A man standing at the centre of a turn table which is rotating at an angular velocity of 10 rad/s, with its arms out stretched. He suddenly folds his arms. If the moment of inertia of the turn table is 2.5 kg−m2, moment of inertia of the man with stretched arms is 0.3 kg−m2 and moment of inertia of the man with folded arms is 0.1 kg−m2, then final angular velocity of the turn table is