For a solid sphere, Kt/Kr =5/2 (see [http://cnx.org/content/m14391/latest/ Work and energy in rolling motion])
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For a solid sphere, Kt/Kr =5/2 (see [http://cnx.org/content/m14391/latest/ Work and energy in rolling motion] or [http://en.wikipedia.org/wiki/List_of_moments_of_inertia Wikipedia])