If we stop in case of و after Dammah,  ي  after Kasrah then voice will be prolonged for one alif.

هٰرُوْنَ اَخِي O

وَلَا تُخْسِرُوا O

  يٰقَوْمِ  اتَّبِعُوا O

 

 

 

 

Note- if و comes at the end of a verb than an extra ا comes where no pronoun attached with the verb.