18.1 seconds
Equation is t = √ (2d/g)
t = time = ?
d = distance = 1 mile = 1609.344 metres
g = acceleration due to gravity = 9.8 metres per second2
t = √ (2d/g)
t = √ (2 x 1609.344 / 9.8)
t = √ (2 x 164.2187755)
t = √ 328.437551
t = 18.1228461
This answer does not include any effects of drag.
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