Two people, each weighing 70 kg, are traveling in an elevator. One stands on the elevator floor and the other hangs from a rope attached to the elevator ceiling. Compare the acceleration a of the first person to the acceleration a 'of the second. a) The 2 are equal and opposite. b) The 2 are the same and have the same address c) The acceleration a is greater than a ', but the 2 have the same direction d) The acceleration a is greater than a ', but they have opposite directions. e) The acceleration a is less than a 'but they have the same direction.

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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!