Physics · Rotational Motion

A girl is standing with stretched hands at the center of a platform rotating about its central axis. The rotational kinetic energy of the system is 90 kJ. The girl now folds her arms so that the moment of inertia of the system becomes one-fourth of its initial value. The kinetic energy of the system now is:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

190 kJ
2360 kJ✓
3180 kJ
445 kJ

Correct answer

360 kJ

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