A gramophone record takes 5s to reach its constant angular velocity of 4\(\pi\) rads^-1 from rest. Find its constant angular acceleration.

• A.0.4\(\pi\) rads^-2
• B.0.8\(\pi\) rads^-2
• C.1.3\(\pi\) rads^-2
• D.20.0\(\pi\) rads^-2
• E.