Equation of the progressive wave is given by : $y = a\sin \pi (40t - x)$ where $a$ and $x$ are in metre and $t$ in second. The velocity of the wave is ..... $m/s$
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(c) $v = \frac{{{\rm{Co - \,efficient \,of\,\, }}t}}{{{\rm{Co - efficient \,of\, }}x}} = \frac{{40}}{1} = 40\,m/s$
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