Final answer:
The wave speed and phase constant cannot be determined without additional information.
Step-by-step explanation:
The wave speed can be determined by dividing the frequency by the wavelength. In this case, the frequency is given as 5.0 Hz and the wavelength is not provided, so we cannot calculate the wave speed without that information.
The phase constant of a wave can be found by examining the equation for the wave function. In this case, the wave function is not provided, so we cannot determine the phase constant either.