A person is standing on a scale placed on the floor of an elevator. At time t, the elevator is at rest and the reading on the scale is 500 N. At a later time ty, the person is still standing on the scale and the reading on the scale is 400 N. Based on the scale readings, which of the following statements about the motion of the elevator could be true at time to?
A.
The elevator is moving upward at constant speed
B.
The elevator is moving upward and slowing down.
C.
The elevator is moving downward at constant speed.
D.
The elevator is moving downward and slowing down,
E.
The elevator is at rest.