1. The problem statement, all variables and given/known data Two masses m1 and m2 situated on a frictionless, horizontal surface are connected by a light string. A force F is exerted on one of the masses to the right. Determine the acceleration of the system and the tension T in the string. 2. Relevant equations F=ma 3. The attempt at a solution I got a=F/(m1+m2). I think that is right. For the tension part, I got a little bit stuck. I finally got T=m1a because it is just moving m1. So T=Fm1/(m1+m2). Is this right? I don't think it is.