An airplane accelerates uniformly from rest on an airport runway with an acceleration of 5/2 m s^-2 and reaches its takeoff speed over a distance of 2000 m. What is the takeoff speed of the airplane in km h^-1?

1. Step: u = 0, a = 2.5 m s^-2, s = 2000 m. 2. Step: v^2 = 0 + 2 * 2.5 * 2000 = 10000 -> v = 100 m s^-1. 3. Step: 100 * 3.6 = 360 km h^-1.