Asled of mass 15 kg slides across the ground with a friction force of 80.85 n. what is k between the sled and the ground?

increase masses, decrease separation

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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