Two separate spheres have masses $2.0\,\text{kg}$ and $4.0\,\text{kg}$. They collide and afterwards move away from each other. While the collision takes place, the $2.0\,\text{kg}$ mass has an average acceleration of $8.0\,\text{m s}^{-2}$. What is the average acceleration of the $4.0\,\text{kg}$ mass?
- A$2.0\,\text{m s}^{-2}$
- B$4.0\,\text{m s}^{-2}$
- C$8.0\,\text{m s}^{-2}$
- D$16\,\text{m s}^{-2}$