A particle travelling horizontally with speed u collides and sticks with a particle of equal mass hanging at rest at the end of a light enextensible string of length 2l. If thestring rotates through an angle of 60^(@) before its velocity becomes zero, then u is

A particle travelling horizontally with speed u collides and sticks wi

1.	A particle travelling horizontally with speed u collides and sticks with a particle of equal mass hanging at rest at the end of a light enextensible string of length 2l. If thestring rotates through an angle of 60^(@) before its velocity becomes zero, then u is
Answer» `sqrt(4GL)` `sqrt(8gl)` `sqrt(2gl)` `sqrt(GL)` ANSWER :B