Posted by Pete on Monday, November 22, 2010 at 8:40pm.
The information you have been given allows you to calculate the frequency and the wavelength. In fact, they have told you what the wavelength is already.
The period is P = 12.85/5 = 2.57 s and the frequency is 1/P = ___ s^-1.
The product of wavelength and frequency is the wave speed.
That should enable you to do the calculation.
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