A uniform circular disc of mass m and radius R is rolling without slipping on a smooth horizontal surface as shown in figure. The disc collides with a rough vertical wall having coefficient of restitution 0.6. If the disc rolls without slipping after collision with the wall, and the coefficient of friction is n/10, then find n.

A uniform circular disc of mass m and radius R is rolling without slip

1.	A uniform circular disc of mass m and radius R is rolling without slipping on a smooth horizontal surface as shown in figure. The disc collides with a rough vertical wall having coefficient of restitution 0.6. If the disc rolls without slipping after collision with the wall, and the coefficient of friction is n/10, then find n.
Answer» ANSWER :4