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A metallic bob of mass ‘m’ attached to a string, is raised through a height of 50 cm and released. At what distance along the vertical from the point of suspension should a nail be placed so that the bob just completes a circle with the nail as the centre?

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A metallic bob of mass ‘m’ attached to a string, is raised through a height of 50 cm and released. At what distance along the vertical from the point of suspension should a nail be placed so that the bob just completes a circle with the nail as the centre?



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