A motorcyclist of mass m is to negotiate a curve of radius r with a speed v. The minimum value of the coefficient of friction so that this negotiation may take place safely, is
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(b) $f_{r}=\frac{mv^2}{r}$
$f_{r}=\mu_{N}$
$=\mu m g$
$\mu{m g}=\frac{m v^{2}}{r} \quad \mu=\frac{v^{2}}{gv}$
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