wph probably knows way more about physics than I do but - I believe a heavier object traveling at the same speed as a lighter object has greater momentum. Assuming there were no difference in drag or wind resistance (probably a bad assumption), the heavier object would decelerate more slowly than the lighter object.

wph - agree or no? I know there is a lot more complexity that could be brought into it, but that's as much as I remember from high school physics long ago.