A disc with moment of inertia I_{1} = 40 kg • m^{2} and angular velocity ω_{1} = 20 rad/s is dropped on to a stationary second disc along the axis of rotation. The second disc has moment of inertia I_{2} = 60 kg • m^{2}. What is the angular velocity of the two discs?

A. 12 rad/s

B. 8 rad/s

C. 4 rad/s

D. 20 rad/s

E. 6 rad/s

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