A small submarine with mass $1000\,\text{kg}$ descends through water at a steady speed of $2.0\,\text{m s}^{-1}$. What resultant force acts on the submarine while it is sinking?
- A$0$
- B$500\,\text{N}$ downwards
- C$2000\,\text{N}$ downwards
- D$9800\,\text{N}$ downwards