posted by jen .
A woman is sitting in a boat at anchor on a lake. Her boat bobs up and down once every 2.0·s. She notices that when the front of her 3.0·m long boat is at one wave crest, a second crest is at the middle of her boat, and a third is at the end.
What is the frequency of the waves? ____ Hz.
What is their wavelength? _____ m.
What is their speed? _____- m/s.