A transverse water wave has frequency $15\,\text{Hz}$, wavelength $0.12\,\text{m}$ and amplitude $4.0\,\text{mm}$. $P$ is a water particle that starts at the crest of the wave, as shown. What total vertical distance does $P$ travel in a time of $0.5\,\text{s}$?
- A$30\,\text{mm}$
- B$60\,\text{mm}$
- C$120\,\text{mm}$
- D$900\,\text{mm}$