Physics Rotational Motion Rotation with Constant Angular ACceleration

An electric motor increases its speed from 600 rpm to 1200 rpm in 20 s. The angular acceleration of the motor is 

1
\(\pi \text{ rad/}{{\text{s}}^{2}}\)
2
\(2\pi \text{ rad/}{{\text{s}}^{2}}\)
3
\(5\pi \text{ rad/}{{\text{s}}^{2}}\)
4
None

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