A man stands on a spring scale in a moving elevator and notices that the scale reading is 20% larger than when he weighs himself in his bathroom. Which statement can not be true?
A)The tension in the supporting cable must exceed the weight of the elevator and its contents.
B)The speed of the elevator changes by equal amounts in equal times.
C)The elevator could be moving upward with increasing speed.
D)The elevator could be moving downward with decreasing speed.
E)The elevator could be moving upward at constant speed.

Question

Quizplus · Accepted Answer

If the elevator is moving upward at constant speed, the scale would read the same as when the man weighs himself in his bathroom. The increased reading indicates acceleration, not constant speed.

A Man Stands on a Spring Scale in a Moving