Auniform rod of length l is free to rotate in a vertical plane
about a fixed horizontal axis through O. The rod begins
rotating from rest from its unstable equilibrium position.
When it has turned through an angle ϴ, its angular velocity
⍵ is given as
(a) √6g/l sin ϴ (b) √6g/l sin ϴ/2
(c) √6g/l cos ϴ/2
(d) √6g/l cos ϴ
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