Question

An airplane starts from rest and accelerates at a constant rate of 3.0 m/s^2 for 30.0 s before leaving the ground.

Answer 1

90m/s

Step-by-step explanation:

acceleration depicts the rate of change in velocity per time, therefore an acceleration of 3m/s² means the object increases its velocity 3m/s every second therefore the second squared in the denominator

acceleration = (3m/s)/1s =3m/s²

Therefore, if the plane starts from rest (initial speed = 0m/s) and it increases 3m/s every second for 30 seconds you would have:

final_speed = initial_speed + 3m/s²*30s =0+3*30 m*s/s² = 90 m/s