When a 45-kg person steps on a scale in an elevator, the scale reads a steady 410 N. Which of the following statements must be true? (There could be more than one correct choice.)
A) The elevator is accelerating downward at a constant rate.
B) The elevator is moving downward at a constant rate.
C) The elevator is accelerating upward at a constant rate.
D) The elevator is moving upward at a constant rate.
E) From the given information, we cannot tell if the elevator is moving up or down.

Question

Quizplus · Accepted Answer

The scale reading is less than the person's weight, so the elevator must be accelerating downward or moving downward at a constant rate. We cannot tell from the given information whether the elevator is accelerating or moving at a constant rate.

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