A 50-kg person stands on a bathroom scale inside of an elevator. The scale reads 400 N. Which of the following could describe how the elevator is moving?
a. The elevator is moving up while decreasing speed at a rate of 2 s2m.
b. The elevator is moving up while increasing speed at a rate of 2 s2m.
c. The elevator is moving up at a constant speed of 2 sm.
d. The elevator is moving down while decreasing speed at a rate of 2 s2m.
e. The elevator is moving down at a constant speed of 2 sm.