A=F*SF=m*gm=p*VV=S*lV=7m*0.0072m^2=0.0504m^3m=0.0504m^3*7 800 kg/m^3=393.12kgF=393.12kg*10 m/s^2=3931.2HA=3931.2H*60m=235 872Дж
м=PV=7800•0,0504=393,12кг
А=mgh=393,12•10•60=235872Дж
A=F*S
F=m*g
m=p*V
V=S*l
V=7m*0.0072m^2=0.0504m^3
m=0.0504m^3*7 800 kg/m^3=393.12kg
F=393.12kg*10 m/s^2=3931.2H
A=3931.2H*60m=235 872Дж