You are sitting on a very slowly sinking ship out at sea. All of the electronics of the ship are fried so you cannot radio for help. You decide to write a message, put it in a bottle,
and throw it overboard. The waves have an amplitude of 0.4 m and their period is 5 s.
How long will it take the waves to move the water and deliver your message in a bottle to
land that is 3 km away?
Write a few complete sentences to explain how to determine this value.