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Four traveling waves are described by the following equations, where all quantities are measured in SI...

Four traveling waves are described by the following equations, where all quantities are measured
in SI units and y represents the displacement.
Wave I: y = 0.12 cos(3x + 2t)
Wave II: y = 0.15 sin(6x - 3t)
Wave III: y = 0.23 cos(3x + 6t)
Wave IV: y = -0.29 sin(1.5x - t)
Which of these waves have the same speed? Explain your answer using necessary equations.

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