1. The problem statement, all variables and given/known data Two blocks of masses 2kg (a) and 3kg (b) rest on a smooth horizontal surface and are connected by a taut string of negligible mass. A force of 10 N is applied to the 3kg mass as shown in figure (below). Calculate the tension in the string between them. The answer is 4N http://www.noosahill09.com/images/upload1.jpg [Broken] 2. Relevant equations Friction has not been discussed yet, it is in the next chapter. 3. The attempt at a solution I can figure out how to calculate the tension on a string of a pulley or the tension of a string with a hanging object attached... but because there is no gravity to work out I dont know how to calculate this? Any help is appreciated!!!