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How long does it take on average for a human body accelerate to 78 mph in freefall?
Convert 78 mph to meters per second:
78 mph=35 meters/second
The acceleration of earths gravity is 9.8 meters per second squared. This is constant. Therefore, using basic calculus, the velocity of a falling object is equal to 9.8 meters per second times the time it has fallen.
9.8*T=35
T=3.6
Thus, it takes roughly three and a half seconds for the average human body to accelerate to 78 miles per hour (assuming wind drag is inconsequential).
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