An airport has runways only 184 m long. A

Question

small plane must reach a ground speed of
40 m/s before it can become airborne.
What average acceleration must the plane’s
engines provide if it is to take off safely from
its airport?
Answer in units of m/s2

Answer 1

with the plane starting from rest and a uniform acceleration, the average velocity is 20 m/s

so the time of acceleration is 184/20 or 9.2 s

the acceleration is (40 m/s) / 9.2 s