1. The problem statement, all variables and given/known G=8400N h=35m d=10m g=10m/s^2 A crane elevate a box with G=8400N at h=35. After this, the box is moved horizontal on distance 10m. No friction. Work = ? ps. Sorry for bad English. 2. Relevant equations I think that W=W1 ( work on elevating ) + W2 ( work on moving ). W1=F1*h and W2=F2*d In the first I must tu find F1. F=F1-G ==> F1=G-F=G-ma Now, F2: F=F2==> F2=m*a. W=F1+F2=G-ma+m*a. But I don't know a... 3. The attempt at a solution I know I am bad but I want to learn. What can I do to solve this exercice ? Thank you very much !