Albert Einstein stands on the platform of a scales in the elevator car. Assume that Einstein's mass is 72.2 m = kg. When the elevator is stationary and does not move, its weight is W = m x g = 72.2 x 9.8 = 708 N. But if the elevator moves upwards at a constant acceleration, the scales show more weight, and if the elevator moves downwards at the same acceleration, the scales show less weight. Can you explain the reason? This is my physics question

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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!