Two balls of different masses are dropped from a building and they hit the ground at the same time. How does the force of gravity exerted on each ball depend on it mass?

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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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there are no atoms