The equation of a wave motion (with $t$ in seconds and $x$ in metres) is given by $y = 7\sin \,\left[ {7\pi t - 0.4\pi x + \frac{\pi }{3}} \right]$. The velocity of the wave will be
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(a)$v = \frac{\omega }{k} = \frac{{7\pi }}{{0.4\pi }} = 17.5$$m/s$
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