Conservation of Energy Problem: Where did it go?? Imagine I shoot a boulder vertically into the air with a massive cannon. Its kinetic energy is converted into gravitational potential, and into KE of air particles (air resistance). So at m metres above the ground, mgh is the Potential energy But what happens once this boulder breaks orbit, free from the earths gravitational pull? I think Im missing something but in my head, the Gravitation Potential just disappears, and the object carries on with any KE left. Thanks for any help, got an exam heavy on conservation of energy in 2 days!