1. The problem statement, all variables and given/known data Which of the following is correct? 1. The acceleration of pulley B is g/11 downwards 2. The acc. of pulley C is g/11 upwards 3. Tension in string passing over pulley A is 12.46g N 4. Tension in string passing over pulley A is 10g N 2. Relevant equations F=m.a 3. The attempt at a solution I wrote equations assuming pulley B to go down and pulley C to go up, with going down being positive. Here, T is the tensions in the strings. I think the tension in the string over pulley B and C are equal, that is 'T' here. a' is acceleration of pulley B. a'' is acceleration of pulley C a is acceleration of the weights with respect to pulley. My doubt is, in these equations below, should the RHS accelerations be WRT to ground frame or pulley frame? But here are my equations, though solving them doesnt give me answers matching to any of the options 1. 8g - T = 8(a'-a) 2. T - 6g=6(-a'-a) 3. 10g - T = 10(a''+a) 4. T - 4g = 4(a-a'') Any help would be appreciated.