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10.91:
The initial angular momentum is
A
I
ω
L
0
1
=
and the initial kinetic energy is
.
2
2
0
1
ω
I
K
A
=
The final total moment of inertia is
A
I
4
, so the final angular velocity is
(
29
0
4
1
ω
and the final kinetic energy is
(
29

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