1. The problem statement, all variables and given/known data An object 1 of mass 5 kg is attached to object 2 of mass 7 kg with a string. The 5 kg object is pulled up with a 67 N force - what is the tension in the string. 2. Relevant equations F= ma 3. The attempt at a solution Since object 1 has an external force of 67 N acting upon it, that force should be subtracted by the weight of object 1: (5)(9.8) = 49 N 67 - 49 = 18 N Object 2 just has its weight force acting upon it: (7)(9.8) = 68.6 N I've calculated the forces acting on the objects - but I'm not sure how to calculate tension from here.