Physics
Two stones of different masses are dropped simultaneously from the top of a building

Both the stones reach the ground at the same time
Depends on the composition of the stone
Larger stone reaches the ground earlier
Smaller stone reaches the ground earlier

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 0°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water
Density of the substance to the density of water at 4°C

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