$1)$"We can solve same PDA with empty stack and using final state"
Can give an example of such language? Where is the difference between solving a pda with empty stak and by accepting final state?
I got this link but without example https://cs.stackexchange.com/questions/66924/push-down-automata-acceptance-by-empty-stack-and-final-state
$2)$If language has prefix property, why it cannot be solved with empty stack?