Which of the following statements is true? a. The bodies interacting exerts equal gravitational force on each other. b. The gravitational constant G varies depending on the medium. c. The less massive object exerts more gravitational force than the massive one. d. The massive object exerts more gravitational force than the lesser one.

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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!