A man walks south at a speed of 2.0m/s for 30 minutes. He then turns around and walks north a distance 6000m in 15 minutes. What is his displacement of the man from his starting point?

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