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Two masses A and B having mass ma and mb respectively, lying in the plane of the fifure shown, are rigidly attached to a shaft which reloves about an axis through O perpedndicualr to the plane of the figure. The radii of rotation of the masses ma and mb are ra and rb, respectively. The angle between lines OA and OB is 90o. If ma=100kg, mb=20 kg,ra=200 mm and rb=400 mm, then the balance mass to be placed at a radius of 200 mm is kg(round off two decimal places)