Dude's friends on shore have noticed, however, and are anxiously watching as he rides the crests and disappears into the troughs once every 10 seconds. They also noted that exactly 3 crests fit under a passing 32-meter sailboat (from bow to stern).
While waiting for Dude to finish his book, they decided to calculate the period, frequency, wavelength and velocity of the water waves . They need help. Your help. So help them!
