X: observer is inside the spaceship, spaceship is accelerating Y: observer is inside the spaceship, spaceship is traveling at a constant velocity Z: observer is inside the spaceship, spaceship is at rest on the ground
B
X: observer is on the ground, spaceship is at rest on the ground Y: observer is inside the spaceship, spaceship is traveling at a constant velocity Z: observer is on the ground, spaceship is traveling at a constant velocity
C
X: observer is inside the spaceship, spaceship is traveling at a constant velocity Y: observer is inside the spaceship, spaceship is accelerating Z: observer is inside the spaceship, spaceship is at rest on the ground
D
X: observer is on the ground, spaceship is traveling at a constant velocity Y: observer is inside the spaceship, spaceship is accelerating Z: observer is on the ground, spaceship is traveling at a constant velocity