Answer to Question #100379 in Field Theory for Derickson

Question #100379
The power required to lift a certain body through a distance of 30m in 6 seconds is 200 watts. Calculate workdone and mass of the body.
1
Expert's answer
2019-12-13T09:53:03-0500
workdone=power×time\rm work\: done=power\times timeW=Pt=200W×6s=1200JW=Pt=200\:\rm W\times 6 \:s=1200\: J

Also we have


W=mghW=mgh

So, the mass of the body

m=Wgh=1200J10N/kg×30m=4kgm=\frac{W}{gh}=\frac{1200\:\rm J}{10\rm N/kg\times 30\: m}=4\: \rm kg


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