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 is
A) 0, 0
B) 0,10 $ms^{- 1}$
C) 10$\ ms^{- 1},10ms^{- 1}$
D) 10$\ ms^{- 1},0$
Explanation
(b) Here, $r = 100\ m,t = 62.8$ s
In one circular loop, displacement = 0
$\therefore\ \ $Velocity=0
Distance traveled =2$\pi r$
$\therefore$ Speed $= \frac{2\pi r}{t} = \frac{2.14 \times 100}{62.8} = 10\ ms^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.