A father, mass 80 kg, and his son, mass 40 kg, are standing on a frozen, frictionless pond. That means there is no friction. None! They are a distance apart and they are each holding onto a rope and starting a tug of war. They both pull with a constant nonzero force. Which of the following best describes the motion of the boy? A) Constant speed.
B) Constant velocity.
C) Constant acceleration.
D) They remain at rest.