Two equal masses are floating in space. The distance between their centers is X. How would the gravitational force between them change if the mass of one of the objects was cut in half?  1. The force would be the same.  2. The force would be one-fourth as much.  3. The force would be one-half as much.  4. The force would be twice as much.

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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!