Figure shows the displacement y versus time t of the point on a string at x = 0, as a wave passes through that point. The scale of the y axis is set by ys = 6.0 mm. The wave has form y(x, t) = ym sin (kx ?? at + ?). What is ?? (Caution: A calculator does not always give the proper inverse trig function, so check your answer by substituting it and an assumed value of w into y(x, t) and then plotting the function.)

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y (mm)