engineering recuitment BHEL Engineer Trainee Mock Test 2025 Physics Rotational Motion The Angular Momentum
A girl is standing with stretched hands at the center of a platform rotating about its central axis. The kinetic energy of the system is 90 KJ. The girl now folds her arms so that the moment of inertia of the system is one-fourth. The kinetic energy of the system now is
1
45 KJ
2
180 KJ
3
360 KJ
4
90 KJ