A 90-kg stands on a scale in an elevator. What does the scale read when (a) the elevator is ascending with an acceleration of 1.5 m/s2, (b) it is ascending at a constant velocity of 3.00 m/s, (c) it decelerates at 1.5 m/s2,

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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!