The linear mass density of the chain is `lambda = m/l` . When a length `x` of the chain is overhanging the mass of this overhung part of the chain is

`m_x =x*lambda = m*(x/l)`

The corresponding weight of overhung mass `m_x` is

`G = m_x*g = m*g*(x/l)`

Now the entire chain system can be regarded as a single body with two forces acting on it: `G` (which pulls down the chain) and its inertia `m*a` (which is opposing the movement down of the chain) (here m is the total mass of the chain).

Therefore

`m*a = m*g*(x/l)` and `a =g*(x/l)`

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