1. The problem statement, all variables and given/known data Determine the initial acceleration of the 15-kg block if (a) T = 23 N and (b) T = 26N. The system is initially at rest with no slack in the cable, and the mass and friction of the pulleys are negligible. I have attached a picture of the problem. 3. The attempt at a solution a) I know, that there is a normal force, that I need to find. I do that by setting the sum of forces in y-direction = 0 0=m*T*cos(30)+N then I get N=0 ? I don't think that is correct. B) I don't know how to solve this part either.