Sky divers jump out of a plane at an altitude of 5000 m. How much time will pass until they deploy their parachutes at an altitude of 1220 m? Assume that air resistance is negligible.
t=_s

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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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