Q. The speed limit of a car over a roadways bridge in the form of a vertical arc is $9.8\ ms^{- 1}$. The diameter of the are is
A) 19.6 m
B) 9.8 m
C) 39.2 m
D) 4.9 m
Explanation
(a) $v = \sqrt{rg}$
$2r = \frac{2v^{2}}{g} = \frac{2 \times 9.8 \times 9.8}{9.8} = 19.6$ m
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.