Q 11-04-042NEETJEE MainEasy
The coefficient of static friction between the tyres and a flat road is $0.4$. The maximum speed with which a car can go round a flat curve of radius $40$ m without skidding is ($g = 10\ \text{m/s}^2$)
Answer: (C) $4\sqrt{10}$ m/s
Concept. Flat curve: $v_{\max} = \sqrt{\mu rg}$.
Step 1. Substitute. $\sqrt{160} = 4\sqrt{10}$ m/s.
Answer. $4\sqrt{10}$ m/s (Option C).
Solution by Sreeraj P, M.Sc Physics