A flywheel starts from rest and reaches 30 rad/s in 6 s with uniform angular acceleration. What is its angular acceleration?
Correct answer C. 5 rad/s²
Explanation
α = (ω_f − ω_i)/t = (30 − 0)/6 = 5 rad/s². Multiplying ω by t instead of dividing gives 180, and inverting the ratio gives 0.2.
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