Pulse in a string 

I'm stuck on this question. I know there is a reflection wave on the soft boundary (the ring) and it's not inverted and there is no phase change either. 

  • This is hand-written question, I think there is still some information giving, even variables are not defined.

  • Information missing*

  • This question is vague. Does the motion satisfy the wave equation and the wave looks like the given picture at certain time?