Mass comparison

Two spherical bodies of same radius but different densities fall from such a height that both fall with uniform velocities. If the velocity of the body with density 7800 7800 kg.m 3 ^{-3} moves three times faster than the other, then find the density of the second body in S. I. units. (Density of air is 1.293 1.293 kg.m 3 ^{-3} ).


The answer is 867.816.

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