Final answer:
The velocity of a water wave with a 25 m wavelength and a 4.0 Hz frequency is 100 m/s, calculated by multiplying the frequency by the wavelength.
Step-by-step explanation:
The velocity of a wave can be calculated using the formula velocity = frequency × wavelength. For a water wave with a wavelength of 25 m and a frequency of 4.0 Hz, we can determine its velocity by multiplying these two values together.
Velocity = Frequency × Wavelength
Velocity = 4.0 Hz × 25 m
Velocity = 100 m/s
Therefore, the velocity of the water wave is 100 meters per second (m/s).