A student wishes to measure the speed of a falling tennis ball. Describe the equipment and steps she must take in order to obtain a precise measurement.

good for her? ? where is the question?

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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