Let me explain the picture just to make sure. Object with mass 2 kg is being pulled with a force of F = 14.4 N. The whole system has an acceleration of a = 2.8 m/s^2. The friction coefficient between the objects and the ground is k = 0.2 What is the tension in the rope? So the question is simple I believe but I can't understand the concept of tension in the rope (red line). Also if it helps I have a solution for the problem, it says that the tension is 4.8 N. Can someone please elaborate this? Thank you!