The gravitational force of a star on an orbiting planet 1 is F1. Planet 2, which is four times as massive as planet 1 and orbits at twice the distance from the star, experiences gravitational force F2. What is the ratio F2/F1? You can ignore the gravitational force between the two planets.

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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!