An astronaut (whose weight is 1000 N on Earth) travels to planet X. Planet X has four times the mass and twice the radius of the Earth. Determine the weight of the astronaut on planet X. 1000 N 2000 N 500 N 250 N 4000 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!