Final answer:
To calculate the speed of a wave, you need to use the formula v = λ * f, where v is the speed, λ is the wavelength, and f is the frequency.
Step-by-step explanation:
To calculate the speed of a wave, you need to use the formula v = λ * f, where v is the speed, λ is the wavelength, and f is the frequency.
In this case, the wavelength is given as 3.5 meters. Since the frequency is not given, we cannot calculate the speed of the wave.