Question: A disk rotates freely on a vertical axis with an angular velocity of 6 0 rpm . An identical disk rotates above it in the

A disk rotates freely on a vertical axis with an angular velocity of 60 rpm . An identical disk rotates above it in the same direction about the same axis, but without touching the lower disk, at 20 rpm . The upper disk then drops onto the lower disk. After a short time, because of friction, they rotate together.
Part A
The final angular velocity of the disks is
48 rpm
72 rpm
8 rpm
96 rpm
40 rpm
A disk rotates freely on a vertical axis with an

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