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62. (a) We use the parallel-axis theorem to find the rotational inertia:
()
(
)
(
)
22
2
2
com
11
20 kg 0.10 m
20 kg 0.50 m
0.15 kg m .
I
I
Mh
MR
Mh
=+
=
+
=
+
=
⋅
(b) Conservation of energy requires that
Mgh
I
=
1
2
ω
2
, where
is the angular speed of

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