Angular velocities of two bodies rotating in same direction are given by ω1 = 30 rad/sec. ω2 = 60 rad/sec, the relative angular velocity of 2nd body with respect to 1st body is
30 rad/sec
−→ω1=(30 rad/s)^n; −→ω2=(60 rad/s)^n
∴ ω21=ω1+ω2
=60-30
=(30 rad/s)^n