What is the gravitational potential energy relative to the ground of a 1.0-kg box at the top of a 50-m building ?

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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