Physics, 27.10.2019 09:43 kekoanabor19
You're in the gym lifting weights up and down above your head. when are you doing (positive) work on the weights? (a) when you hold them still but not when you raise them up or lower them down. (b) when you raise them up but not when you hold them still or lower them down. (c) when you raise them up or lower them down but not when you hold them still. (d) when you lower them down but not when you hold them still or raise them up.
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You're in the gym lifting weights up and down above your head. when are you doing (positive) work on...
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