Introduction to Classical Mechanics · Problem 11.25
Relativity (Kinematics) — Morin
Physics — Mechanics · acceleration-and-redshift
Problem
Use a Minkowski diagram to solve the following problem: Two people stand a distance d apart. They simultaneously start accelerating in the same direction (along the line between them) with the same proper acceleration a. At the instant they start to move, how fast does each person's clock tick in the (changing) frame of the other person?