Answer:
To find the acceleration of the airplane at t2 = 4.40 s, we can use the formula:
acceleration = (final velocity - initial velocity) / (final time - initial time)
Using the given positions and times, we can calculate the velocities at t1 and t2:
v1 = (x2 - x1) / (t2 - t1)
v2 = (x3 - x2) / (t3 - t2)
Then, we can calculate the acceleration at t2:
acceleration = (v2 - v1) / (t3 - t1)