Answer

a) Use v² = u² + 2as (1) a = v² / 2s = (60m s ^-1)² / 2 x 1500m (1) = 1.2 m s ^-1 (1)

b) F = ma (1) = 70,000 kg x 1.2 m s^-2 (1) = 84 kN (1)

c) As the aircraft gains speed the size of the resistive forces increases (1). This causes the resultant force to decrease (1)