Two boats are anchored 14 meters apart. They bob up and down, returning to the same up position every 7 seconds. The boats rise a vertical distance of 12 meters between their lowest and their highest point. When one is up the other is down. There are never any wave crests between the boats. What is the frequency of the wave?

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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!