5. The force of gravity acting on an object at four Earth radii from Earth's centre is 500 N. At a distance of two Earth radii, the force of gravity acting on the same object would be A) 2000 N B) 1000 N C) 500 N D) 250 N E) 125 N directly proportional to the force of attraction

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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!