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Introductory Physics Homework Help
Work as Change in Kinetic Energy vs Change in PE
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[QUOTE="CWatters, post: 4854449, member: 423469"] What Simon said. A human lifting a book is complicated by the fact that a human can't recover the ke during the deceleration phase. In many other systems that energy can be recovered. Humans are also inefficient and consume energy even when not doing work lifting books. Sometimes best not to use humans in examples because they are so non ideal machines. [/QUOTE]
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Introductory Physics Homework Help
Work as Change in Kinetic Energy vs Change in PE
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