A long thread suspended from a fixed point has a small mass swinging to and fro at its lower end ........

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A long thread suspended from a fixed point, has a small mass swinging to and fro at its lower end.

The potential energy of the mass is maximum in the middle of the swing

the kinetic energy is maximum in the middle of the swing

the potential energy is always equal to the kinetic energy

the sum of the potential energy and the kinetic energy is maximum in the middle of the swing

4th option is correct. The sum of the potential energy and the kinetic energy is maximum in the middle of the swing

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