A Landing Airplane Makes Contact with the Runway with a Speed

Multiple Choice

A landing airplane makes contact with the runway with a speed of 75.0 m/s and moves toward the south. After 18.5 seconds, the airplane comes to rest. What is the average acceleration of the airplane during the landing?

A) 2.11 m/s², north
B) 2.11 m/s², south
C) 4.05 m/s², north
D) 4.05 m/s², south
E) 14.3 m/s², north