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In the figure shown a lift goes downward...

In the figure shown a lift goes downwards with a constant retardation. An observer in the lift observers a conical pendulam in the lift, revolving in a horizontal circle with time period 2 seconds. The distance between the centre of the circle and the point of suspension is 2.0 m. the retardation of the lift in `m//s^(2)` is

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