A car is moving on a horizontal circular road of radius $0.1 \,km$ with constant speed. If coefficient of friction between tyres of car and road is $0.4$, then speed of car may be ......... $m / s$ $\left(g=10 \,m / s ^2\right)$
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(d)
Maximum speed for the circular road
$\frac{v_{\text {maximum }}^2}{r}=\mu g$
$V_{\text {maximum }}=\sqrt{\mu r g}$
$=\sqrt{0.4 \times 100 \times 10}=\sqrt{400}=20 \,m / s$
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