A metal ball with mass $0.30\text{ kg}$ and weight $3.0\text{ N}$ is kept beneath the oil surface. It is acted on by an upward force of $0.30\text{ N}$. After the ball is released, what is its initial acceleration?
- A$1.0\,\text{m s}^{-2}$
- B$9.0\,\text{m s}^{-2}$
- C$10\,\text{m s}^{-2}$
- D$11\,\text{m s}^{-2}$