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## Homework Statement

A free particle is moving in the x direction through Minkowski spacetime,

and has velocity V as measured by a stationary observer at x = 0; t = 0. Express

the particle's world-line parametrically in terms of V , parametrized by the particle's

proper time

## Homework Equations

unknown

## The Attempt at a Solution

Help I have been stuck on this problem for hours now, and what I keep getting is wrong so idk where to start now please help!