Question

A disc of mass m = 50 g slides with the zero initial velocity down an inclined  plane set at an angle α= 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.

Answer 1

Let s be the distance covered by the disc along the incline, from the Eq. of increment of