Answer
See work.
Work Step by Step
The 20-kg stone feels a greater pull due to gravity than the 10-kg stone. The pull is twice as great.
Because the 20-kg mass has twice the inertia as the 10-kg mass, and F = ma, each of the masses has the same downward acceleration in freefall, because a = F/m. Twice the force and twice the mass means that the acceleration is the same.
