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A nail is fixed at a point P vertically ...

A nail is fixed at a point `P` vertically below the point of suspension 'O' of simple pendulum of length `1 m`. The bob is released when the string of pendulum makes an angle `30^@` with horiozontal. The bob reaches lowest point and then describes vertical circle whose centre coincides with `P` . The least distance of `P` from `O` is

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