Work Step by Step
If air resistance is neglected, the ball’s mechanical energy doesn’t change, i.e., it is conserved. Initially the kinetic energy is a maximum, and as it rises, some is converted to gravitational potential energy. At the top, the ball’s gravitational potential energy is a maximum and the KE is zero. As the ball falls, the potential energy is converted back into KE. Though the form changes, the total energy remains constant.