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A wheel has moment of inertia 5x 10-3 kg-m² and is making 20 revolutions per second. The magnitude of torque needed to stop it in 10 s is:
A 4.5xx 10-2 N-m
B.2.5xx 10-2 N-m
C. 2x 10-2 N-m
D. 4xx 10-2 N-m