As the skater descends his kinetic energy increases and his potential energy decreases. The total energy remains constant.
Energy is the ability to do work. Types of energy are potential, kinetic, thermal and so on.
Potential energy is the energy stored in an object due to its position relative to another object. Kinetic energy is the energy due to the motion of an object.
As the skater descends his kinetic energy increases and his potential energy decreases. The total energy remains constant.
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