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|dw:1350647588577:dw|
hint: theta will vanish.

\[2\sqrt{\frac{ r }{ g }}\]vs\[\frac{ \pi }{ 2 } \sqrt{\frac{ r }{ g }} \]
\[...\huge ?\]

lol calc then
one of them is the right one.

wut.

you sure about the sqrt for the g?

these are times.

yup. doesn't the g during the derivation has a square?

|dw:1350732149436:dw|
compare v1 and v2 when it reach center O
|dw:1350733431967:dw|