The Answer Is A because Wheels Rotate and its telling you how springs go up and down because that isn't rotation
Answer:
The frequency of a wave is 35 Hz.
Explanation:
Speed of a wave is 140 m/s
Wavelength of a wave is 4 m
It is required to find the frequency. The relation between frequency, speed and the wavelength of a wave is given by :

f is frequency

So, the frequency of a wave is 35 Hz.
Answer: The answer is A just answered it
Explanation: