The maximum speed with which a car can be driven round a curve of radius 18 m without skidding (when g=10ms−2 and the coefficient of friction between rubber tyres and the roadway is 0.2) is:
A
36.0 kmph
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B
18.0 kmph
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C
21.6 kmph
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D
14.4 kmph
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Solution
The correct option is C21.6 kmph R=18m , μ=0.2 V2=μgR V=√(0.2)(18)(10) =6m/s V=6×185km/h = 21.6km/h