of Mount Everest. What is his potential energy? The only one I know of is PE=mgh I added the masses, then plugged it into the equation, but I didn't get the answer. Edit:It was already in meters. Sorry. Thank you for your time.