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the device that is aman using is a circular shaped and the given part is that the aman had completed 20revolutions that means 20 round the device and he comes to the stationery or the starting point after each revolution counting to 20 thus the displacement of the device from the starting point is 0 then the work done is also 0
because
w=f×s. (let the force be x)
w=x×o
w=0
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