A flywheel weighing 4 kg rotates freely around a horizontal axis passing through its center, making 720 rpm. The mass of the flywheel can be considered distributed along its rim with a radius of 40 cm. After 30 s, under the influence of the braking torque, the flywheel stopped. Find the braking torque and the number of revolutions that the flywheel makes until it comes to a complete stop.
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