Final answer:
Several factors such as the height of the stairs, the surface at the bottom, and the body position of the girl could have contributed to her not getting hurt.
Step-by-step explanation:
When a girl falls off a long staircase and is not hurt, it can be attributed to several factors:
- Distance: The height of the staircase may not have been significant enough to cause injury. If the stairs were not very high, the impact upon falling may have been minimal.
- Surface: The girl may have landed on a soft surface at the bottom of the stairs, such as carpet or a padded area, which absorbed the impact and prevented injury.
- Body position: If the girl fell in a certain way that distributed the force of impact evenly across her body, it could have reduced the risk of injury.