The velocity of the wave is 40 m/s
Explanation:
The relationship between the velocity of a wave and its frequency and wavelength is given by
[tex]v=f \lambda[/tex]
where
v is the velocity
f is the frequency
[tex]\lambda[/tex] is the wavelength
For the ocean wave in this problem, we have:
[tex]\lambda = 10 m[/tex] (wavelength)
f = 4.0 Hz (frequency)
Therefore, its velocity is
[tex]v=(4.0)(10)=40 m/s[/tex]
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