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