There are two uprights.
All rugby posts have a 3m cross bar and the posts are allowed to be as high as possible.
2p
Rugby field dimensions include the posts - 5.6 metres wide. The top edge of the cross bar is 3.0 metres from the ground. The minimum height of the posts is 3.4 metres.
Nothing they are exactly the same in every way.
From the International Rugby Board's website... 1.4 DIMENSIONS FOR GOAL POSTS AND CROSSBAR(a) The distance between the two goal posts is 5.6 metres.(b) The crossbar is placed between the two goal posts so that its top edge is 3.0 metres from the ground.(c) The minimum height of the goal posts is 3.4 metres.(d) When padding is attached to the goal posts the distance from the goal line to the external edge of the padding must not exceed 300mm.
No its not allowed
About 5.9768mm. There are goal posts that can also double as soccer goals.these ones have triangles just under the crossbar,most commonly found in schools. They make it A LOT easier to deflect the ball off of them. Once, while trying though, the ball got stuck in one of the triangles...silly goals.
under the posts for a kick off.
They are called Goal Posts in both codes
There are no records of this- The height of posts are specific to the IRB regulations
Schools normally start contact sports like rugby at the age of 11