An object slides down a rough inclined plane with some non-zero acceleration a1. (There is friction).The same mass is shoved up the same incline with a large, brief initial push. As the mass moves up the incline, its acceleration is a2. Which of the following statements about the magnitudes of these accelerations is true?

a. a1=a2
b. Not enough information
c. a1> a2
d. a2> a1

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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