You make a couple observations of a harmonic wave traveling to the right on the string. A photograph of the string at t = 0 exhibits that there is a crest at x = 0 and that the crests are separated through 2m. Watching the motion of the string bit at x = 0 m, you see that it takes it 0.1s to go from its lowest to its highest point and that distance is 0.2m. Write down an explicit expression f(x, t) which explains this wave.