Trust me, I've paid a lot of attention in class and read what text we have. If I use impulse, I can prove that Fa = Fb. This generates an answer, however, the fact that Fa = Fb contradicts the problem. Another approach would be to find the difference in the two forces Fa - Fb. Set that to...
two astronauts initially at rest in free space, pull on either end of a rope. Astronaut Alex played football in high school and is stronger than astronaut Bob, whose hobby was chess. The maximum force with which Alex can pull, Fa, is larger than the maximum force with which Bob can pull, Fb...