7)  In March 2006, two small satellites were discovered orbiting Pluto, one at a distance of 48,000 km and the other at  64,000 km. Pluto already was known to have a large satellite Charon, orbiting at 19,600 km with an orbital period of  6.39 days. Assuming that the satellites do not affect each other, find the orbital periods of the two small satellites  without the mass of Pluto

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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!