If the equation for the displacement of a particle moving on a circular path is given by θ=2t3+0.5 , where θ is in radians and t in seconds, then the angular velocity of the particle after 2 s from its start is :-
(1) 8 rad/s
(2) 12 rad/s
(3) 24 rad/s
(4) 36 rad/s