system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If you drop a bowling ball off the skyscraper and it hits the ground with a lot of energy and destroys someone's car, where did the energy come from?

like was the energy created by gravity? Because I thought energy couldn't be created or destroyed.
gpt
When you hefted the bowling ball up the fifteen flights of stairs, you converted chemical potential energy (muscles) into kinetic energy (movement. In this case, up the stairs.) and this gives the bowling ball gravitational potential energy. The extra energy you had to spend lugging the bowling ball is then converted into kinetic energy again when the ball is dropped.