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Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding the [energy-conservation] tag if it is specifically about its conservation.

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Where does the kinetic energy of an electric motor driven in reverse go?

the kinetic energy of the rotor. … The kinetic energy of the rotor is decreasing, so what are the both of them transformed into? …
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