Due to the force of gravity, a freely released body falls towards the Earth. The reaction to the gravitational force is of equal magnitude and acts on the Earth at its center. Explain why we do not observe the motion of the Earth towards the body.
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Because the mass of the Earth is so many times greater than that of the given body, the change in its position and speed is very slight, unobservable with the naked eye, essentially zero. According to the law of gravity and Newton's law of forces F=M*a, where M >>m, the Earth's gravitational force gives a minimal acceleration.
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