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Quick check from College Physics, 10.6 Collisions of Extended Bodies in Two Dimensions
Is rotational kinetic energy a vector? Justify your answer.
Answer it in your own words before you look.
No, energy is always scalar whether motion is involved or not. No form of energy has a direction in space and you can see that rotational kinetic energy does not depend on the direction of motion just as linear kinetic energy is independent of the direction of motion.
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