JEE Mains Model Paper 13

A rigid semicircular wire AC (of radius 1m) has both its ends A and C on x-axis at a instant, as shown. At this instant, end A has velocity 5m/s along x-axis, while point B (having maximum y coordinate) has velocity 5 m/s along y axis. What is angular speed (in rad/s) of the wire at this instant?