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Answer 1 · 2017-06-20T18:20:39

The correct option is #(3)=0Nm#

The torque is the rate of change of angular momentum

#tau=(dL)/dt#

The angular momentum is #L=30Js#

The time is #t=20s#

Since #L=#constant

The torque is

#tau=(dL)/dt=0/20=0Nm#