Question

An aircraft on its take-off run has a steady acceleration of 3 m / s2. What velocity does the aircraft gain in 4 s? If the aircraft passes one post on the runway at a velocity of 20 m / s, what is its velocity 8s later?

Answer 1

3*4=12m/s answer for your first question

20+(3*8)=44 answer for second question

Answer 2

Acceleration of the aircraft = 3m/s²

.a) the velocity the aircraft gain in 4 seconds=
                 3 x 4 (acceleration x time ) = 12 m/s
b) Velocity = 20 m/s
velocity 8 second=
             20+(8 x 3) = 44 m/s