Q. A motor car has a width $1.1\ m$ between wheels. Its centre of gravity is $0.62\ m$ above the ground and the coefficient of friction between the wheels and the road is 0.8. What is the maximum possible speed, if the centre of gravity inscribes a circle of radius $15\ m$? (Road surface is horizontal)
A) $7.64\ m/s$
B) $6.28\ m/s$
C) $10.84\ m/s$
D) $11.23\ m/s$
Explanation
(c) $v = \sqrt{\mu\ g\ r} = \sqrt{0.8 \times 9.8 \times 15} = 10.84\ m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.