A transverse wave is traveling on a string stretched along the horizontal x-axis. The equation for the vertical displacement y of the string is given by Y(x,t)= 0.0020 cos((30x-20t)), where all quantities are in SI units. The speed of the wave is O 2.5 m/s 1.14 m/s 3.47 m/s 1.75 m/s 0.67 m/s