A body has speed V, 2,V and 3,V in first 1/3 of distance S , second 1/3 of S and third 1/3 of S

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2.Motion in Straight Line

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A body has speed $V, 2\,V$ and $3\,V$ in first $1/3$ of distance $S$, second $1/3$ of $S$ and third $1/3$ of $S$ respectively. Its average speed will be :-

A

$V$

B

$2\,V$

C

$\frac{18}{11}\,V$

D

$\frac{11}{18}\,V$

Solution

$\Rightarrow V_{a v}=\frac{S}{\frac{S / 3}{v}+\frac{S / 3}{2 v}+\frac{S / 3}{3 v}}$

$\mathrm{V}_{\mathrm{av}}=\frac{18 \mathrm{V}}{11}$

Standard 11

Physics

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