Question 1195923
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The connecting formula you need is:
{{{ E[rot] = (1/2)Iw^2 }}}   I will use w for ω (omega, normally this is used for angular speed), due to problems rendering...

Substituting for I:
{{{ E[rot] = (1/2)(Mr^2)w^2 }}}  
= {{{ (1/2)(0.2kg)(0.5m)^2*(2 rad/s)^2 }}}
= {{{  0.1 }}} {{{kg*m^2/s^2 }}}
= {{{ 0.1  }}}  Joule