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As distance between crest and trough is 10 m, the wavelength is 10*2 = 20 m
Frequency = Number of cycles per second or, in this situation, number of full waves per second = 20 Hz
Velocity of ripple = Wavelength * frequency = 20 * 20 = 400 m/s
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the wavelength is 10 CM not 10 M .
so the velocity of the ripple is 4.00 m/s
Yes you are correct. Sorry for the mistake.