$(a)\;12.4 \;m/s\qquad(b)\;6.2\; m/s\qquad(c)\;3.1\; m/s\qquad(d)\;None\;of\;these$

Want to ask us a question? Click here

Browse Questions

Ad |

0 votes

0 votes

Answer : (b) $\;6.2 \;m/s$

Explanation :

$\bigtriangleup P\;.E=\large\frac{-2\times9\times10^{9}\times2\times4\times10^{-12}}{3} + \large\frac{2\times9\times10^9\times2\times4\times10^{-12}}{5}$

$\bigtriangleup P\;E=\large\frac{-144\times10^{-3}\times2}{3\times5}=\large\frac{-96\times10^{-3}}{5}$

Using conservation of total energy as their is no external force

$\bigtriangleup T\;.E=0$

$\bigtriangleup K\;.E + \bigtriangleup P\;.E=0$

$\large\frac{1}{2}\times1\times10^{-3}\times v^2=\large\frac{96\times10^{-3}}{5}$

$v=6.2\;m/s\;.$

Ask Question

Take Test

x

JEE MAIN, CBSE, AIPMT Mobile and Tablet App

The ultimate mobile app to help you crack your examinations

...