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Height=h=20m
Mass=m=7.9kg
[tex]\\ \rm\longmapsto P.E=mgh[/tex]
[tex]\\ \rm\longmapsto P.E=20(10)(7.9)[/tex]
[tex]\\ \rm\longmapsto P.E=20(79)[/tex]
[tex]\\ \rm\longmapsto P.E=1580J[/tex]