A brick with weight $20\,\text{N}$ is stationary on an inclined plane. Its weight has a $10\,\text{N}$ component acting parallel to the plane. The brick is also acted on by a frictional force of $4\,\text{N}$. What is the acceleration of the brick down the plane? Take the acceleration of free fall $g$ to be equal to $10\,\text{m s}^{-2}$.
- A$0.3\,\text{m s}^{-2}$
- B$0.8\,\text{m s}^{-2}$
- C$3.0\,\text{m s}^{-2}$
- D$8.0\,\text{m s}^{-2}$