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**Problem**: A disc with moment of inertia I1 = 40 kg • m2 and angular velocity ω1 = 20 rad/s is dropped on to a stationary second disc along the axis of rotation. The second disc has moment of inertia I2 = 60 kg • m2. 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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###### Problem Details

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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