A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building the scale. The scale reads the 84.7 kg = 830 N. a) As the elevator moves up, the scale reading increases to 840 N, find the acceleration of the elevator. b) As the elevator reaches the 74th floor, the scale reading drops to 782 N. What is the acceleration of the elevator? c) Using your results from parts a and b, explain which change in velocity of the elevator starting or stopping takes the longer time

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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!