Work & Energy - IB Physics

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This lecture defines energy and explores the relationship between work and energy. The connection between them is extremely important because all our equations for energy are based on the object's ability to do work. In the lecture I define energy and then do some example problems with work. Part of a series on energy for IB physics 1.
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4:13, If energy is the ability to do work, how is it that final energy is greater than initial energy? You said that the object loses energy as more work is being done.

Wouldn't it be Ef = 580J - 500j = 80J?

joshcha