A solid sphere, with a density lower than that of water, is kept fully submerged in water several metres below the surface. The water has uniform density. The sphere is then released. At once after release, the sphere moves upward. Which row states how the magnitudes of the upthrust on the sphere and the resultant force on the sphere change as it rises?
- Aupthrust on the sphere: constant; resultant force on the sphere: decreasing
- Bupthrust on the sphere: constant; resultant force on the sphere: increasing
- Cupthrust on the sphere: decreasing; resultant force on the sphere: decreasing
- Dupthrust on the sphere: decreasing; resultant force on the sphere: increasing