In the Earth-moon system, we know both bodies actually orbit around the center of mass of the system. Approximately where is this center of mass located? Mearth = 5.97 x 10^24 kg Mmoon = 1.62 x 10^23 kg r = 382,500 km   A) Inside the earth B) Inside the moon C) Halfway between the earth and the moon. D) Cleveland

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!