Answer
$u=0.21c$
Work Step by Step
The formula for relativistic speed is:
$u=\frac{u^{\prime}+v}{1+\frac{u^{\prime}v}{c^2}}$
We plug in the known values to obtain:
$u=\frac{-0.47c+0.62c}{1+\frac{-0.47c\times 0.62c}{c^2}}$
$u=0.21c$
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