1. The problem statement, all variables and given/known data two objects are at rest in an inertial reference frame. Two objects accelerate simultaneously in the same direction until reaching half the velocity of light and then halt simultaneously. The two objects are initially connected by a thread just long enough to cover the distance between the two objects. The question is what will happen to the thread due to relativistic length contraction. Draw a Minkowski diagram of the world lines of both objects. 2. Relevant equations f is intertial reference frame. t=0 is initial state rest, T is ending rest state. 3. The attempt at a solution I uploaded a really poor sketch of what I think would occur. The thread would remain intact because of reaching half the velocity of light wouldn't curve space time or force the two objects to seperate enough. I am taking a "philosophy of scientific thought" course and am a bit in over my head right now. Any help would be greatly appreciated. Also, apologize if this version of the subject matter isn't part of this forums content. Thanks.