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kg.A yo -yo is made up of two cyllindrical disks.
\Mass of the each cyllindrical disk is kg.
Diameter of the each disk is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=40abd24370d25cbfcce3541388c9ed05.png\")
m.
Radius of the each disk is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e137cbf4155b7375bdf7a18c05ea549f.png\")
m.
Cyllindrical disks are joined by the thin solid cylindrical hub of mass ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9d19ef12bb22e743a1566cbc6855e900.png\")
kg.
Total mass of yo-yo is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e94d105883ed2ccda6263d6551296c11.png\")
.
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![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6fedf95e15e3073ba079e754f254e3de.png\")
Law of conservation of energy:
\Gravitational potential energy = Rotational kinetic energy + Linear kinetic energy.
\
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Substitute corresponding values in the the expression
\