Atwood Machine.  - A mass of 5 kg is suspended on 1 side of a pulley and 5.1 kg is loaded on the other.  State the acceleration of the masses.  How long will it take for the 5.1 kg mass to fall 1 m?  Assume the pulley is frictionless and has no mechanical advantage.

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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!