It would go to a 'Kicking Cometition' (place kicks). Much like a penalty shoot out in football. It is not very fair as you could end up with a prop taking a kick to win.
RWC Rules 2011 says -
Kicking Competition
If at the end of a knockout match, after extra time and sudden death periods of play have been completed, the teams remain tied, then the Referee will conduct a place-kick competition to determine the winner of the match.
The following procedures apply:
The five Players from each team will place kick from three different areas, all on the 22 metre line, as follows:
The Referee will start the competition by calling the first Player selected from the team kicking first to the first kicking point. Once the Player has taken the kick, the Referee calls a Player from the opposing team to kick from the same area.
The next two Players (one from each team) will kick from the second area in turn. This will continue until all five Players from each team have kicked (the next Players kicking respectively from the third area, first area and finally the second area), or until one team is unable to equal the score of the other team within the remaining number of kicks.
If there is an equal number of successful kicks once each team has completed its five kicks, the competition continues on a "sudden death" basis, following the same order of kickers used in the first five kicks.
The competition will continue two kicks at a time (one from each team), going progressively through the three kicking areas stated above (and repeating the process if necessary) until one Player succeeds with a kick and the Player from the other side taking the same kick misses it. Once this occurs, the team of the Player who succeeded with the kick will be declared the winner.
Throughout the kicking competition:
New Zealand beat Australia in the final to win the 2008 Rugby League World Cup.
The 1991 Rugby World Cup final was held at Twickenham Stadium, in London, England.
The 1991 Rugby World Cup final was held at Twickenham Stadium, in London, England.
No
They won the FIFA World Cup in 1998, but have never won the Rugby World Cup, though they did lose the final in 1987 and 1999.
South Africa defeated New Zealand, 15-12, to win the 1995 Rugby World Cup.
Australia defeated New Zealand 34-2 in the Rugby League World Cup grand final of 2013.
the new zealnd all blacks won the 1987 rugby world cup. they played france in the final and won 29-9
New Zealand won the first ever rugby world cup beating France in the final
Jonny Wilkinson
david kirk
England 20 - 17 Australia