A 1-kg block is lifted vertically 1m by a boy. The work done by the boy would be one jule or would no work be done. I'm confused, I thought lifting wasn't considered work.

The work done is actually about 9.81 joules. Think of gravity pulling on the block as an invisible string connecting the block to the Earth. If you lift the block you store energy in the gravitational field (you "strech the string" a bit more) which you can release by dropping the block.

You are correct, Count.

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asked by susane
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    posted by abed

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