Answer: 2v.
- A 2v
- B v
- C 0
- D v/2
Correct answer: A. 2v
Explanation: In rolling without slipping, the top point has velocity 2v (translational v plus rotational ωR = v), while the contact point has velocity 0.
Torque about axis O equals the force F multiplied by the perpendicular distance r⊥ from the axis to the line of action of the force, producing rotation.
Concept context
Moment of inertia, torque, angular momentum, rolling motion. Very high JEE weightage.
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