Mike walks 100 meters north, then walks 30 meters south. after this, he walks another 10 meters north. what is his magnitude of his total displacement during this walk, in meters?

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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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