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A floating mass is made to bob up and down on the surface of a pond such that it creates repeating travelling waves. A leaf floats on the surface of the pond near the floating mass.

Which of the following equations could be used to model the vertical displacement from equilibrium of the leaf as a function of time?


$y= 0.01\cos { \left( 15.2t \right) } $




$y= 0.02$


$y=0.03\sin { \left( 12.2x \right) } $

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