Please see attachment. Will be happy to receive comments/responses on the doubts raised.
No net acceleration. If the initial state has no movement, it will stay that way.2. If the force appllied by both is same , no net movement results eventhough both will feel the force exeted by the other person.
If they cannot support the same force with their feet or any other part of their body, right.4.At some point , the weaker person is likely to be moved by the push force applied by the strong person.