\[\begin {array} {1 1} (a)\;\frac{2}{3} & \quad (b)\; \frac{1}{2} \\ (c)\;\frac{1}{3} & \quad (d)\;\sqrt {\frac{2}{3}} \end {array}\]

Want to ask us a question? Click here

Browse Questions

Ad |

0 votes

0 votes

By symmetry both the billiard balls will move with the same velocity along their respectively lines of impact .

By momentum conservation along the line of impact.

$mu= 2 mv \cos 30$

$\qquad= 2 mv . \large\frac{\sqrt 3}{2}$

$u= \sqrt 3 v$

Newton's law of restitution along line of impact.

$\large\frac{V-0}{0- u \cos 30}$$=-e$

$\large\frac{V}{\sqrt 3 u/2}$$=e$

$e= \large\frac{2}{3}$

Ask Question

Take Test

x

JEE MAIN, CBSE, AIPMT Mobile and Tablet App

The ultimate mobile app to help you crack your examinations

...