A student uses a force of 45 Newtons to push a chair at a constant speed of 3m/s for a time of 6 seconds how much work did the student do?

A student uses a force of 45 Newtons to push a chair at a constant speed of 3m/s for a time of 6 seconds how much work did the student do?
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Answer :

W = F*dd = 3m/s * 6s = 18mW = 45N18m = 810Nm
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