1. The problem statement, all variables and given/known data A light spring passing over a smooth pulley carries a spring balance of mass 1 kg and two weights of masses 1 kg and 2 kg. the reading on the balance will be 2. Relevant equations 3. The attempt at a solution to my knowledge whatever the tension above the spring balance the reading will not change, it is only affected by the reading below it. Therefore I considered reading = weight of spring balance + 1N Reading = 20N But I'm not sure whether this is the right approach. Should the mass of spring be considered? Or will there be some sort of acceleration taking place? Thank you.