Question

For a coordinate system within a uniform gravitational field whose acceleration due to gravity is g = 0.1 ly/y², one event occurs at the origin (t=0) and another event occurs 4 years later. For this time interval, how much proper time elapses for an observer that is, according to an observer at the origin,

a) moving along + x axis with a velocity ov v=0.6c?

b) stationary at the location x = 2 ly?

c) are either of these observers inertial (Minkowski) observers?

Answer 1