1. The problem statement, all variables and given/known data http://img70.imageshack.us/img70/3438/physicsquestiondiagram.png [Broken] A man sitting in a cart is attached by a rope of negligible mass that runs over a frictionless pulley. The rope falls in front of the man, so the man tries to pull on the rope in order to pull himself up. The total mass of the man and the cart is 100kg. What force should the man exert on the rope to make himself move up at a constant velocity? 2. Relevant equations F=ma 3. The attempt at a solution I did: Let F be the force of the man pulling, T be the tension of the rope then, F - T = 0 and 100*9.8 - T = 0 so F = 980N but, the solution tells me that, 2T = mg = 100*9.8 T = 490N F = 490N it doesn't make sense to me.. help?