The equation of a transverse wave travelling along a string is $y(x, t) = 4.0 \sin(20 \times 10^{-3} x + 600 t) \ mm$,where $x$ is in $mm$ and $t$ is in seconds. The velocity of the wave is:
- A$+30 \ m/s$
- B$-60 \ m/s$
- C$-30 \ m/s$
- D$+60 \ m/s$
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