When an elevator descends from the top of a building and stops at the ground floor what becomes the energy that had been potential energy?
Most of elevator's potential energy was transferred to its massive counterweight, which was lifted high up in the shaft as the elevator descended. Some of its en…ergy was dissipated in both heat and noise. Also, don't forget about the kinetic energy that the car had while it was moving. Most of that was absorbed by either a mechanical brake, or else by the motor that's usually replacing the energy lost from the system. (MORE)