An aircraft has a total mass, including fuel and passengers, of 70 000 kg.
Its take-off speed is 60 m s–1 and it needs to reach that speed before the end of the runway, which is 1500 m long.
(a) Calculate the minimum acceleration of the aircraft. [3]
(b) Calculate the average force needed to achieve this acceleration. [3]
(c) Explain how the resultant force on the aircraft is likely to change during take-off. [2]
