- #1
disregardthat
Science Advisor
- 1,861
- 34
Energy cannot disappear as we all know, but then I wonder: If we put force to an object and make it go at a high speed, and then put force to it to make it go back to a halt. Where did the energy go? We used force at acceleration and deceleration, but we only got a change in position for the object. Surely the energy is not lost. (of course we cannot retrieve the energy by forcing the object back in its initial position)