Q. A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively is
A) 0,0
B) $0,\ {10\ ms}^{- 1}$
C) ${10\ ms}^{- 1},\ {10\ ms}^{- 1}$
D) ${10\ ms}^{- 1},\ 0$
Explanation
(b) On a circular path in completing one turn, the distance traveled is $2\pi r$ while displacement is zero.
$Hence,\ \ \ \ average\ velocity = \frac{displacement}{time\ interval} = \frac{0}{t} = 0$
$Average\ speed = \frac{distance\ }{time\ interval}$
$= \frac{2\pi r}{t} = \frac{2 \times 3.14 \times 100}{62.8} = 10{\ ms}^{- 1}\ $
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.