Can somebody briefly explain me the tension of the string, and has it any relation to any of the newton s laws?

Explanation:

I'll give it a go.

In simpler cases, tensions in strings are typically caused by some weight attached to the end of them. You could use Newton's 3rd Law to describe this phenomenon.

So because the weight is pulling on the rope with a force, an equal and opposite force is enacted throughout the rope. That equal and opposite force is what we call "tension".

*Note that if the weight of the rope is negligible, or you are ignoring it for a specific problem, then the tension is the same throughout the rope. In more complicated cases, the rope does have weight. In these cases the tension changes at different lengths of rope.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.