3 ms·
The bullet, falling from the same height as a crashing drone, is at least as lethal if it strikes a human. There is no "safe weight" for a falling object... bu
by hashkb 8y ago
The bullet, falling from the same height as a crashing drone, is at least as lethal if it strikes a human. There is no "safe weight" for a falling object... but there may be a "safe momentum".
- ricardobeat 8y agoThe proposed flying zone for drones like these is between 60-120m height. Seems like a bullet must travel at least 62m/s to penetrate human skin [1], for which you need a height of at least ~200m [2]. So even dropping a bullet from one the delivery drones would not carry a high risk of fatal injuries. That, and P=MV, momentum/energy increases proportionally to mass. A 'safe weight' can be defined if the altitude is known. [1] https://slate.com/news-and-politics/2011/03/can-falling-bullets-kill-you.html https://slate.com/news-and-politics/2011/03/can-falling-bull... [2] https://www.grc.nasa.gov/www/k-12/airplane/mofall.html https://www.grc.nasa.gov/www/k-12/airplane/mofall.html