Answer:
[tex]-9 m/s^2[/tex]
Explanation:
Acceleration is defined as the ratio between the change in velocity and the time taken for the velocity to change. Mathematically:
[tex]a=\frac{v-u}{t}[/tex]
where
v is the final velocity
u is the initial velocity
t is the time interval
In this problem, we know the following data:
[tex]u=45.0 m/s[/tex] is the initial velocity of the plane
[tex]v=0[/tex] is the final velocity (the plane comes to a stop)
[tex]t=5.00 s[/tex] is the time interval
Substituting into the equation, we find
[tex]a=\frac{0-45}{5}=-9 m/s^2[/tex]
and the negative sign means the acceleration is opposite to the direction of motion of the plane.
