There's actually a lot of data on the injury potential dropped objects from the construction industry, and its obvious that even what we might consider small objects have big injury potential.

So, assuming the victim is wearing a hard hat, a 249 gram object will likely cause:

- a medical treatment injury when it falls from above approx 18 meters
- a lost time injury when it falls from above approx 25 meters
- a fatality when it falls from above 40 meters

Source: http://www.dropsonline.org/resources...ps-calculator/

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