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Thank you for the answer, I will then ask my professor ehat he meant by that statement. He did, however, only say that for rigid bodies and rigid movement.
I don't understand why it wouldn't work, since this kinetic energy is not dependent on the direction of the velocity, it's a scalar: $W_k = \frac{1}{2}mv^2$. So if the rotational energy remains the same, then all other energies should go into this final kinetic energy. What is wrong with my way of thinking?
