The graph illustrates how the displacement of water particles changes with distance along the wave at one specific instant for a transverse water wave. $P$, $Q$ and $R$ indicate the locations of three water particles in the wave. Which particle has the largest speed at the instant shown?
- Aall have the same speed
- Bparticle $P$
- Cparticle $Q$
- Dparticle $R$