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jonny001

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**-**(Fu)1/2 x A2w2 Sin2(Kx-wt) . (Note the negative sign)

The Problem is I am not able to derive this. In derivation I am not getting the negative sign (which i suppose to). Could someone please explain what is power in transverse wave traveling to left represented by Y=ACos(kx + wt).

The concept I am applying is Instantaneous power P=F.V. Please see the diagram.

I hope you can understand what i am saying