A plane decelerates at a constant rate of 3.9 m/s [W]. If the plane's initial velocity was 24 m/s [E], how long does it take for the
plane to come to a complete stop?

t = 6.15 [s]

Explanation:

To solve this problem we must use the following equation of kinematics.

where:

Vf = final velocity = 0 (the plane comes to stop)

Vo = initial velocity = 24 [m/s]

a = desacceleration = 3.9 [m/s²]

t = time [s]

Note: The negative sign of the acceleration means that the plane is decreasing its velocity.

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure