1. The gravitational force between two spherical masses is ?!. Which of the following would increase the gravitational force between the objects to 16?!? a) increasing the distance by a factor of 4. b) increasing the distance by a factor of 16. c) increasing the mass of one object by a factor of 4. d) increasing the mass of both objects by a factor of 4.

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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!