5 A small ball \(B\) of mass 0.4 kg moves in a horizontal circle with centre \(O\) and radius 0.6 m on a smooth horizontal surface. One end of a light inextensible string is attached to \(B\); the other end of the string is attached to a fixed point 0.45 m vertically above \(O\).
- Given that the tension in the string is 5 N , calculate the speed of \(B\).
- Find the greatest possible tension in the string for the motion, and the corresponding angular speed of \(B\).