At a fairground, a visitor hurls a soft object with mass $0.12\,\text{kg}$ towards a coconut with mass $0.48\,\text{kg}$. The soft object comes to rest on impact with the coconut. To knock the coconut loose, it has to be set in motion at $0.10\,\text{m s}^{-1}$. What is the least speed at which the visitor must throw the soft object so that the coconut is dislodged?
- A$0.20\,\text{m s}^{-1}$
- B$0.40\,\text{m s}^{-1}$
- C$2.0\,\text{m s}^{-1}$
- D$4.0\,\text{m s}^{-1}$