A sinusoidal wave moving along a string is shown twice in the figure, as crest A travels in the positive direction of an x axis by distance d = 6.40 cm in 4.10 ms. The tick marks along the axis are separated by 10.0 cm; height H = 6.80 mm. If the wave equation is of the form $y(x, t) = y_m \sin(kx \pm \omega t)$, what are (a) $y_m$, (b) k, (c) $\omega$, and (d) the correct choice of sign in front of $\omega$?
(a) Number 3.40 mm
(b) Number ! Units rad/m or $m^{-1}$
(c) Number ! Units rad/s
(d) -