From the image description is that when an object is in the highest position. It will stop gravity potential energy to kinetic energy is maximum section will have the lowest value is equal to zero. Once the object starts moving gravity potential energy will begin to decline because of the gravity energy turns into kinetic energy, and as a mobile object in lower reaches the lowest position. Kinetic energy back there. Best gravity potential energy with the lowest value is equal to zero because of the gravity potential energy turns into kinetic energy of all the walls.
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