1. The problem statement, all variables and given/known data Two masses are suspended by a frictionless string on a frictionless pulley, one with mass 75 kg and the other 100 kg. What is the tension of the string and the acceleration of the masses 3. The attempt at a solution My attempt was to say since mass A, 75 kg, was 75 percent of mass B, then the acceleration of mass B would be 25 percent of the acceleration of gravity 9.8 m/s^2. so it would be roughly 2.5 m/s^2. Since the acceleration was 2.5 m/s^2, I thought the tension would be equivelant to the force of the mass of both A and B times the acceleration 2.5 m/s^2 ie. F=ma. Clearly there is something wrong with this approach. What is it that I'm missing? is there a generalized formula for tension of a string?