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 April 24th, 2017, 11:05 AM #1 Senior Member   Joined: Dec 2015 From: Earth Posts: 223 Thanks: 26 Help ! A sphere rolls(moves) or walks with ENERGY E=45 J With inertia $\displaystyle I=\frac{2}{5} m r^{2}$ Find the velocity of spehere v=? sphere moves in a plane Last edited by idontknow; April 24th, 2017 at 11:10 AM.
 April 24th, 2017, 11:15 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,856 Thanks: 964 $K = \dfrac 1 2 I \omega^2$ $v = \omega r$ you should be able to finish.
 April 24th, 2017, 12:30 PM #3 Math Team   Joined: Jul 2011 From: Texas Posts: 2,737 Thanks: 1387 A sphere that rolls without slipping has both rotational and translational kinetic energy ... $\dfrac{1}{2} I \omega^2 + \dfrac{1}{2} mv^2 = 45 \, J$

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