As shown below, Lily is using the rope through a fixed pulley to move a box with constant speed v. The kinetic friction coefficient between the box and the ground is \mu<1; assume that the fixed pulley is massless and there is no friction between the rope and the fixed pulley. Then, while the box is moving, which of the following statements is correct?
Answer Choices
A. The magnitude of the force on the rope is constant.
B. The magnitude of friction between the ground and the box is decreasing.
C. The magnitude of the normal force of the ground on the box is increasing.
D. The pressure of the box on the ground is increasing.
E. The pressure of the box on the ground is constant.
