for the first part,
rotational kinetic energy=.5*moment of inertia*(omega^2)
moment of inertia = .5mr^2 because u r dealing with a solid cylinder.
therefore, KE=.5*(.5mr^2)*(omega^2)
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for the first part,
rotational kinetic energy=.5*moment of inertia*(omega^2)
moment of inertia = .5mr^2 because u r dealing with a solid cylinder.
therefore, KE=.5*(.5mr^2)*(omega^2)