Question

2. Moment of inertia of a spinning object drops to 5
of its initial value. The ratio of new rotational kinetic
energy to initial rotational kinetic energy is
(1) 1:3
(2) 3:1
(3) 3:2
(4) 2:3​

Answer 1

Answer: 3 : 1

Explanation:

Using law of conservation of angular momentum we can solve this

Answer on pic

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