This is the 5348th most frequent Arabic word.
جديد
New.
Here, 'جديدة' is an adjective describing the vehicle ('سيارة'), indicating something that is newly made or acquired.
اشترينا سيارة جديدة عند زيارة المعرض.
We bought a new car during the showroom visit.
In this sentence, 'جديدًا' is used as an adjective modifying 'مشروعًا', referring to a fresh or restarted endeavor.
بدأت مشروعًا جديدًا هذا الأسبوع.
I started a new project this week.
'جديدًا' here acts as a descriptive term for the book ('الكتاب'), suggesting it is in a fresh and unused condition.