4 meters/2 seconds = 2 meters/second.
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Frequency (1/seconds) x Wave Length (meters) = Speed (meters/sec. or m/s)
Frequency = (speed) / (wavelength) = 900/9 = 100 Hz.
Speed = Wavelength X Frequency Therefore, 3.92 m/s (meters per seconds)
Speed = (wavelength) times (frequency) = (wavelength) divided by (period) = 30/5 = 6 meters per second