Block A has a mass of 5 kg; block B's mass is 8 kg. They are pushed with a force of magnitude 20 N. What can you say about two forces: force with which A pushes on B force with which B pushes on A A on B is the same as B on A A on B is less than B on A because B is heavier than A A on B is greater than B on A because both move to the right