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A ball of mass 1kg is suspended by an in...

A ball of mass `1kg` is suspended by an inextensible string `1m` long attached to a point O of a smooth horizontal bar resting on fixed smooth supports A and B. The ball is released from rest from the position when the string makes an angle `30^@` with the vertical. The mass of the bar is `4kg`. The displacement of bar when ball reaches the other extreme position (in m) is

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