A Cessna aircraft has a liftoff speed of 120 km/h.

(a) What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 240 m?

(b) How long does it take the aircraft to become airborne?

The equation for acceleration is the ff:

2ad = V2^2 V1^2

V1 = 0

V2 = 120 km/h = 33.33 m/s

d = 240

inputting into the equation you get 2.31 m / s^2 as the acceleration

for B use another acceleration equation

a = change in V / change in time

2.31 = (33.33 - 0) / (t2 - 0)

t2 = 14.43 seconds