The angular speed of a fly wheel moving with uniform angular acceleration changes from \( 1200 \...

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The angular speed of a fly wheel moving with uniform angular acceleration changes from \( 1200 \mathrm{rpm} \) to \( 3120 \mathrm{rpm} \) in 16 seconds. The angular acceleration in \( \mathrm{rad} / \mathrm{s}^{2} \) is :
(1) \( 104 \pi \)
(2) \( 2 \pi \)
(3) \( 4 \pi \)
(4) \( 12 \pi \)
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