A little girl (30 kg) goes sledding with her friends. The hill the girl starts on is 7 meters tall. She reaches a speed of 6.26 m/s when she is 5 meters above the bottom of the hill. What is her mechanical energy when she is 5 meters above the ground?

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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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