Question

9.A certain aircraft has a liftoff speed of 129 km/h.(a) What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 234 m?

 m/s²

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

 s

Answer 1

Given:

$v=129\:\rm km/h=35.8\: m/s$

$d=234\:\rm m$

(a)

$$a=\frac{v^2}{2d}=\frac{35.8^2}{2*234}=2.74\:\rm m/s^2$$

(b)

$$t=\frac{v}{a}=\frac{35.8}{2.74}=13.0\:\rm s$$