1. The problem statement, all variables and given/known data See attached picture please. It is supposed to be a pully system with 100N being applied upwards and i need to prove the values given in the diagram i drew and my teacher gave me it as a question to do since we have finished the scottish higher course. 2. Relevant equations Obviously it is using Fun=m * a but i am thrown off by the idea of the 100 N force upwords. 3. The attempt at a solution My whole class was revising for exams etc and my teacher gave me this question to see if i could do it. In the 50 minute period i was really confuzed and had no idea how to do it and it is really irritating me. I obviously know that the unbalanced force on the 5kg mass must be 1N to produce that acceleration and the unbalanced force on the 2kg mass must be 30.4N. But i have no idea how to prove it ?