How potential energy and kinetic energy are related?

bouncing ball

Potential energy is converted to kinetic energy upon expulsion. When the ball is in your hand, it has potential energy due to it's position (being off the ground), once the ball is released, the energy is converted into kinetic energy as it falls. At the release the potential energy is highest, the kinetic energy is lowest, the second it touches the ground, the potential energy is lowest, and the kinetic energy is highest.