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.

Question

Quizplus · Accepted Answer

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

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