How Does a Pendulum Convert Kinetic Energy to Potential Energy and Vice Versa?

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Idrees
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Describe the swinging motion of the pendelum in terms of kinetic and potential energy?
 
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Think about the velocity of the mass at the bottom of the string creating the pendelum. When is it 0? When is it at a maximum?

Also, think of the pendelum at equilibrium position and call this your reference height. What would the potential energy be at this position?