Can someone please help me:(
What is the magnitude of the acceleration, in m/s2, of the box of books labeled D?

Incomplete question!

you have to provide mass to get acceleration

as Newton's 2nd law, force=mass×accln

now,here force toward D is 100N,if it hav mass m

then accln will be 100/m

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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