When a 45-Kg Person Steps on a Scale in an Elevator

Multiple Choice

When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)

A) The elevator is moving downward at a constant rate.
B) The elevator is moving upward at a constant rate.
C) The elevator is accelerating downward at a constant rate.
D) The elevator is accelerating upward at a constant rate.
E) From the given information, we cannot tell if the elevator is moving up or down.