Rolling: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Rolling. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true: For pure rolling, the point of contact velocity is zero, and friction provides the necessary torque.

Reason (R) is false: For a disc rolling without slipping down an inclined plane, friction is present and acts up the incline to provide the torque for rotation. Thus, (A) is true, (R) is false.