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While considering 3rd law, forces act on different bodies , and not on same bodies. So the body which is hit is under the influence of applied external force only. The force which the hit body applies back to the hitting object is acting on the hitting object, so no point of cancelling of forces as they are acting on different objects. I too used to think ...
I would like to point out this video by minutephysics: https://www.youtube.com/watch?v=R5P6O0pDyMU so far the better and simpler explanation of the color of the sky. It takes into account also color theory (not particle physics of course) and not just scattering.
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