A rigid sphere is held at rest on the sea bed. When the sphere is released, it rises to the surface of the sea. The seawater has a uniform density.
Which statement about the sphere, from its release until it reaches the surface, is correct?
1 )
The sphere always moves with constant acceleration.
2 )
The sphere always moves with constant velocity.
3 )
The upthrust on the sphere always decreases.
The upthrust on the sphere is always constant.
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