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OpenStudy (anonymous):
The kinetic energy (KE) of a ball the moment it hits the ground when dropped from a height above the ground is exactly equal to the potential energy (PE) of the ball when it was released. Which is true about this closed physical system? a. It obeys the second law of thermodynamics. b. It obeys the first law of thermodynamics. c. It obeys the law of conservation of energy.
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