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Unformatted text preview: 3. Potential energy is given what symbol? U 4. Write the equation for Kinetic energy: K = ½ mv 2 5. The sum of what two energies is always constant? kinetic and potential 6. What did James Joule discover? The law of the conservation of energy 7. With what unit are work and energy measured? Joules 8. What happens to all the used up energy on earth? Ends up as useless heat in the environment....
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