A ball moves through a liquid at a steady speed. Three forces act on it: an upthrust, a drag force and its weight. The liquid has a uniform density. Which statement is correct?
- AThe drag force increases with increasing depth.
- BThe drag force is equal to the sum of the upthrust and weight.
- CThe upthrust is constant with increasing depth.
- DThe weight is greater than the sum of the drag force and the upthrust.