A rock with the weight of 0.40kg is moved to the a planet where the weight is measured to be 10N. (The radius of the planet is 4.0 × 106 m. )What free fall acceleration will the 0.40kg object experience when moved to a distance of 2.1× 106 m from the surface of the planet?

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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!