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Homework Statement
The speed of a particle in Earth's frame is 0.4 c. A second particle goes away from the first one with speed 0.6 c. What is the speed of the second particle in Earth's frame?
Homework Equations
u=(u'+v)/(1+u'v/c^2)
The Attempt at a Solution
I think v=0.4 c and u'=-0.6, but as I use the above equation the solution is not 0.8 c(as it is in my book). If I put v=-0.6 and u=0.4 then the solution is 0.8 c. Which one is correct?
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