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So far I'm thinking that intial potential energy = final kinetic energy, so

mgh = K, where h = 0.5 m (the center of mass)

I can't seem to use K = 1/2 * I

_{cm}* w

^{2}+ 1/2 * M * v

_{cm}

^{2}

because I don't know v

_{cm}... or can I find it?