A 4.0-kg object, A, and a 2.0-kg object, B, are connected with a rope. A force is applied to another rope attached to the 2.0-kg object that pulls both A and B along a horizontal surface. Which of the following statements is true?
a. The force that B exerts on A is greater than the force that A exerts on B.
b. The force that A exerts on B is greater than the force that B exerts on A.
c. The force that B exerts on A is equal to the force that A exerts on B provided that the system slides with uniform motion.
d. The force that B exerts on A is equal to the force that A exerts on B regardless of the motion of the system.
e. The sum of the applied force and the force that B exerts on A is equal to the force that A exerts on B.
D