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UPSC Civil Service Exam Questions

Q1: Brake is applied on a vehicle which then skids a distance of 16 m before coming to stop. If the developed average coefficient of friction between the tyres and the pavement is 0.4, then the speed of the vehicle before skidding would have been nearly

A 20 kmph

B 30 kmph

C 40 kmph

D 50 kmph

ANS:C - 40 kmph

Sb = v^2/2gf.

V = √sb * 2gf,
V = √16 * 2 * 0.4 * 9.8.
V = 11.2 m/s,
V = 11.2 * 3.6 km/hr.
V = 40 km/hr (Approx).



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