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In a dumbbell having two small spheres e...

In a dumbbell having two small spheres each of mass `2M` connected by a massless rod of length `d` . Sphere `A` is attached to a frictionless pivot so that `B` hangs freely,vertically.At some instant of time,a strong wind begins to apply a constant horizontal force `F` on `B` .Dumbbell rotates about `A` in vertical plane.Speed of `B` at the instant when dumbbell in horizontal is `sqrt((Fd-2Mgd)/(xM))` .Find x

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