If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is_____________________?

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If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is_____________________?

A. —rad/sec 10
B. —rad/sec 20
C. —rad/sec 30(Correct)
D. none of the above