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