A balloon drifts 140 m toward the west in 45 s; then the wind suddenly changes and the balloon flies 90 m toward
the east in the next 25 s.
What was its displacement during the first 45s?

no

sodium is solid at rt

i will answer your question if you answer mine

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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