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[" A stationary wave is represented by "y=A sin(100t)cos(0.01x)," where "y" and "A" are in millimetres,"t" is "(420*2v+0)/(10" seconds and ")],[x" is in metres.The velocity of the wave is "],[[" (A) "10^(4)m/s," (B) not derivable "," (C) "1m/s," (D) "10^(2)m/s]]

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