The plane passed the runway in 20 seconds and at the moment of liftoff from the ground had a speed

The plane passed the runway in 20 seconds and at the moment of liftoff from the ground had a speed of 120 m / s. With what acceleration did he move along the runway and how long is it?

These tasks: t (duration of the runway passage) = 20 s; V (speed at the moment of separation from the ground) = 120 m / s.

1) Acceleration with which the given plane was moving: a = (V – V0) / t = (120 – 0) / 20 = 6 m / s2.

2) The length of the runway used: S = (V + V0) * t / 2 = (120 + 0) * 20/2 = 1200 m.

Check: S = V0 * t + a * t ^ 2/2 = 0 * 20 + 6 * 20 ^ 2/2 = 1200 m (correct).

Answer: The plane was moving with an acceleration of 6 m / s2 along a runway length of 1200 m.