Hi 
a lot of people know well classic toy called Rainbow Slinky Spring as in attached photo:
i hope some Guides How can start make this Physics Animation in Real-Time with Unity ?
In physic? On a scale to 10, I would say this is a 9.9 difficulty feature.
is this means impossible with Unity ?
Nothing is impossible. Just depends how many weeks or months you’re ready to spend on this specific feature. 
Hi, Have you made its simulation? i need help for its mechanic.
thanks in advance.