Laws of Motion Part 1

A uniform metal chain of mass m and length 'L' passes over a massless and frictionless pulley. It is released from rest with a part of its length 'l' is hanging on one side and rest of its length ' L−l ' is hanging on the other side of the pully. At a certain point of time, when l=‌

L

x

, the acceleration of the chain is ‌

g

2

. The value of x is ________.