When can the holistic method and the isolation method be used, and what are the conditions for their use When do several objects have the same acceleration

When can the holistic method and the isolation method be used, and what are the conditions for their use When do several objects have the same acceleration

You can buy some special topics about integral method and isolation method, which are included in Mechanics (1) of Longmen senior high school. The conditions for its use are: when two objects keep relatively static or move at a constant speed, integral method can be used. The order of integral method and isolation method is to isolate the whole first. If you don't know, you can ask me again. I hope it will help you