12) The function of a wave on a stretched string is given by: y(x, t) = 0.4sin(wt - kx + p) where x is in meters and t in seconds. At = 0, an element of the string at x = 0 has a vertical displacement of 0.2 m and is moving in the negative y-direction. The direction of travel of the wave and the phase constant o are given by:
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