A 74-kg person is standing on a scale in an elevator. What is the reading of the scale in newtons if the elevator is at the following speeds? (a) at rest  N (b) moving up with a constant velocity of 3.8 m/s  N

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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!