Two bodies A and B of masses 5 kg and 10 kg in contact with each other rest on a table against a ri

Two bodies A and B of masses 5 kg and 10 kg in contact with
each other rest on a table against a rigid wall (Fig. 5.21). The
coefficient of friction between the bodies and the table is
0.15. A force of 200 N is applied horizontally to A. What are
(a) the reaction of the partition (b) the action-reaction forces
between A and B ? What happens when the wall is removed?
Does the answer to (b) change, when the bodies are in motion?
Ignore the difference between μs and μ