A helicopter is delivering food in an emergency situation, where it is difficult to land. The engineer is tasked with determining what heights the package could be
dropped without breaking. She knows that if the package strikes the ground
faster than the critical speed of 64.Omph, then the package will break. Neglect
drag.
At what height would the package hit the ground with the critical speed (in given
units)?

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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