Okay, so I was now confused too and checked the problem statement again. Turns out, they changed the problem statement about an hour ago, now stating the acceleration a' in the ships frame of reference is: a'=30 m/s^2. This seems to me like a large enough acceleration to cause some time...
Yes, that is all the information given. I am assuming that they travel at relativistic speeds, since our problem sets for the last 2 weeks were on this topic, and the course is a 2nd year theoretical physics class, so I think the non-relativistic case would be silly to ask for. (Yes, the problem...
A spaceship leaves earth. One twin stays back, the other is on the ship. The ship accelerates for 5 years with a constant acceleration (the 5 years are in the reference frame of the ship), then it decelerates for 5 years. Then, it turns around and does the same thing again. All the accelerations...