A $100 \,kg$ car is moving with a maximum velocity of $9 \,m/s$ across a circular track of radius $30\,m$. The maximum force of friction between the road and the car is ........ $N$
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(c) Maximum force of friction = centripetal force
$\frac{{m{v^2}}}{r} = \frac{{100 \times {{(9)}^2}}}{{30}} = 270\,N$
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