1.

A standing wave set up in a medium is y=4cos(πx3)sin40πt where x, y are in cm and t in sec. The velocity of particle at x=6 cm at t=18 sec is

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A standing wave set up in a medium is y=4cos(πx3)sin40πt where x, y are in cm and t in sec. The velocity of particle at x=6 cm at t=18 sec is



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