| 11. | Suppose, for example, we used gravitational potential energy for everything.
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| 12. | In these cases, the gravitational potential energy is given by
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| 13. | Perhaps half the power goes into kinetic energy, and half goes into gravitational potential energy.
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| 14. | If both start from the same height then they have the same gravitational potential energy.
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| 15. | Gravitational potential energy has a number of practical uses, notably the generation of pumped-storage hydroelectricity.
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| 16. | :The photon appears to be gaining gravitational potential energy.
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| 17. | When an object with mass is placed high above the ground, it has gravitational potential energy.
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| 18. | Gravitational potential energy of A is always negative.
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| 19. | This is a result of stored gravitational potential energy seeking a path of release over friction.
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| 20. | Instead, they are powered only by the gravitational potential energy released as material falls onto them.
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