Answer:
Volume \[(v)=20\,\,litres=20\times {{10}^{-3}}{{m}^{3}}\] \[(\because 1\,\,litre={{10}^{-3}}m)\] \[g=10\,\,m/s\] \[h=6m\] \[d=1000\,kg/{{m}^{3}}\] \[(\because \,1g/cc=1000\,kg/{{m}^{3}})\] \[W=?\] \[W=mgh=vdgh\] \[=20\times {{10}^{-3}}\times 1000\times 10\times 6\] \[=1200\,J\]
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