Imagine an experiment in which a 16lb bowling ball and a 10lb bowling ball are dropped from the fifth floor at the same time The heavier ball will reach the ground first?

Answer 1

No. They will hit the ground at the same time. The inertia for the heavier ball will be greater, but the acceleration for both will be the same, and both would (if the air resistance is the same for both) hit at the same time.