Answer:
900kJ
Explanation:
Work done hereis lifting that water mass on to the surface level
v = volume of the tank
d= density of water (1000kg/m3)
g = gravotational acceleration
workdone=Weight * distance
= (v*d*g)*distance
=[tex]=((\frac{8+4}{2} )*5*10)*1000*10*3\\=900000J\\=900kJ[/tex]