R = .1639 V^2
R = .1639 * 215^2
when an aircraft takes off, it accelerates until it reaches its takeoff speed V.In doing so it uses up a distance R of the runway, where R is proportional to the square of the of the takeoff speed. If V is measured in miles per hour and R is measured in feet, then 0.1639 is the constant of proportionality. If an aircraft has a takeoff speed of about 215 miles per hour, how much runway does it need?
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