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## Homework Statement

Two disks with moments of inertia I and 31 are mounted on a common shaft with frictionless bearings. They are initially rotating with angular speeds of w and 2w. They are brought together without being disturbed. What is their final KE as a fraction of their initial KE?

The answer is 49/52 but i dont understand the concept of it.

can someone please explain?

Equations:

Angular Momentum: Iw = Iw