The coefficient of friction between the tyres and the road is $0.25$. The maximum speed with which a car can be driven round a curve of radius $40 \,m$ without skidding is ........ $ms^{-1}$ (assume $g = 10 \,ms^{-2}$)
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(d)$v = \sqrt {\mu rg} = \sqrt {0.25 \times 40 \times 10} = 10\,m/s$
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