In a pendulum, a continuous change occurs between kinetic energy and potential energy. Thus option A is correct.
The energy has been the capacity of doing work. According to the law of conservation of energy, it can not be created, nor destroyed. Energy can be converted from one form to another.
The energy possessed by the substance when it is performing motion or a task has been termed Kinetic energy. Potential energy has been the energy of the substance at rest.
Electromagnetic energy has been energy possessed by the wave in space. The thermal energy has been the energy of heat, while mechanical energy has been the energy of performing work.
In the pendulum, the object has been continuously trying to come to the rest position. Thus, the kinetic energy of the pendulum has been continuously interchanging with the potential energy. Thus option A is correct.
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