a weight lifter lifts the weight against the force of gravity.so the weightlifter does work.

pls look this up in the video:

minute 00:20 to 00:24

thank you

 

In this case we are talking about the situation when the weight lifter is just holding the weight. While just holding the weight on his hand for some time, he is not doing any work because the displacement of the weight is zero. 

 And we know that work done zero when the displacement is zero is zero. 

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