The maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs = 0.6, g = 10 m s⁻²):
A15 m s⁻¹
B45 m s⁻¹
C90 m s⁻¹
D30 m s⁻¹
Answer & Solution
Correct answer: D. 30 m s⁻¹
On a level road friction provides the centripetal force: v_max = √(μs R g) = √(0.6×150×10) = √900 = 30 m s⁻¹, independent of mass.
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