Q. What will be the maximum speed of a car on a road-turn of radius 30m if the coefficient of friction between the tyres and the road is 0.4?
A) ${10.84\ ms}^{- 1}$
B) ${9.84\ ms}^{- 1}$
C) ${8.84\ ms}^{- 1}$
D) ${6.84\ ms}^{- 1}$
Explanation
(a) $Maximum\ speed\ v = \sqrt{\mu rg} = \sqrt{0.4 \times 30 \times 9.8} = 10.84{ms}^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.