Question

What is the minimum stopping distance for a vehicle of mass m moving with speed $v$ level road. If the coefficient of friction between the tyres and the road is $\mu$.

• A. $\frac{v^2}{2\mu g}$
• B. $\frac{2v^2}{\mu g}$
• C. $\frac{v^2}{\mu g}$
• D. none of these

Answer 1

The correct option is A $\frac{v^2}{2\mu g}$

The deceleration due to friction is $\mu g$.
$s=v^2/2a\Rightarrow s=\frac{v^2}{2\mu g}$