An Elevator Is Moving Upward with a Speed of 11

Multiple Choice

An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval?

A) 2.0 m/s², upward
B) 2.0 m/s², downward
C) 5.3 m/s², upward
D) 5.3 m/s², downward
E) 2.7 m/s², downward