4. Roger the Rooster speeds up from 0 m/s to 2.5 m/s. If he covers 7.5 meters during this time, what
was his acceleration in m/s/s?

momentum of soft ball three times less than baskey ball

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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t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

there are no atoms