A car turns a corner on a slippery road at a canstant speed of `12m//s` . If the co0efficient is `0.4` , the minimum radius of the arc in metres in which the car truns is.

Options

A. 72
B. 36
C. 18
D. 9

Answer

B

Explanation

`F=mu(mg)`
Centripetal force `F=mv^(2)//r`
:. `mumg=(mv^(2)//r)` or `r=v^(2)//mug`
or `r=((12)^(2))/(0.4xx10)=36m` .