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

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