If you are a student, ask your German teacher if they have a spare Lehrerhandbuch you can consult during breaks. Public or university libraries with a language learning section may also carry the full set.
The most reliable way to access these answers is through the official publisher, Klett Sprachen Lehrerhandbuch (Teacher's Manual)
"Das Neue Deutschmobil 2 Arbeitsbuch Antworten Pdf" appears to be a German language learning resource, specifically a workbook with answers in PDF format. Here's a write-up on the topic:
