- #1

OVB

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I set 1/2(m)Vo^2 + mgL(1-cos(8)) = 2mgL

and got Vo = square root of 2gL + 2gLcos(8), but my book says it is the square root of 3gL + 2gLcos(8). I don't see what's wrong with my set up, as I have checked the result of this set up several times and got the same answer.