A person stands on a scale inside an elevator at rest . The scale reads 800 N.  a) what is the persons mass? b) The elevator accelerates upward momentarily at the rate of 2 m / s ^2. What does the scale read then? c) The elevator then moves with a steady speed of 5 m / s. What does the scale read now?

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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!