These two graphs describe the same wave. Graph 1 shows how displacement varies with time at one fixed distance. Graph 2 shows how displacement varies with distance at a single moment in time. What is the wave speed?
- A$22.5\,\text{cm s}^{-1}$
- B$30.0\,\text{cm s}^{-1}$
- C$90.0\,\text{cm s}^{-1}$
- D$120\,\text{cm s}^{-1}$