Task 10315.

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A solid cylinder with a mass of 20 kg and a radius of 40 cm rotates. Under the action of friction forces, it moves slower and stops, and the work of the friction forces is 1568 J. With what period did the cylinder rotate before the start of braking?

Detailed solution with a short recording of the conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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