The International Space Station is in orbit about 420 km above the surface of Earth. Calculate how many minutes it would take for the ISS to complete one orbit. (E = 6.38 × 106 m, Mɛ = 5.98 × 1024 kg)

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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!