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Prashant kumar
No, the kinetic energy can't be mgl×cos theta. the correct values of kinetic and potential energy are attached.
sir material me kinetic energy=mgl cos theta tha
That may be mis-printed so please don't penic . my answer is correct you can match in any book.
there is many more misprint in material this is not fair
and potential energy = mgl(1-cos theta)