1. The problem statement, all variables and given/known data A boy and girl are standing on ice skates and pulling on opposite ends of a rope. Find their velocities the instant they meet. How long did it take? Relative speed of approach is 2 m/s mass of boy = 60kg mass of girl = 50kg distance = 5m 2. Relevant equations m1v1 + m2v2 = (m1+m2)v v1 & m1 = boy v2 & m2 = girl 3. The attempt at a solution I know that it takes them 2.5 seconds to meet (t = d/v). I cannot figure out their individual final velocities. v1+v2 = v_rel v2 = v_rel - v1 m1(v_rel - v1) + m2v2 = (m1+m2)v But this leaves me with 2 equations, three unknowns.