Which of the following energy changes occurs as a bow is drawn and released?

1. gravitational potential to chemical potential

2. magnetic potential to kinetic

3. elastic potential to kinetic

4. kinetic to thermal

3. elastic potential to kinetic

Mechanical energy is the top suject while it has two types: Kinetic energy which is the energy in motion and potential energy which is the energy in reserve. The measure of both energy in motion and reserve is called Joules. Joules then is the International System of Measurement unit for energy, this is mainly used to account for scaling energy in all aspects.