Question

If a vehicle travelling at 40 kmph was stopped within 1.8 sec after the application of the brakes, then the average skid resistance coefficient is

Answer 1

Data given, u = 40 kmph,
V = 0, t = 1.8 sec,
$\therefore V=u-at$
$u=at$
$a=\frac{u}{t}=\frac{40\times 5/18}{1.8}$
$=6.1728m/se{c}^2$
$\Rightarrow \text{Avg. skid resistance,}$
$\mu =\frac{6.1728}{9.81}=0.6292$
$\mu \simeq 0.63$