Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 13

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. AThe sphere always moves with constant acceleration.
2. BThe sphere always moves with constant velocity.
3. CThe upthrust on the sphere always decreases.
4. DThe upthrust on the sphere is always constant.

As printed in the paper