What's stopping two independent observers from measuring the speed and position at the same time, separately?
26458
Uncertainty principle and multiple observers
47242
Time dilation due to change in speed
114454
Acceleration in special relativity
7149
Calculus of variations -- how does it make sense to vary the position and the velocity independently?
138834
A question about special relativity theory
100959
Is conservation of momentum and energy valid for non-inertial frames?
85007
The "Satellite Paradox": Twin paradox in orbiting satellites
63925
Gravitational time dilation, does time of the observer at a lower gravitational potential looked slowed down in the frame of the higher one
15685
Does slowing light violate relativity?
35663
Is there a formula that gives the position of an object depending on the time, but which doesn't allow the object to surpass the speed of light?
154242
How to synchronize two microcontrollers to micro-second accuracy?
76238
Why is the relative velocity of B with respect to A negative of the relative velocity of A with respect to B?
33571
Is there always a frame in which spatially separated events are simultaneous?
126642
How position of source affects YDSE interference?
122484
Are acceleration and velocity simultaneous?
43343
How to derive addition of velocities without the Lorentz transformation?
147346
Understand the difference between independent and mutually exclusive events