- #1
MostlyHarmless
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Homework Statement
(Verbatim) A particle moves with speed .9c along the x'' axis of frame S'', which moves with speed .9c in the positive x'-direction relative to frame S'. Frame S' moves with speed .9c, in the positive x-direction, relative to S. a.) Find the speed of the particle relative to S', and b.) S''.
Homework Equations
Relativistic Velocity Transform: $$u'_x= \frac{u_x-v}{1-\frac{vu_x}{c^2}}$$
The Attempt at a Solution
My question is more or less just about the interpretation of the question.
The first line, does that mean, the particle's rest frame is S''? Or that the particle is at rest in S'' which is moving at .9c?