A 0.4 kg red ball is moving at 10 m/s along the positive x axis. The red ball elastically collides with a stationary blue ball. If after the collision the blue ball is traveling 7 m/s at 30 degrees from the x-axis, what is the red balls total velocity after the collision and in what direction?

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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i already answered it by 34/s