"The mass of this car is two thousand kilograms."
Translation:Masa tego samochodu to dwa tysiące kilogramów.
Yes, it could be, however this is rather a basic placement test, so let's just assume it isn't. There are other discussions about the use of masa/the mass (in regards to other questions in this test using the words) with several people expressing similar opinions to mine - maybe Duolingo should have a look at that? Also, as a sidenote, I am glad I took the test because it made me realise that probably not all courses on this website are great - Polish doesn't seem great (based on the test) unless you find it essential to be able to express how much something weighs - sorry, got it all wrong - to express the mass of an object...