$A$ rotating wheel changes its angular speed from $ 1800 \ rpm $ to $ 3000 \ rpm $ in $ 20 \ s $. What is the angular acceleration,assuming it to be uniform?
- A$ 6 \pi \ rad \ s^{-2} $
- B$ 9 \pi \ rad \ s^{-2} $
- C$ 2 \pi \ rad \ s^{-2} $
- D$ 4 \pi \ rad \ s^{-2} $
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