Is the law of conservation of mechanical energy fulfilled for a satellite moving in an elliptical orbit? What transformations

Is the law of conservation of mechanical energy fulfilled for a satellite moving in an elliptical orbit? What transformations of energy occur during the satellite’s transition from apogee to perigee?

The mechanical energy of a satellite moving in a vacuum remains constant. At its apogee, the potential energy is greatest; during the transition to perigee, part of the potential energy is converted into kinetic energy.

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