Two spheres of same size, one of mass 2 ~kg and another of mass 4...

Two spheres of same size, one of mass $2 \mathrm{~kg}$ and another of mass $4 \mathrm{~kg}$ are dropped simultaneously from the top of Qutab Minar (height $\approx 72 \mathrm{~m}$ ). When they are $1 \mathrm{~m}$ above the ground the two spheres have the same