energy is the amount of work done on something without respect to time. it is, for example, saying that the book moved 6 inches... that required energy to move the book; however once it is defined with time, "the book moved 6 inches in 2 seconds" is power (the amount of work done with respect to time). energy can be defined in SEVERAL units. ex: Lb*ft calorie Newton*Meters (also called joules)
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