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Earlier discussion
2 older comments kept for context.
Ekene Ozoma
Explanation
F = r/2and v = my
I/r/2=1/v+1/u
2/r=1/v+1/u
Multioly through by v
2v/r=1+v/u
2v/r-1=v/u
Since, v/u=m
Therefore, 2v/r-1=m
So, B is the rightvl answer
Oluwaseun Adeyemi
F = \(\frac{r}{2}\) and v = mu
F = \(\frac{UV}{U + V}\)
\(\frac{r}{2}\) = \(\frac{U \times mu}{U + mu}\)
\(\frac{r}{2}\) = \(\frac{mu^2}{V(1 + m)}\)
m = \(\frac{2u}{r}\) - 1