A person weighs 900 N on the surface of the Earth. Planet X has the same mass as Earth but twice the radius. What is the weight of the person on Planet X? a)  225N b)  450N c)  900N d)  1800 N e)  3600 N

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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!