[SOLVED] Tension in a pulley cord I'm having problems trying to solve a tension problem. It's very simple... and I don't know what I'm doing wrong. A light, inextensible cord passes over a light, frictionless pulley with a radius of 15 cm. It has a(n) 22 kg mass on the left and a(n) 2.8 kg mass on the right, both hanging freely. Initially their center of masses are a vertical distance 2.6 m apart. The 2.8 kg block is the lower one. The acceleration of gravity is 9.8 m/s2 The first question was at what rate are the two masses accelerating when they pass each other? I figured this one out and it was 7.5891 m/s2 and I got it right. I didn't have trouble at all figuring that one out because acceleration is constant, but then... It asks... What is the tension in the cord when they pass each other? I don't think that it matters when the tension is calculated, because it's still going to have the same amount of force being applied to it. I tried the sum of their forces (due to gravity), the differences of their forces, zero, and the sum of their forces divided by two... but none of them were right. Can anyone help me out on this one?