Question

if we drop a 10lb iron ball and a 1lb aluminum ball from top of a high platform inside a mine them both will reach the floor at the same time. Why​

Answer 1

In real life the one having less volume and more weight will reach first

but in ideal situation where viscosity of air is neglected both will hit ground at same time irrespective of their masses if dropped from the same height

this is because the acceleration produced due to gravity does not depend on the body.