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The angular momentum of a flywheel having a moment of inertia of 0.4 kg m^2 decreases from 30 to 20 kg m^2 /sin a period of 2 second.

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The angular momentum of a flywheel having a moment of inertia of 0.4 kg m2 decreases from 30 to 20 kg m2 /sin a period of 2 second. The average torque acting on the flywheel during this period is:

(A) 10 N . m 

(B) 2.5 N . m 

(C) 5 N . m 

(D) 1.5 N . m 

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Correct option: (C) 5 N . m

Explanation:

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