1. The problem statement, all variables and given/known data A 35kg boy is swinging on a rope 7 m long. He passes through the lowest position with a speed of 3 m/sec. What is the tension in the rope at that moment? 2. Relevant equations F=ma F=(m*v^2)/R v=(2pi*r)/T 3. The attempt at a solution F=(35*3^2)/7=45N The correct answer is supposed to be 388 though.