\begin{align} \text{Per a calcular el treball hem de} :&\cssId{Step1}{W =E_{p}}\\[3px] &\cssId{Step2}{E_{p} = mgh}\\[3px] &\cssId{Step3}{m = \rho v}\\[3px] &\cssId{Step4}{E_{p}=\rho vmg }\\[3px] &\cssId{Step5}{E_{p} =45 600*9,807*10,4}\\[3px] &\cssId{Step6}{E_{p} = 4,651MJ}\\[3px] \end{align}