Since the WTC...
Posted on: June 16, 2012 at 13:16:31 CT
was at sea level, in Earth’s atmosphere, you might be able to imagine how much air resistance that represents. (Think about putting your arm out the window of a car moving half that fast!) Most free-falling objects would reach their terminal velocity long before they reached 200 mph. For example, the commonly-accepted terminal velocity of a free-falling human is around 120 mph. The terminal velocity of a free-falling cat is around 60 mph.
Therefore, air resistance alone will make it take longer than 10 seconds for gravity to pull an object to the ground from the towers’ former height.