Question

The minimum velocity (in m/s) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is:

• A. 60 m/s
• B. 30 m/s
• C. 15 m/s
• D. 25 m/s

Answer 1

The correct option is B 30 m/s

Given that the car avoid skidding

$\Rightarrow \frac{m{v}^2}{r}=\mu mg$

Here $\mu$ is frictional coefficient , $v$ is minimum speed to avoid skidding and $r$ is radius

$\Rightarrow V^2=\mu rg=0.6\times 150\times 10=900$

$\Rightarrow v=30$

therefore option $B$ is correct