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An observer in frame S′ is moving to the right (+ x-direction) at speed u =...

An observer in frame S′ is moving to the right (+ x-direction) at speed

u = 0.650 c away from a stationary observer in frame S. The observer in S′ measures the speed v′ of a particle moving to the right away from her.
a)What speed v does the observer in S measure for the particle if v′= 0.430 c ?
b)What speed v does the observer in S measure for the particle if v′= 0.870 c ?
c)What speed v does the observer in S measure for the particle if v′= 0.990 c ?
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