Q. A body has speed of V,2V and 3V in first $1/3$ of distance $S,$ seconds $1/3$ of $S$ and third $1/3$ of $S$ respectively. Its average speed will be
A) $V$
B) $2V$
C) $\frac{18}{11}V$
D) $\frac{11}{18}V$
Explanation
(c) $v = \frac{Total\ distance}{Time\ taken} = \frac{x}{\frac{x/3}{v} + \frac{x/3}{3v} + \frac{x/3}{2v} + \frac{18}{11}v}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.