Because no mass or force is given for this equation, we'll use a simplified formula for acceleration:
[tex] a = \frac{v_2 - v_1}{t} [/tex]
v1 is the initial velocity. v2 is the final velocity. t is the amount of seconds that elapse.
The airplane starts at rest, or at 0 m/s. In 9 seconds, the airplane reaches a speed of 45 m/s. Plug these values into the formula:
[tex] \frac{45 - 0}{9} = \frac{45}{9} = \boxed{5} [/tex]
The airplane's acceleration is 5 meters per second squared.
