If there is an object with a density of 0.3 gm/cu.cm in water, how long will it take to go back up to the surface if it was 10 meters deep in the beginning? Or another question would simply be, what would be the object's upward speed in the water? Is it possible to calculate this? Assuming it is pure water at 4°C so its density is 1 g/cu.cm Thanks!!