Answer: 2a (horizontal, direction of motion).
- A 2a (horizontal, direction of motion)
- B a in most textbook accounts during normal conditions
- C zero as generally observed in typical laboratory settings
- D a in vertical direction under usual circumstances
Correct answer: A. 2a (horizontal, direction of motion)
Explanation: The top point has velocity 2v. Its acceleration has both centripetal (ω²R = a upward) and translational (a forward) components. The horizontal component is 2a (both a<sub>cm</sub> and centripetal contribute horizontally).
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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