A solid cylinder of mass M and radius R starts from rest and rolls without slipping down an inclined plane of lenght L. Find the speed of its center of mass when the cylinder reaches the bottom
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By conservation of energy
2
1
mν
2
+
2
1
Iω
2
=Mgh
but V=Rω ; I=
2
1
MR
2
⇒
2
1
mν
2
+
2
1
(
2
1
mν
2
)=Mgh
4
3
mν
2
=Mgh
ν=
3
4gh
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