• The entire time.
  • Depends: If solid spheres made of the same material, (which was denser than water), were dropped into the ocean, larger ones will reach the bottom before smaller spheres because the mass of a solid sphere is proportional to the cube of it's radius whereas the (hydrodynamic) drag is proportional to the cross-section which is proportional to the square of the radius. i.e. as the radii of the spheres increases their mass/weight/downward-force, (∝r3), increases faster than the corresponding (hydrodynamic) drag force opposing their fall (∝r2).

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