Question: A disc of mass m = 50 g slides with the zero initial velocity down an inclined plane set at an angle a = 30

A disc of mass m = 50 g slides with the zero initial velocity down an inclined plane set at an angle a = 30° to the horizontal; having traversed the distance l = 50 cm along the horizontal plane, the disc stops. Find the work performed by the friction forces over the whole distance, assuming the friction coefficient k = 0.15 for both inclined and horizontal planes.

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