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MHT CET Physics question

PhysicsLaws of MotionMHT CET

If the frequency of rotation of a pedestal fan increases (about horizontal axis of rotation) from 5 r.p.s. to 7 r.p.s. in sec. Its average angular acceleration about the same axis is :

Answer: (A)

Solution

; 8 and 12 come from wrong

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Question ID VK-040365