A woman stands on a weighing scale in a non - moving elevator. When the elevator started to move, the scale momentarily reads only 0.60 of the person’s normal weight. Find acceleration (m/s^2)

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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!