Nightwing

@my2cts that's fine but as soon as the force has been applied, and the string starts to form the V, the force will be finite but d would tend to zero.

@Conreu I asked the proof about the advantage in force and so the question was closed. So I asked a new question (after proving it myself) which is entirely different and which was again closed as someone thought the question was same. So I edited this question.

I have no idea what you mean here.

The question is why wouldn't the tree collapse in the process.