Moving at a Constant Speed, an Elevator Lifts a 1000

Multiple Choice

Moving at a constant speed, an elevator lifts a 1000 N package 10 meters in 3 seconds. During this time, the impulse delivered to the package by the elevator floor is

A) 10,000 Ns up.
B) 3,000 Ns up.
C) 10,000 Nm up.
D) zero.