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# The radius of a well is 7m. Water in it is at a depth of 20m and depth of water column is 10m. Work done in pumping out water completely from the well is, (g=10ms−2).

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#### Total mass of water =mm= density ×volume=1000×πR2(h)=1000×227×72×10=1540000kgBy using center of mass concept ,center of mass of water is at depth of (20+5)h from the top.Hence work done =mg(20+5)=150000×10×25=385000000J=385000KJ

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