Answer: (1/2)Iω².
- A (1/2)Iω²
- B Iω²
- C (1/2)mv²
- D Iω
Correct answer: A. (1/2)Iω²
Explanation: KE_rot = (1/2)Iω², the rotational analogue of (1/2)mv² for translational KE.
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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