The relationship between the gravitational potential energy and kinetic energy and mechanical energy should be explained below.
Relationship of various energies:
In the case of a simple pendulum that does not contain friction, here the mechanical energy should be conserved. The total mechanical energy comprises of kinetic energy and gravitational potential energy. At the time when the pendulum should swing back and forth so there should be a constant exchange that lies between the kinetic energy and gravitational potential energy.
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