Suppose you're on a cruise ship and encounter foul weather; the water's surface has high-amplitude waves. Unfortunately, you have a history of vomiting profusely when bobbing up and down at a frequency exceeding 6 up/down cycles per minute. If the speed of the waves (relative to the ship) is 35 meters per minute and the spacing between successive wave crests is 7 meters, should your cruise friends (who don't like being covered with vomit) stay away from you?