I'm in frame S, and you are in is in Frame S′, which moves with speed V in the +x direction.
An object moves in the S′ frame in the +x direction with speed v′x. Do I measure its x component of velocity to be vx=v′x?
I'm in frame S, and you are in is in Frame S′, which moves with speed V in the +x direction.
An object moves in the S′ frame in the +y direction with speed v′y. Do I measure its y component of velocity to be vy=v′y?
With Einstein's velocity addition rule,
u=u′+v1+u′vc2
what happens when v is very small compared to c?
With Einstein's velocity addition rule,
u=u′+v1+u′vc2
what happens when u′ is c?
With Einstein's velocity addition rule,
u=u′+v1+u′vc2
what happens when v is c?