Question

A feather and a stone are released from the same height in vacuum under gravity which one will reach ground first

Answer 1

The both bodies will fall at the same time ...as because it is an universal law that all objects having the same​ acceleration in a gravitational field will reach the ground at the same time...when no air resistance is present the rate of descent depends on how far the object has fallen no matter how heavy the object is.....this is an example of law of conservation of energy and has been proved experimentally by dropping a feather and a coin in an airless tube

Answer 2

U must be confused that mass of stone is much more than mass of feather.
but I all objects when fall freely are accelerated towards earth with acceleration g.
and moreover time of flight does not depends on the mass of objects it is independent of mass.

So both Will reach ground at same time.