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don't make the mistake of thinking it is (3/4)·V^2 for everything.
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It is (3/4)·V^2 for a cylinder.
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If it's a sphere or something,
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you got to add a different thing.
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But every time you will have to find a moment of inertia,
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you do rotation and add to the energy of the rotation,
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the energy of translation.
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You follow that?
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For each body, you'll have a different moment of inertia.
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So, you've got to use, in the place of (1/2)·m·V^2,
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let me just tell you for a sphere.
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If this was a sphere, not a disk,