angular velocity of the rod

Question

1. A rod of length 1m is sliding in a corner as shown in Fig. 2.7. At an instant when the rod makes an angle of 60 degrees with the horizontal plane, the velocity of point A on the rod is 1m/s. The angular velocity of the rod at this instant is                                                                                                                                                    

 

 

      (a) 2 rad/s                                                           (b) 1.5 rad/s

      (c) 0.5 rad/s                                                        (d) 0.75 rad/s