Figure 5-56 shows a box of mass m2 = 1.3 kg on a frictionless plane inclined at angle θ = 34°. It is connected by a cord of negligible mass to a box of mass m1 = 2.7 kg on a horizontal frictionless surface. The pulley is frictionless and massless. (a) If the magnitude of the horizontal force F is 2.5 N, what is the tension in the connecting cord? (b) What is the largest value the magnitude of F may have without the connecting cord becoming slack? so i broke this up into 2 free body diagrams for the first one i got T+2.5 = 2.7a so T = 2.7a-2.5 for the second one T-7.1 = 1.3a so T=1.3a+7.1 putting them together and solving for a i got a = 6.86m/s^2 when i plugged that back to solve to T i got T = 16.0N but its ssaying that 16.0 is wrong, did i do anything wrong? and can i get a hint for part b?