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The kinetic energy of the hands of the clock is converted from the potential energy of the spring, that is wound initially.

   Elastic tortional energy in the sping (Potential energy) + kinetic energy spent the hands of the clock = Initial energy given by winding = constant

   1/2 * T * θ²  + (power required to move the hands) * (time elapsed after winding the key) = 1/2 T * θ₀²

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