Upward speed of an object in water

[Yoann]

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!

 

[PeterO]

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!

Objects traveling in water (usually) quickly attain their terminal velocity under the influence of gravity [when sinking] or buoyancy [when floating to the surface].

Just like for objects passing through the air [another fluid] the shape and orientation of the object will affect that terminal velocity.