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: Friction provides the necessary torque to initiate the angular acceleration required for rolling.

Reason (R) is true: In pure rolling, the point of contact is instantaneously at rest, so the work done by static friction is zero. Both statements are true, but R does not explain A.