Tension in the string holding a falling chain

[Vibhor]

I'm afraid I don't follow your argument.

Now ,even I don't follow my argument

The remarkable thing is that ,despite getting the dynamics of the problem wrong in every step ,I got the correct answer in first try .

 

[TSny]

The remarkable thing is that ,despite getting the dynamics of the problem wrong in every step ,I got the correct answer in first try .

That's happened to me before, too.

 

[Vibhor]

That's happened to me before, too.

Thanks a lot Sir .

Thank you very much @haruspex .