A disc of circumference S stands vertically on a horizontal surface as shown in figure-5.145, A horizontal force P acts on the centre of the disc. Half of the circumference {ABC) is rough and the friction is sufficient to prevent slipping when the disc rolls along X¥.The other half of the circumference (ADC) is smooth. The disc starts from rest when P begins to act and the point C is at the bottom. Find the distance moved by the disc along xy when it completes one rotation.

Answer

[19S`//`16]