A submarine with a total mass of $3200\,\text{kg}$ is stationary beneath the water. Its total mass is then reduced by $200\,\text{kg}$, as water is pumped out horizontally from the submarine in a negligible time. The upthrust on the submarine remains the same. Because the total weight of the submarine changes, it accelerates vertically upwards. What is the submarine's initial upwards acceleration?
- A$0.613\,\text{m s}^{-2}$
- B$0.654\,\text{m s}^{-2}$
- C$9.81\,\text{m s}^{-2}$
- D$10.5\,\text{m s}^{-2}$