A Train with a Constant Velocity of +28

Multiple Choice

A train with a constant velocity of +28.6 m/s approaches a small town . The operator applies the brake, reducing the train's velocity to +11.4 m/s. If the average acceleration of the train during braking is -1.35 m/s², for what elapsed time does the operator apply the brake?

A) 8.44 s
B) 12.7 s
C) 3.38 s
D) 5.92 s
E) 10.4 s